Bài 2: Viết và gọi tên các đồng phân ứng với công thức phân tử C 8 H 10. Đây cũng là 2 hiđrocacbon thơm đứng đầu ( không tính benzen số 1) trong dãy đồng đẳng. Most people can begin to smell benzene in air at approximately 60 parts of benzene per million parts of air (ppm) and recognize it as benzene at 100 ppm. Similarly, you might name a compound 3,4,9-trimethyldecane or 2,7,8-trimethyldecane. Table 2. ) Enter the desired X axis range (e. In organic chemistry, xylene or xylol (from Greek ξύλον (xylon) 'wood'; [1] [2] IUPAC name: dimethylbenzene) are any of three organic compounds with the formula (CH3)2C6H4. Supply Chain Insights LLC – Supply Chain Planning Software Study (May-July 2018) “The less time you need to create and understand your plan, the more time you can spend on the real value drivers. The second name has the lowest sum of numbers, so that is the correct name. 652-1. Benzene (C 6 H 6, CAS number 71-43-2) is an aromatic hydrocarbon widely used as a solvent in chemical laboratories and as an intermediate in the chemical industry for manufacturing of polymers and other products [ 1 ]. CI 이 OMP 구 10. 26ppmであり、種々の官能基を有するベンゼン環の化学シフト値は6-9ppm付近になります（芳香族領域）。. The improved activity of fluorine-containing OMP compounds ( 1g - k ), except 1i , suggests that increased lipophilicity might cause better transportation of inhibitors into the Unlike alpi organics, company of benzene-derived compounds can will confusing because a single aromatic compound can have multiple possible names (such as common and systematic names) to … 15. Unlike aliphatic bio, nomenclature of benzene-derived joining can be confusing because a single aromatic compound can have multiple possible names (such as common or systematic names) be … Unlike aliphatic organics, appellation of benzene-derived compounds can be confusing because a single aromatic compound canister have multiple likely Benzene. You should memorize the structures and formulas shown in Figure 16. . Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing C-13 NMR spectra. Mono-substituted benzene rings, with a substituent not on the list above, are named with benzene being the parent name. Lời giải: 4 đồng phân hiđrocacbon thơm của C 8 H 10 là: Quảng cáo. Ortho-, Meta-, Para- (OMP) Nomenclature for Disubstituted Benzenes. This can be done by removing one of the benzene molecules editing the coordinates in the input. The more the resonance structures, the more easily we can delocalise the charge within a benzene ring. SummaryBenzene is found in the air from emissions from burning coal and oil, gasoline service stations, and motor vehicle. The sum of the numbers in the first name (16) is less than the sum of the numbers in the second name Solution: The molecular orbital picture of benzene shows that in it all the six carbon atoms are sp 2 hybridised. Isotopologues: Benzene-D6. Ambient air quality - Standard method for measurement of benzene concentrations - Part 2: Pumped sampling followed by solvent desorption and gas chromatography. 1 15. 1: Two ways of representing a phenyl group. CAS Common Chemistry is provided under the Creative Commons CC BY-NC 4. #OMP50 Episode 10: OMP is getting bigger and bigger. Dec 28, 2022 · In addition to simple benzene naming and OMP nomenclature, benzene derivtives are also sometimes used as the "parent" in the name of a larger compound. I want to annotate a strain that is resistant to Benzalkonium, which is a child of Benzene Nov 12, 2019 · Inventory management - Cycle. 2160 Wommelgem (Antwerp) Belgium. 3: Nomenclature of Benzene Derivatives - Chemistry LibreTexts - IUPAC NOMENCLATURE RULES-IUPAC NAME-ORGANIC The word "benzene" derives from "gum benzoin" (benzoin resin), an aromatic resin known since ancient times in Southeast Asia, and later to European pharmacists and perfumers in the 16th century via trade routes. Quickly confirm chemical names, CAS Registry Numbers®, structures or basic physical properties by searching compounds of Feb 18, 2015 · 1. OMPHOBBY M7 RC Helicopter. Leader in racing, kart & rally accessories and racing technical wear. Benzene. Figure 16. Note that the usual 1/2 factor is not included in the K values. +32 3 650 22 11. US$ 899. Hydroxylation of benzene over PMoV1@OMP, PMoV2@OMP, and H5PMo10V2O40 with fixed active sites. Catechol ( / ˈkætɪtʃɒl / or / ˈkætɪkɒl / ), also known as pyrocatechol or 1,2-dihydroxybenzene, is an organic compound with the molecular formula C6H4(OH)2. This reaction is reversible and can be used to control the reactivity and solubility of benzene derivatives. 184225) for synthesis of 4-fluorocyclohexa-2,5-dienones. 1: K: AVG: N/A: Average of 147 out of 183 values; Individual data points Quantity Value Units Method Reference Comment; T fus: 278. Ortho? 1 from substituent Jul 23, 1999 · H 2 omp (omp=2,3,7,8,12,13,17,18-octamethoxyporphyrin dianion) (see Fig. Sheng Xia Road 169. Ortho-, Meta-, Para- (OMP) Nomenclature for Disubstituted Benzenes . Các đồng phân hidrocacbon thơm In addition to simple benzene naming and OMP nomenclature, benzene derived compounds are also sometimes used as bases. OMP. HCHIPOLACY ng A. It is highly toxic and is a known carcinogen; exposure to it may cause leukemia. Instead of using numbers to indicate substituents on a benzene ring, ortho- (o-), meta- (m-), or para (p-) can be used in place of positional markers when there are . 1. Benzene isomer takes the strain S- tr y alk - eactiv intermediat g ; wever, orr 1,2,3-cyclohex, tr , relativ explor v omp e ar uggest egiose-lec ov b t erac, reac pr-distor erac OMP is the new Official Racewear Supplier of Team Penske. 2 15. Label the molecule shown to the right with 3 different names: CH3 CH3 58. two. xhaust. 1: Each carbon in the benzene ring is sp2 hybrized with a p orbital perpendicular to the ring plane (Left) Being planar and cyclic allows benzene's p orbitals to undergo cyclic overlap (Right) For this to happen, of course, the ring must be planar – otherwise the p orbitals couldn’t overlap properly and benzene is known Challenge: A benzene ring with two methyl groups attached to it is known by the non-systematic name as xylene. TiO2 photocatalysis, a technology that has been continuously drawing attention, can potentially benefit from LEDs to become a sustainable alternative for the abatement of organic micropollutants (OMPs). Muramatsu, K. Với hóa 11 benzen thì chủ yếu học sinh sẽ gặp 2 đồng đẳng của benzen là C7H8 ( Toluen ) và C8H10. 2. 328. Its powerful engines, embedded data science, and autonomous planning capabilities empower you to act fast with confidence. Deleted or Replaced CAS Registry Numbers. Xylene. Some of these mono-substituted compounds (labeled in red and green), such as phenol or toluene, can be used in place of benzene for the chemical's base name. com Used for the direct α-hydroxylation of ketones under acidic conditions. The chlorine atom is considered a branch CAS Registry Number: 71-43-2. of benzene Jan 29, 2018 · In one pattern, ortho- and para – products dominate, and the meta- product is an extremely minor byproduct. (1) US$ 529. 1. Mr. In addition to simple benzene naming and OMP nomenclature, benzene derived compounds are also sometimes used as bases. The naming process for 2-chlorophenol (o-chlorophenol). In practice, 1,3-cyclohexadiene is slightly more stable than expected, by about 2 kcal, presumably due to conjugation of the double bonds. Nomenclature of benzyl group based compounds are very Quantity Value Units Method Reference Comment; T boil: 353. Dec 27, 2021 · If the alkyl substituent is smaller than the benzene ring (six or fewer carbons), the compound is named as an alkyl-substituted benzene following the rules listed above. 50717-45-8. These compounds contain ring structures and exhibit bonding that must be described using the resonance hybrid concept of valence bond theory or the delocalization concept of molecular orbital theory. Official OMP Racing USA WebSite. また、ベンゼン環についているHの化学シフト値 Benzene, C 6 H 6, is an organic aromatic compound with many interesting properties. Oct 14, 2020 · The development of ultraviolet light-emitting diodes (UV-LED) opens new possibilities for water treatment and photoreactor design. Answer to Solved 58-60. They are defined as the following: • ortho Base Get Nomenclature. , 100, 200) 2. 05 g) (or PMoV2@OMP 0. Instead of using numbers to indicate substituents on a benzene ring ortho- o- meta- m- or para p- can be used in place of positional markers when there are two substituents on the benzene ring disubstituted benzenes. substituents on the benzene ring (disubstituted benzenes). We offer much more than just software. Therefore, it is important to pay attention to the meta-position in the NMR (Nuclear Magnetic Resonance) of the benzene ring. ”. View Solution. Building 1 - Room 901. Those adjacent are o=ortho, then m=meta, with the remote position being designated p=para Those adjacent are o=ortho, then m=meta, with the remote position being designated p=para Jul 1, 2022 · OMP-10 (1j), OMP-13 (1k), and OMP-14 (1l), which have a fluoro group at the p-, o-, and m-positions on the benzene ring, respectively, showed better activity than RR6. Below is a list of commonly seen benzene-derived compounds. Recently reported data on photocatalytic degradation of OMPs Nov 20, 2000 · Benzene is an important pollutant with carcinogenic potential. for benzene, toluene, ethylbenzene and o,m,p-xylene were established by extraction after adding 20, 50, 100, 250, 500, 1000 and 2500 µg of each standards and 400 µg of internal A mild, convenient and transition metal free methodology for oxidative ipso nitration of diversely functionalized organoboronic acids, including heteroaryl- and alkylboronic acids, has been developed at ambient temperature using a combination of [bis-(trifluoroacetoxy)]iodobenzene (PIFA) – N-bromosuccinimide Dec 30, 2019 · A compound containing a benzene ring which has one or more alkyl substituents is called an arene. The reaction between benzene and bromine in the presence of either aluminum bromide or iron gives bromobenzene. 461: Eon, Pommier, et al. We would like to show you a description here but the site won’t allow us. Examples of ortho-, para – directors are hydroxyl groups, ethers, amines, alkyl groups, thiols, and halogens. Volatile Organic Compounds (VOC´s): 2-chloro-1,3-butadiene, cis-1,2-Dichloroethene, trans-1,2-Dichloroethene, 2,2 Study with Quizlet and memorize flashcards containing terms like Characteristics of Aromatics, Monosubstituted Benzenes, Benzene as the Substituent and more. Out of these three sp2 hybrid orbitals of each C atom, two orbitals overlap with sp2 hybrid orbitals of adjacent C atoms to form six C - C single bonds. 4 to 373. Lett. Jan 23, 2023 · The sulfonation of benzene is an electrophilic substitution reaction that introduces a sulfonic acid group to the aromatic ring. 4 Subordinate Groups. 64 ± 0. By using CAS Common Chemistry, you agree to the terms and conditions of this license. 2. Mar 27, 2022 · Đó là lý do trong hóa học, benzen còn được gọi là vòng benzen. OMP Aftermarket - Experts in designing and manufacturing water pumps Benzene has 6 molecular π orbitals. To obtain the energy of the monomer, geometry optimization is in principle necessary, although the geometry of a benzene monomer must be close to the one in the dimer. The opls dihedral style uses the potential. Benzene is highly flammable. Substituents which lead to this result are called, “ ortho-, para- directors”. Those adjacent are o=ortho, then m=meta, with the remote position being designated p=para Those adjacent are o=ortho, then m=meta, with the remote position being designated p=para p-Xylene ( para-xylene) is an aromatic hydrocarbon. H 2 omp and rhodium trichloride hydrate were refluxed in benzonitrile under nitrogen for 2 h to give 30% yield. OMPHOBBY M4 MAX RC Helicopter. Benzene, and methylbenzene (toluene) are produced primarily in this way. We combine cutting-edge technology with expert advice based on in-depth knowledge of your industry. Challenge: A benzene ring with two methyl | Chegg. Mar 21, 2019 · Especially, the H5PM10V2O40-based OMP exhibited good activity (33% conversion and 100% selectivity) and stability (reused in five runs) for the hydroxylation of benzene to phenol. 5. Jan 26, 2023 · Study with Quizlet and memorize flashcards containing terms like multiple OH groups, unsaturated, example of unsaturated and more. This is called meta-coupling, and when the meta-position of the benzene ring contains a hydrogen atom, the J-value is usually between 1 and 3 Hz. Recognized by Gartner as a leader in supply chain planning, we consistently deliver Mar 7, 2023 · ผู้นำด้านธุรกิจปิโตรเคมีและเคมีภัณฑ์ | PTT Global Chemical If the alkyl substituent is smaller than the benzene ring (six or fewer carbons), the compound is named as an alkyl-substituted benzene following the rules listed above. Ortho- Meta- Para- OMP Nomenclature for Disubstituted Benzenes. 03 g, H5PMo10V2O40 0. They are derived from the substitution of two hydrogen atoms with methyl groups in a benzene ring In addition to simple benzene naming and OMP nomenclature, benzene derivtives are also sometimes used as the "parent" in the name of a larger compound. Instead of using numbers to indicate substituents on a benzene ring, ortho- (o-), meta- (m-), or para (p-) can be used in place of positional markers when there are two substituents on the benzene ring (disubstituted benzenes). C6H6 + Br2 → C6H5Br + HBr (4) (4) C 6 H 6 + B r 2 → C 6 H 5 B r + H B r. Introduction. The benzyl group (abbv. Provide the non-systematic name (employing toluene) I do not uit this home! 59. 0 license. Shop now! Temperature (K) A B C Reference Comment; 333. Virtual Classroom. 08 Aug 20, 2021 · In addition to simple benzene naming and OMP nomenclature, benzene derivtives are also sometimes used as the "parent" in the name of a larger compound. Figure 15. VAT BE 0428. For one C − C π bond, BO = 3 / 6 = 0. Except sampling Benzene. 2: Common Names for Mono-Substituted Benzenes. π BO = ½ (B – A) = ½ (6 – 0) = 3. , 1971: Coefficents calculated by NIST from author's data. Compared to the ortho position, the J-value is lower due to the distance Occupational Maternity Pay (OMP) is an optional extra payment that you can make to your employees when they are on maternity leave. To add the suffix, the last letter “e” will be dropped, so the parent name is “hexeneoicacid”. 1 2 0 0 1 0 0 0 8 0 0 6 0 0 4 0 0 2 0 0 0 H 5 P M o 1 0 V 2 O 4 0 I Meta represents a 1,3 relationship, or groups that are separated by one carbon on the benzene ring. Aug 8, 2021 · the serial code (no openmp ) runs in 79 ms. Chemical structure: This structure is also available as a 2d Mol file or as a computed 3d SD file The 3d structure may be viewed using Java or Javascript . OMPHOBBY Quick-drying T-shirts Brand customization. Note that 2-chlorophenol = o-chlorophenol. Nakano, Org. This dihedral potential is used in the OPLS force field and is described in (Watkins). The concept of a base is similar to the nomenclature of aliphatic and cyclic compounds, where the parent for the organic compound is used as a base (a name for its chemical name. Ortho and Para have 4 resonance structures while meta has only 3 resonance structures. For example, phenol (C 6 H 5 OH) is the parent name of the compound below because hydroxyl groups have higher nomenclature priority than halides. Unlike aliphatic (straight chain carbons) or other cyclic organic compounds, the structure of benzene (3 conjugated π bonds) allows benzene and its derived products to be useful in fields such as health, laboratory, and other applications such as rubber synthesis. edited Oct 14, 2013 at 15:28. Koralenhoeve 23. The remaining sp 2 orbital of each C atom overlaps with s -orbital of each Benzene, also known as benzol, is a colorless liquid with a sweet odor. The chlorine atom is considered a branch Dec 1, 2021 · Benzene, a known cancer-causing chemical, was found in over half of 108 batches of antiperspirant and deodorant body sprays from 30 different brands, according to a citizen’s petition filed this Jul 22, 2019 · ベンゼン環のNMR: 官能基による化学シフト値の変化. (the machine has hw concurrency of 8) the code links to libgomp. ) Check here for automatic Y scaling 3. The chlorine atom is considered a branch Aug 21, 2020 · The provided dimer geometry is optimized already. For example, you might name a compound as 3,9-dimethyldecane or 2,8-dimethyldecane. Of these, three are bonding and three are anti-bonding. 72583: 1660. The main sources of benzene exposure include its unabated industrial use, gasoline vapors, emissions from engines and tobacco smoke OM PARTNERS NV. This means we can delocalise charge easily in ortho and para which also Two groups on OPPOSITE SIDES in a BENZENE RING *("OMPa loOMPa" -> OMP) Physical Properties of Alcohols. name. That leaves us more room and time to prepare decisions for senior management. OMPHOBBY 60” 74” 106” Edge 540 Kevlar Reinforced Balsa 3D Airplane. Nomenclature of Mono-Substituted Benzenes Unlike aliphatic organics, nomenclature of benzene-derived compounds can be confusing because a single aromatic compound can have multiple possible names (such as common and systematic names) be associated with its structure. Aug 16, 2017 · En este video se explica de manera rápida y súper fácil cómo estructurar la fórmula del benceno común, utilizando los prefijos de orto, meta y para, con ayud Interpreting the c arbon-13 13C C13 NMR spectrum of benzene. Occurrence/Use. Other names: [6]Annulene; Benzol; Benzole; Coal naphtha; Cyclohexatriene; Phenyl hydride; Pyrobenzol; Pyrobenzole; Benzolene Ortho-, Meta-, Para- (OMP) Nomenclature for Disubstituted Benzenes. Q 5. Additive in gasoline, solvent, oil extraction, photogravure printing, veterinary medicine (disinfectant); production of detergents, explosives, pharmaceuticals, and dyestuffs; chemical intermediate in production of ethylbenzene (styrene), cumene, cyclohexane; component of combustion emissions and tobacco smoke. Bài 3: Viết công thức cấu tạo và gọi tên các đồng phân hiđrocacbon thơm có công thức phân tử C 9 H 12. It is a common contaminant in the atmosphere. The six π electrons go into the three bonding orbitals. This training teaches consultants and end users about the inventory optimization process, consisting of input data analysis, product classification, multi-echelon optimization, simulation and the realization of the inventory policy, using OMP. Employ the R-OMP system of naming (o-xylene, mexylene, on pakylene) 0- benzene 60. 先ほども記載した通り、ベンゼンの化学シフト値は7. [16] An acidicmaterial was derived from benzoin by sublimation, and named "flowers of benzoin", or benzoic acid. Nomenclature of benzyl group based compounds are very Aug 20, 2022 · English: Chemical diagram showing how the positions in a benzene ring are named relative to the group X. It is one of the three isomers of dimethylbenzene known collectively as xylenes. nee 1010, NON 1. 442. The p- stands for para-, indicating that the two methyl groups in p -xylene occupy the diametrically opposite substituent positions 1 and 4. g. Benzene evaporates into air very quickly and dissolves slightly in water. US$ 19. More info. The concept of a base is similar to one nomenclature of aliphatic and cyclic compounds, wherever of parent for the organic compound the second as a base (a name for hers chemical name. Race and Drivers our partners. 5: 4. RPR Antwerp District Antwerp. It is the ortho isomer of the three isomeric benzenediols. This colorless compound occurs naturally in trace amounts. 3 ± 0. If I omit the for and use #pragma omp parallel, the runtime shoots up to 179ms, which is slower than serial code. Also employed as a p-fluorination reagent of 4-alkylphenols in the presence of HF·pyridine (cat. Higher MELTING & BOILING POINTS (due to hydrogen bonding) Sep 1, 2021 · The same procedure was used to calculate the PAC demand for 80% OMP removal (OMP-PAC80%), as 80% OMP removal of micropollutants is an often-applied elimination target (Swiss Confederation, 2016). Zhang Dong Road 1658. 015 g), 80 °C, 8 h. #OMP50 Episode 9: The creation of Racing Force Group. Benzene (C 6 H 6) UNE-EN14662-2:2006. The three xylene isomers: o -xylene, m -xylene, and p -xylene. +86 21 6110 1373. The solubility of (omp)RhCl was very good in most organic solvents. For a single C − C bond in benzene, the total BO = σ + π = 1 View Solution. Jan 15, 2023 · It is very important to be able to identify these structures as they will be utilized in the nomenclature of more complex compounds. 3. OG Foto ANO For example, you might name a compound as 3,9-dimethyldecane or 2,8-dimethyldecane. This is the π bond order for 6 C − C bonds. ) Press here to zoom Question: Select the best answer for the synthesis of amide 1 from benzene and trifluoro-methylbenzene and any other organic or inorganic reagents necessary . SHO I ly THO 2000 AICO, e you to OM! w Oost One DU COLADI, Pobre M 3100 4MOHO BP COND 73HNOVO SOHO BRO inte Foot OF LIN. Para represents a 1,4 relationship, or groups that are opposite each other on the benzene ring. Learn the facts and the mechanism of this reaction from Chemistry LibreTexts, a free and open online resource for chemistry education. We determine the stability here by counting the number of resonance structures. To be able to disregard any initial concentration differences of the competitor adsorbates, these two parameters were normalized for the initial OMP China. We will go through several examples for more details about the naming rules. Here’s a concrete example: the For Zoom; 1. A phenyl group consists of a benzene ring with one of its hydrogens removed. The following coefficients must be defined for each dihedral type via the dihedral_coeff command as in the example above, or in the data file or Figure 15. It is a family tradition, founded in 1966 and now in its third generation, that looks to the future with a particular focus on sustainability and solid industrial processes and personal relationships. 00. It’s sometimes called contractual maternity pay or enhanced maternity pay, and allows you to pay your employees more than just the legally mandated minimum when they take time off to have a baby. 1 16. This sort of stability enhancement is called aromaticity and molecules with aromaticity are called aromatic compounds. 99. A group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group principally to the o- and p-positions is. OMP is a world leader in the design and production of water and oil pumps. or: ORTHO-, META-, PARA- (OMP) NOMENCLATURE FOR DISUBSTITUTED BENZENES Instead of using numbers to indicate substituents on a benzene ring, ortho- (o-), meta- (m-), or para (p-) can be used in place of positional markers when there are two substituents on the benzene ring (disubstituted benzenes). 上海市浦东新区盛夏路169号1幢9层901室. Jul 4, 2024 · benzene (C6H6), simplest organic, aromatic hydrocarbon and parent compound of numerous important aromatic compounds. Contact us. the "parallel for" code runs in 29 ms. Bn), similar to the phenyl group and can be written as C 6 H 5 CH 2 -R, PhCH 2 -R, or Bn-R. A further reaction with grignard reagents or amides affords the corresponding isochroman derivatives. Benzene, C 6 H 6, is the simplest member of a large family of hydrocarbons, called aromatic hydrocarbons. Acute (short-term) inhalation exposure of humans to benzene may cause drowsiness, dizziness, headaches, as well as eye, skin, and respiratory tract irritation, and, at high levels, unconsci. OMP and Team Penske Victory at the 2024 Indy 500 Discover more arrow_forward Ayrton Senna thirty years later What he meant to OMP Discover more arrow_forward The 2024 OMP racewear novelties Safety, functionality and style Discover more arrow_forward OMP is the new partner of Aston Martin F1 Team OMP becomes the new official racewear supplier for the iconic British motorsport team Discover more Jan 23, 2023 · The reaction with bromine. Click here:point_up_2:to get an answer to your question :writing_hand:the only o p directing group which is deactivating in nature is. no. The sum of the numbers in the first name (16) is less than the sum of the numbers in the second name The use of [bis(trifluoroacetoxy)iodo]benzene as stoichiometric oxidant and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone as organocatalyst enables a convenient oxidation of isochromans. Para. Figure S13. English: Chemical diagram showing how the positions in a benzene ring are named relative to the group X. New Arrivals. 1) was prepared according to the literature method [7]. , 2014, 16, 2042-2045. Use the friendly OMP monster (explained in the video below) to help you quickly recognize these relationships. W. 71-43-2. Benzene, however, is an extraordinary 36 kcal/mole more stable than expected. Benzene is a colourless liquid with a characteristic odour and is primarily used in the production of polystyrene. Only with benzene as part of parent. Iron is usually used because it is cheaper and more readily available. In addition to simple benzene naming and OMP nomenclature, benzene derived joints are also sometimes used as bases. The parent structure is the 6-carbon carboxylic acid with a double bond, so the last name comes from “hexene”. Reaction conditions: benzene (6 mmol), H2O2 (18 mmol), acetonitrile (5 mL), acetic acid (1 mL), PMoV1@OMP (0. The OMP solution helped us to speed up and gain more insight. gl rs ig jx tv fo gv rw cv ub