By the action of a solution of hydrogen chloride in nitromethane, 3-methybut-1 - ene gives a mixture of 2-chloro-3- methylbutane and 2-chloro-2-methylbutane in the ratio (40:60). Under the same conditions, 3,3-dimethybut-1 - ene leads to a mixture of 2-chloro-2,3-dimethylbutane and 2-chloro-3, 3-dimethybultane in the ratio (83:17). Explain these results.
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- The base-promoted rearrangement of an -haloketone to a carboxylic acid, known as the Favorskii rearrangement, is illustrated by the conversion of 2-chlorocyclohexanone to cyclopentanecarboxylic acid. It is proposed that NaOH first converts the a-haloketone to the substituted cyclopropanone shown in brackets and then to the sodium salt of cyclopentanecarboxylic acid. (a) Propose a mechanism for base-promoted conversion of 2-chlorocyclohexanone to the proposed intermediate. (b) Propose a mechanism for base-promoted conversion of the proposed intermediate to sodium cyclopentanecarboxylate.Give the substitution and elimination products you would expect from the followingreactions.(a) 3-bromo-3-ethylpentane heated in methanolSuggest a reasonable series of reagents and reactions conditions to prepare cis-2-methylcyclohexly acetate (A) from trans-2-methylcyclohexanol.
- Q1/ Do as required: 1- The role of HSO, in Preparation of Nitrobenzene. Explain 2- The using of NaOH with 2-naphthol in preparation of azo dye? 3- Preparation of Nitrobenzene in cool phase. 4- Adding HCI in the preparation of aniline from nitrobenzene. 5- When acetanilide reacts with bromine (x), acetanilide gives p-bromo acetanilide only, why? 6- In an experiment Hydrolysis of Acetanilide What color does the litmus nanerThe reaction of 1- methylcyclopentene with mercuric trifluoroacetate in ethanol followed by reduction with sodium borohydride gives 1-ethoxy-1- methylcyclopentane. The -OH peak in the IR shows up at 1700 cm-1 as a sharp peak. (S)-2-bromohexane is the product of the reaction of (S)-2-hexanol with PBr3. The 1H NMR spectrum of 1- pentanol will show a peak for the H atom of the -OH group at 10 ppm delta. A tosylate is a great protecting group for an alcohol. The Williamson ether synthesis is an SN2 reaction of an alkoxide ion with a primary alkyl halide. Thionyl chloride converts ketones into alkyl halides. In an oxidation reaction, the oxygen content of our organic molecule decreases. ✓ [Choose ] False True [Choose ] [Choose ] [Choose ] [Choose ] [Choose ] [Choose ] [Choose ]we know that ethers, such as diethyl ether and tetrahydrofuran, are quite resistant to the action of dilute acids and require hot concentrated HI or HBr for cleavage. However, acetals in which two ether groups are linked to the same carbon undergo hydrolysis readily, even in dilute aqueous acid. How do you account for this marked difference in chemical reactivity toward dilute aqueous acid between ethers and acetals?
- Treatment of 1,3,6-cyclononatriene (Compound 1), or its dimethyl derivative (Compound 2), with potassium amide (KNH₂) in liquid ammonia results in the formation of anion 1a or 2a, respectively (J. Am. Chem. Soc. 1973, 95, 3437-3438): 9 15.85a 2 6 3 4 5 Compound 1 (R=H) Compound 2 (R=CH3) * You answer is incorrect. KNH₂ KNH₂ 1a (anion) 2a (anion) Of the following, which is NOT one of the four resonance structures of 1a?The p-toluenesulfonate derived from (R)-2-octanol and p-toluenesulfonyl chloride was allowed to react with sodium benzenethiolate (C6H5SNa). Give the structure, including stereochemistry and the appropriate R or S descriptor, of the product.A student attempted to prepare 1-chlorobutane by mixing 1-butanol with NaCl in acetone. Was the student succesful? Explain.
- Reaction of -pinene with borane followed by treatment of the resulting trialkylborane with alkaline hydrogen peroxide gives the following alcohol. Of the four possible cis,trans isomers, one is formed in over 85% yield. (a) Draw structural formulas for the four possible cis,trans isomers of the bicyclic alcohol. (b) Which is the structure of the isomer formed in 85% yield? How do you account for its formation? Create a model to help you make this prediction.When warmed in dilute sulfuric acid, 1-phenyl-1,2-propanediol undergoes dehydration and rearrangement to give 2-phenylpropanal. (a) Propose a mechanism for this example of a pinacol rearrangement (Section 10.7). (b) Account for the fact that 2-phenylpropanal is formed rather than its constitutional isomer, 1-phenyl-1-propanone.The following equation shows the reaction of trans-2,3-diphenyloxirane with hydrogen chloride in benzene to form 2-chloro-1,2-diphenylethanol. (a) How many stereoisomers are possible for 2-chloro-1,2-diphenylethanol? (b) Given that opening of the epoxide ring in this reaction is stereoselective, predict which of the possible stereoisomers of 2-chloro-1,2-diphenylethanol is/are formed in the reaction.