Dihydroxylation of an alkene can be carried out with H2O2 in HCO2H. In this reaction, trans-but-2-ene affords (2R,3S)- butane-2,3-diol, whereas cis-but-2-ene affords a mixture of (2R,3R)-butane-2,3-diol and (2S,3S)-butane-2,3-diol. Does dihydroxylation by this method occur with syn or anti addition?

Dihydroxylation of an alkene can be carried out with H2O2 in HCO2H. In this reaction, trans-but-2-ene affords (2R,3S)- butane-2,3-diol, whereas cis-but-2-ene affords a mixture of (2R,3R)-butane-2,3-diol and (2S,3S)-butane-2,3-diol. Does dihydroxylation by this method occur with syn or anti addition?

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter20: Dienes, Conjugated Systems, And Pericyclic Reactions

Section: Chapter Questions

Problem 20.42P: Bicyclo-2,5-heptadiene can be prepared in two steps from cyclopentadiene and vinyl chloride. Provide...

See similar textbooks

Similar questions

Alcohols are important for organic synthesis, especially in situations involving alkenes. The alcohol might be the desired product, or the OH group might be transformed into another functional group via halogenation, oxidation, or perhaps conversion to a sulfonic ester derivative. Formation of an alcohol from an alkene is particularly powerful because conditions can be chosen to produce either the Markovnikov or non-Markovnikov product from an unsymmetrical alkene. Using your reaction roadmap as a guide, show how to convert 4-methyl-1-pentene into 5-methylhexanenitrile. You must use 4-methyl-1-pentene and sodium cyanide as the source of all carbon atoms in the target molecule. Show all reagents needed and all molecules synthesized along the way.
Bicyclo-2,5-heptadiene can be prepared in two steps from cyclopentadiene and vinyl chloride. Provide a mechanism for each step.
Draw the product or products that will be obtained from the reaction of cis-2-butene and trans-2-butene with each of the following reagents. If a product can exist as stereoisomers, show which stereoisomers are formed. 1. HCl. 4.Br2 in CH2Cl2 7. H2O + H2SO4 2. BH3/THF, followed by HO-, H2O2, H2O 5. Br2 + H2O 8. CH3OH + H2SO4 3. a peroxyacid 6. H2 + Pd/C
A chemist allows some pure (2S,3R)-3-bromo-2,3-diphenylpentane to react with a solution of sodium ethoxide(NaOCH2CH3) in ethanol. The products are two alkenes: A (cis-trans mixture) and B, a single pure isomer. Under thesame conditions, the reaction of (2S,3S)-3-bromo-2,3-diphenylpentane gives two alkenes, A (cis-trans mixture) and C.Upon catalytic hydrogenation, all three of these alkenes (A, B, and C) give 2,3-diphenylpentane. Determine the structuresof A, B, and C; give equations for their formation; and explain the stereospecificity of these reactions
True or false? 2-bromo-2-methylpropane undergoes SN1 rather than SN2 because the nucleophile experiences steric hindrance, and a stable carbocation can be formed. When hydroxide ion reacts with 1-chloropropane the main product is 1-propanol.
(1) Predict the outcome of the addition of HBr to (a) trans-2-pentene, (b) 2-methyl-2-butene, and (c) 4-methylcyclohexene. How many isomers can be formed in each case? (2) Addition of HBr to 3,3-dimethyl-1-butene gives a mixture of two isomeric alkyl bromide products. Draw structures for the two products, and give a mechanistic explanation for their formation.
What synthetic goal is achieved by subjecting an alkene to an oxymercuration-demercuration reaction sequence? anti-Markovnikov addition of H 2O, preventing skeletal rearrangement anti-Markovnikov addition of H2O, promoting skeletal rearrangement Markovnikov addition of H 2O, preventing skeletal rearrangement Markovnikov addition of H 2O, promoting skeletal rearrangement anti-Markovnikov addition of H2O, syn-hydroxylation
Consider a reaction where cis-but-2-ene is treated with OsO4 followed by NaHSO3/H2O. Draw the structure of one product that is formed in the reaction, including correct stereochemistry.
When 1 mole of buta-1,3-diene reacts with 1 mole of HBr, both 3-bromobut-1-ene and 1-bromobut-2-ene are formed. Propose a mechanism to account for this mixture of products.
In each case below select the synthetic procedure/s that could be used to carry out the transformation, giving the alcohol shown as the single major product.The procedures are:Hydroboration/oxidation: alkene + BH3; then H2O2, -OH.Oxymercuration: alkene + Hg(OAc)2, H2O; then NaBH4
A chemist allows some pure (2S,3R)-3-bromo-2,3-diphenylpentane to react with a solution of sodium ethoxide(NaOCH2 CH3) in ethanol. The products are two alkenes: A (cis-trans mixture) and B, a single pure isomer. Under the same conditions, the reaction of (2S,3S)-3-bromo-2,3-diphenylpentane gives two alkenes, A (cis-trans mixture) and C. Upon catalytic hydrogenation, all three of these alkenes (A, B, and C) give 2,3-diphenylpentane. Determine the structures of A, B, and C; give equations for their formation; and explain the stereospecificity of these reactions.
When sodium methoxide base and hydrogen bromide are removed from trans-1-bromo 2-methyl cyclohexane, considering the conformation of the starting compound, find the product that will be formed by writing and explaining the mechanism of the reaction.