Concept explainers
Interpretation:
Imagining that the
Concept introduction:
The acid protonates the epoxide and then water attacks the protonated epoxide to yield the
To draw:
The structure of the epoxide with stereochemistry.
To give:
The name and structure of the product with stereochemistry.
To explain:
Whether the product is chiral or not and whether the product is optically active or not.
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Chapter 18 Solutions
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- The stereochemistry of the products of reduction depends on the reagent used, with this in mind, how would you convert 3,3-dimethylbutan-2-one [CH3COC(CH3)3] to: (a) racemic 3,3-dimethylbutan-2-ol [CH3CH(OH)C(CH3)3]; (b) only (R)-3,3- dimethylbutan-2-ol; (c) only (S)-3,3-dimethylbutan-2-ol?arrow_forwardDehydration of 1,2,2-trimethylcyclohexanol with H2SO4 affords 1-tert-butylcyclopentene as a minor product. (a) Draw a stepwise mechanism that shows how this alkene is formed. (b) Draw other alkenes formed in this dehydration. At least one must contain a ve-membered ring.arrow_forwardDehydration of 1,2,2-trimethylcyclohexanol with H2SO4 affords 1-tert-butylcyclopentene as a minor product. (a) Draw a stepwise mechanism that shows how this alkene is formed. (b) Draw other alkenes formed in this dehydration. At least one must contain a five-membered ring.arrow_forward
- When treated with NaOH, the bromide below gives an alkene by the E2 mechanism, by eliminationof the circled atoms: (a) Draw the Newman projection from which elimination takes place. (b) Draw the mechanism. (c) Draw the product with the proper stereochemistry. (d) Assign the proper stereochemical descriptor to the product. (Z, E? Trans,CiS?) (e)What would happen to the stereochemistry of the product if the enantiomer of the starting material were used inthe reaction?arrow_forwardThe alkene shown undergoes bromination. H (a) Draw the product(s) of bromination of this compound, including all expected stereoisomers (if any). Use wedge-and-dash bonds to designate the stereochemistry at any chirality centers, and make sure to draw an explicit hydrogen if a chirality center has one. (b) Characterize the starting alkene as having the E or Z configuration. (c) characterize the product(s). (a) H Br₂ Draw the product(s) of bromination. Br H Brarrow_forwardThe alkene shown undergoes bromination. (a) Draw the product(s) of bromination of this compound, including all expected stereoisomers (if any). Use wedge‑and‑dash bonds to designate the stereochemistry at any chirality centers, and make sure to draw an explicit hydrogen if a chirality center has one. (b) Characterize the starting alkene as having the E or Z configuration. (c) characterize the product(s).arrow_forward
- The alkyl halide cis-1-bromo-4-methycyclohexane (A) undergoes a (c) substitution reaction when treated with H,0 to give a racemic mixture which is made up of product B and C. (i) What is a racemic mixture? (ii) Draw all the possible diastereoisomers of the compound below. Br Brarrow_forwardWhen 2-bromo-3-phenylbutane is treated with sodium methoxide, two alkenes result (by E2 elimination). The Zaitsevproduct predominates.(a) Draw the reaction, showing the major and minor products.(b) When one pure stereoisomer of 2-bromo-3-phenylbutane reacts, one pure stereoisomer of the major product results.For example, when (2R,3R)-2-bromo-3-phenylbutane reacts, the product is the stereoisomer with the methyl groups cis.Use your models to draw a Newman projection of the transition state to show why this stereospecificity is observed.(c) Use a Newman projection of the transition state to predict the major product of elimination of (2S,3R)-2-bromo-3-phenylbutanearrow_forward(a) Show how you would synthesize the pure (R) enantiomer of 2-butyl methyl sulfide, starting with pure (R)-butan-2-oland any reagents you need.(b) Show how you would synthesize the pure (S) enantiomer of the product, still starting with (R)-butan-2-ol and anyreagents you need.arrow_forward
- When 2-bromo-3-phenylbutane is treated with sodium methoxide, two alkenes result (by E2 elimination). The Zaitsevproduct predominates.(a) Draw the reaction, showing the major and minor products.(b) When one pure stereoisomer of 2-bromo-3-phenylbutane reacts, one pure stereoisomer of the major product results.For example, when (2R,3R)-2-bromo-3-phenylbutane reacts, the product is the stereoisomer with the methyl groups cis.Use your models to draw a Newman projection of the transition state to show why this stereospecificity is observedarrow_forwardPredict the favored product of each of the following reduction reactions. If the product is chiral, draw both stereoisomers expected. (b) NaBD4 CH3CH₂OH NaBH4 CH3CH₂OHarrow_forwardDraw all of the substitution and elimination products formed from thegiven alkyl halide with each reagent: (a) CH3OH; (b) KOH. Indicate thestereochemistry around the stereogenic centers present in the products,as well as the mechanism by which each product is formed.arrow_forward
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