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Chapter 7: Q7-18P (page 211)

Show the structures of the carbocation intermediates you would expect in the following reactions:

Short Answer

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a)

b)

Step by step solution

01

Step-by-Step solutionStep 1: Carbocation

Carbocations can be classed into primary, secondary and tertiary based on the number of carbons connected to the carbocation. If no carbon atoms are connected to the carbon with a positive charge, it is termed a methyl carbocation.

02

Identification of the structures of the carbocation intermediates you would expect in the following reaction (a)

(a)The given compound 2, 4-dimethylhex-3-ene reacts with HBr to form an intermediate which further results in a product, 4-bromo-2,4-dimethylhexane. The structure of the intermediate can be given as:

Reaction (a)

03

Identification of the structures of the carbocation intermediates you would expect in the following reaction (b)

(b)The given compound, ethylenecyclopentane reacts with HI to form an intermediate which further results in a product 1-ethyl-1-iodo-cyclopentane. The structure of the carbocation intermediate can be given as:

Reaction (b)

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Most popular questions from this chapter

Question: Name the following alkenes, including a cis or trans designation

Q 44Draw and name the 17 alkene isomers,C6H12 , including E, Z isomers.

On treatment with HBr, vinylcyclohexane undergoes addition and rearrangement to yield 1-bromo-1-ethylcyclohexane. Using curved arrows, propose a mechanism to account for this result.

tert-Butyl [RCO2C(CH3)3] esters are converted into carboxylic acids [RC02H] by reaction with trifluoroacetic acid, a reaction useful in protein synthesis (Section 26-7). Assign E, Z designation to the double bonds of both reactant and product in the following scheme, and explain why there is an apparent change in double-bond stereochemistry:

Which of the following compounds can exist as pairs of cis-trans isomers? Draw each cis-trans pair, and indicate the geometry of each isomer.CH3CH=CH2
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