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Chapter 26: Q 27. (page 1070)

Draw the products (including stereoisomers) formed in each reaction.

Short Answer

Expert verified

Answer

Product of a

Product of b

d.Product of d

Step by step solution

01

Simmons-Smith reaction

The reaction involves the carbenoid formation that undergoes a cheletropic reaction, followed by the reaction with the C=C (alkene) to form a cyclopropane. This reaction is stereoselective.

02

Addition of dihalocarbenes to alkenes

The reaction takes place with syn-addition. The position of the substituted groups on alkene remains the same in cyclopropane.

03

Products of the given reaction

a. The stereoselective product is shown hereunder.

Product of a

b. The following reaction is the addition of dihalocarbenes to alkenes. The syn-addition product is shown hereunder.


c. The following reaction is the addition of dihalocarbenes to alkenes. The syn-addition product is shown hereunder.

Product of c

d. The following reaction is the addition of dihalocarbenes to alkenes. The syn-addition product is shown hereunder.

Product of d

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Most popular questions from this chapter

Draw the product formed from the ring-closing metathesis of each compound. Then, devisea synthesis of each metathesis starting material using any of the following compounds: CH2(CO2Et)2, alcohols with less than five carbons, and any needed organic and inorganicreagents.

a.

b.

The following conversion, carried out in the presence of Grubbs catalyst and ethylene gas, involves a cascade of metathesis reactions. Draw a reaction sequence that illustrates how the reactant is converted to the product Z, and indicate where each labeled atom in the reactant ends up in Z.

Devise a synthesis of each compound using a Heck reaction as one step. You may use benzene, CH2=CHCO2Et, organic alcohols having two carbons or fewer and any required inorganic reagents.

a.

b.

When certain cycloalkenes are used in metathesis reactions, ring-opening metathesis polymerization (ROMP) occurs to form a high molecular weight polymer, as shown with cyclopentene as the starting material. The reaction is driven to completion by relief of strain in the cycloalkene.

What products are formed by ring-opening metathesis polymerization of each alkene?

What product is formed by ring-closing metathesis of each compound?

a.

b.
See all solutions

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