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Chapter 27: Q 51. (page 1103)

Question: Draw the product formed (including stereochemistry) in each pericyclic reaction.

Short Answer

Expert verified

Answer

Product of b

Step by step solution

01

Pericyclic reactions  

These reactions occur via a cyclic neutral concerted pathway. These reactions take place via the periphery of the conjugated polyene molecules.

02

Characteristics of pericyclic reactions  

These reactions take place via a cyclic transition state. These reactions are highly stereoselective. These reactions occur either via heat or light.

03

Products of the given reaction

a. The product of the given reaction is given hereunder.

Product of a.

b. The product of the given reaction is shown hereunder.

Product of b.

c. The product of the given reaction is shown hereunder.

Product of c.

d. The product of the given reaction is shown hereunder.

Product of d.

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Most popular questions from this chapter

Question: Draw the product formed when each triene undergoes electrocyclic reaction under [1] thermal conditions, [2] photochemical conditions

Question: What type of cycloaddition occurs in Reaction [1]? Draw the product of a similar process in Reaction [2]. Would you predict that these reactions occur under thermal or photochemical conditions?

Question: Classify each pericyclic reaction as an electrocyclic reaction, cycloaddition, or sigmatropic rearrangement. Indicate whether the stereochemistry is conrotatory, disrotatory, suprafacial, or antarafacial.

Question:(a) What product is formed from the [1,7] sigmatropic rearrangement of a deuterium in the following triene?

(b) Does this reaction proceed in a suprafacial or antarafacial manner under

thermal conditions?

(c) Does this reaction proceed in a suprafacial or antarafacial manner under

photochemical conditions?

Question: What compound forms geranial (Figure 21.6) by a Cope rearrangement ?
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