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Chapter 27: Q 50. (page 1103)

Question: What type of pericyclic reaction is illustrated in each reaction?

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01

Electrocyclic reaction

The pericyclic reactions that involve the conversion of a sigma bond to a pi bond or vice-versa are known as electrocyclic reactions.

02

Sigmatropic rearrangement

The reactions that involve the migration of a sigma bond followed by the delocalization of a pi bond are known as sigmatropic rearrangement reactions.

03

Given reactions

The pericyclic reactions involved in the given reactions are as follows.

Electrocyclic reaction

The given reaction involves the electrocyclic ring-opening.

Sigmatropic rearrangement

The given reaction involves a [1,2] hydrogen shift and, therefore, is a sigmatropic reaction.

Electrocyclic ring closure

The given reaction is an electrocyclic ring-closure reaction.

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Most popular questions from this chapter

Question:What type of sigmatropic rearrangement is illustrated in each equation?

Question: (a) Using Figure 27.2 as a guide, draw the molecular orbitals for hexa-2,4-diene. (b) Label the HOMO and the LUMO in the ground state. (c) Label the HOMO and the LUMO in the excited state.

Question: Draw the product of each Diels鈥揂lder reaction and indicate the stereochemistry at all stereogenic centers

Question: What product is formed when each compound undergoes thermal electrocyclic ring-opening or ring closure? Label each process as conrotatory or disrotatory and clearly indicate the stereochemistry around tetrahedral stereogenic centers and double bonds.

Question: Show how the following starting material is converted to the given product by a series of two pericyclic reactions. Account for the observed stereochemistry.
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