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Chapter 30: Q.30-17 (page 1033)

The following thermal rearrangement involves two pericyclic reactions in sequence. Identify them, and propose a mechanism to account for the observed result.

Short Answer

Expert verified

Mechanism is given as

Step by step solution

01

Reaction

The steps involved are

  1. 4 Membered Ring Opening
  2. 3 Membered Ring Opening(4+2 cycloaddition)
02

Mechanism

The mechanism can be represented as:

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Most popular questions from this chapter

Vinyl-substituted cyclopropanes undergo thermal rearrangement to yield cyclopentenes. Propose a mechanism for the reaction, and identify the pericyclic process involved.

trans-3,4-Dimethylcyclobutene can open by two conrotatory paths to give either (2E,4E)-2,4-hexadiene or (2Z,4Z)-2,4-hexadiene. Explain why both products are symmetry-allowed, and then account for the fact that only the 2E,4Eisomer is obtained in practice.

Answer Problem 30-22 for the thermal and photochemical cyclizations of (2E,4Z,6Z,8Z)-2,4,6,8-decatetraene.

Look at Figure 30-1, and tell which molecular orbital is the HOMO and whichis the LUMO for both ground and excited states of ethylene and 1,3-butadiene.

The following rearrangement was devised and carried out to prove the stereochemistry of [1,5] sigmatropic hydrogen shifts. Explain how the observed result confirms the predictions of orbital symmetry.
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