Chapter 28, Problem 28.40AP

Interpretation Introduction

Interpretation:

When 1, 3, 5-cyclooctatriene, A, is heated to 80-100 °C, it comes to equilibrium with an isomeric compound B.Treatment of the mixture of A and B with ${CH}_3{O}_{2}C-C\equiv C-C{O}_2{CH}_3$ gives a compound C, which, when heated to 200 °C for 20 minutes, gives dimethyl phthalate and cyclobutene. The compounds B and C, is to be stated and the reactions have occurred is to be explained.

Concept introduction:

Commonly, cycloaddition reaction can be referred as a reaction of two different π-electron systems to form a ring product. Notably, in this reaction two new sigma bonds are formed in product with the disappearance of two fewer π-bonds. In other words, cyclo addition reaction can be best described as the reaction of number of electrons involved. In [4+2] cycloaddition one component is having four electrons and other component is having two electrons.