Chapter 28, Problem 28.36AP

Interpretation Introduction

Interpretation:

Heptafulvalene undergoes a thermal reaction with tetracyanoethylene (TCNE) to give the adduct shown in Fig. P28.36.The stereochemistry of this adduct is to be explained.

Concept introduction:

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.