A perturbational molecular orbital analysis of the cycloaddition of 2-carbomethoxy-1,4-benzoquinone to vinylcyclohexene

The application of the intermolecular orbital method to the orientation phenomena in the Diels-Alder reaction of vinylcyclohexene with carbomethoxy- p benzoquinone is discussed in relation to the frontier orbital approximation and to the limits of the adopted method.