Diels-Alder Reactions of a 6-Arenyl Fulvene Participating both as Diene and Dienophile

Abstract
Diels-Alder reactions of 6-(2-phenylethenyl)fulvene with electron deficient dienophiles and dienes are described. The participation of the fulvene both as 4π and 2π addend is rationalised using MNDO and AM1 calculations