Syntheses and Tandem Diels-Alder Reactivities of 7,7-Diphenylhericene(=7-(Diphenylmethylidene)-2,3,5,6-tetramethylidenebicycloheptane) and 7-Oxahericene(=2,3,5,6-Tetramethylidenebicycloheptan-7-one)

Article abstract of DOI:10.1002/hlca.19880710538

Syntheses of 7,7-diphenyl<2.2.1>hericene (4) and 7-oxa<2.2.1>hericene (5) are presented.Rate constants k1 and k2 of the two successive Diels-Alder additions of ethylenetetracarbonitrile (TCE) to 4 and to 5 have been evaluated.At 25 deg C in toluene, the r