8.8- DICYANOHEPTAFULVENE: 2,4,6-CYCLOHEPTATRIENE

Dicyanoheptafulvene 2,4,6-Cycloheptatriene-A1 -malononitrile (8) Propanedinitrile, 2,4,6-cycloheptatrien-1-ylidene- (9) (2860-54-0) Cycloheptatrienylium tetrafluoroborate Aldrich Tropylium tetrafluoroborate Cycloheptatrienylium, tetrafluoroborate (1-) (8,9) (27081-10-3) Bromomalononitrile, Malononitrile, bromo- (8) Propanedinitrile, bromo- (8) (1885-22-9)... 

In addition to 534, further [4+2]-cycloadducts of 5 were prepared by using 1,3-dienes, some of which are well known as trapping reagents of short-lived cyclic allenes and cycloalkynes. Further, cycloadditions could be achieved with tropone and several 2-substituted tropones, 8,8-dicyanoheptafulvene, 1,3,5-cycloheptatriene and a few of its 7-substituted derivatives. The products of these reactions are represented in Scheme 6.108. 

Scheme 6.108 Products ofthe interception of 1,2,4,6-cyclohepta-tetraene (5) with 1,3-diphenylisobenzofuran, anthracenes, 2,5-dimethyl-3,4-diphenylcyclopenta-2,4-dien-l-one, methyl 2-pyrone-5-carboxylate, tropones, 8,8-dicyanoheptafulvene and 1,3,5-cycloheptatrienes.

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