Photochemistry of bridged cycloheptadienes. Multiplicity dependent pericyclic rearrangements of excited bicyclo[4.2.1]nona-2,4-diene-7,7,8,8-tetracarbonitrile
作者:Zeev Goldschmidt、Elisheva Genizi
DOI:10.1016/s0040-4039(00)96647-4
日期:1987.1
Bicyclo[4.2.1]nona-2,4-diene-7,7,8,8-tetracarbonitrile rearranges selectively under direct irradiation in acetonitrile to tricyclo[3.2.2.02,4]non-6-ene-8,8,9,9-tetracarbonitrile, and upon acetone sensitization to bicyclo[3.2.2]nona-2,6-diene-8,8,9,9-tetracarbonitrile. Both products are derived from sigma bond cleavage, in contrast to the parent unsubstituted diene where only the π-bonds react.
双环[4.2.1] nona-2,4-二烯-7,7,8,8-四腈在乙腈直接照射下选择性重排为三环[3.2.2.0 2,4 ] non-6-ene-8,8, 9,9-四腈,并在丙酮中敏化双环[3.2.2] nona-2,6-diene-8,8,9,9-四腈。与仅π键反应的母体未取代的二烯相反,两种产物均源自σ键裂解。