The intramolecular tandem two-carbon ring expansion was accomplished by the treatment of 2,2-dialkyl-3-hydroxy-3-(1-methoxyallenyl)indanones 1 with some strong bases to afford the corresponding exo-benzocycloheptene-1,5-diones 3.
分子内串联双碳环的扩展是通过将2,2-二烷基-3-羟基-3-(1-甲氧基烯丙基)
茚满酮1与一些强碱处理,得到相应的外型苯并
环庚烯-1,5-二酮3。