Efficient solid state photocyclization of sterically congested α-o-tolyl ketones despite “poor” geometries for hydrogen abstraction
作者:Peter J. Wagner、Boli Zhou
DOI:10.1016/s0040-4039(01)80575-x
日期:1989.1
Several α-mesityl and α-(o-tolyl)acetophenones undergo photocyclization to 2-indanols almost quantitatively when irradiated as crystals, even those that undergo significant competing α-cleavage or 1,3-aryl shift in solution. The requisite triplet δ-hydrogen abstraction apparently can occur at what appears to be a “bad” geometry. One ketone, α-(o-tolyl)propiophenone, partially rearranges to the β-isomer
几种α-间苯二甲酰和α-(邻甲苯基)苯乙酮以晶体辐射时几乎定量地发生光环化成2-茚满醇,即使那些在溶液中经历显着竞争的α-裂解或1,3-芳基转移的化合物也是如此。必要的三重态δ-氢提取显然可以发生在看似“不良”的几何形状上。一种酮,α-(邻甲苯基)丙酮,部分重排为β-异构体,这是由最初的α-裂解形成的自由基歧化所致。