Photochemical reactions, 136th communication. Photochemistry of conjugated epoxyenones and dienes of the ionone series: Influence of a neighboring spiro-oxirane function
作者:Anthony O'Sullivan、Bruno Frei、Oskar Jeger
DOI:10.1002/hlca.19840670323
日期:1984.5.2
intermediate k to the acetylenic dienone (E)-31. The carbene 1, showing behaviour typical of vinyl carbenes, furnishes the cyclopropene 30. The alternative carbene m, however, undergoes an insertion reaction into the neighboring oxirane C,C-bond leading to the proposed but not isolated oxetene 43, which is further transformed to the products 33A _ B by an intramolecular cycloaddition.