Reaction of ethyl 3,3-diethoxyacrylate with fischer alkoxyalkynyl transition metal carbene complexes
作者:Lurdes Jordi、Francisco Camps、Susagna Ricart、Josep M. Viñas、Josep M. Moretó、Milagros Mejias、Elies Molins
DOI:10.1016/0022-328x(94)05369-m
日期:1995.5
The title reaction afforded various amounts of differently substituted pentacarbonyl pyranylidene complexes, depending on factors such as the metal, substitution at the alkynyl moiety and relative ratio of the reagents employed. The results obtained are explained by a cycloaddition-ring-opening mechanism giving intermediates that can further cyclize to pyranylidene derivatives. The importance of the