The in situ generation of non-stabilized carbene complexes viaintramolecular acetylene insertion: A new two-alkyne annulation and a new preparation of γ-keto esters
作者:William D. Wulff、Yao-Chang Xu
DOI:10.1016/s0040-4039(00)80110-0
日期:1988.1
Non-heteroatom stabilized carbenecomplexes can be generated in solution by mild thermolysis (50°C) of 4-hexynyl and 5-heptynyl (methoxymethylene) complexes of chromium and tungsten pentacarbonyl. These intermediates react with acetylenes to give a new type of two-alkyne annulation product. In the absence of acetylenes, these intermediates can be trapped with methanol as their carbonylated products