A new, simple access to pentacarbonyl(3-aminoallenylidene)chromium complexes
作者:Frank Stein、Michael Duetsch、Ehmke Pohl、Regine Herbst-Irmer、Armin de Meijere
DOI:10.1021/om00031a028
日期:1993.7
Primary and secondary amines react with pentacarbonyl(1-ethoxy-1-alkynylcarbene)chromium complexes 1a-g to give pentacarbonyl(3-aminoallenylidene)chromium complexes 11-18 and pentacarbonyl[ethoxy(2-aminoethenyl)carbene]chromium complexes 3-10. Crystal structures of two relevant examples are reported. The product ratio is influenced by the size of the substituent on the acetylene terminus and in the amine, the basicity of the amine, and the reaction temperature. Reaction of 1a-c,f with lithium amides gave even higher yields of the corresponding allenylidene complexes. Addition of dimethylamine to allenylidene complexes 15f and 13a gave quantitative yields of bis(dialkylamino)ethenylcarbene complexes (E/Z)-23 and (E)-24.