oligosilylalkynes were converted to the respective dicobalt hexacarbonyl complexes. These compounds were found to be surprisingly reactive, indicating Si−Si bond activation in the coordination sphere of the cobalt atoms. The presence of more than one silicon−siliconbond restricted clean conversions, and therefore the pentamethyldisilanylphenylacetylene complex was prepared, which engaged in defined reactions. The
Carbonylative Cyclization of Alkynes Using Cobalt Carbonyl Species Prepared via Reduction of CoBr<sub>2</sub> with Zn under a Carbon Monoxide Atmosphere
作者:Thotapally Rajesh、Mariappan Periasamy
DOI:10.1021/om990534c
日期:1999.12.1
Alkyne-Co-2(CO)(6) complexes prepared in situ using CoBr2, Zn, and CO give the corresponding cyclopentenones or cyclopentadienones on heating in toluene or in CH2Cl2 at 25 degrees C in the presence of DMSO or amines.