Carbonylative Cyclization of Alkynes Using Cobalt Carbonyl Species Prepared via Reduction of CoBr2 with Zn under a Carbon Monoxide Atmosphere
摘要:
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.