摘要:
Addition of oxalyl chloride to zirconacycles prepared from 1-alkynylphosphonates 1 zirconocene dichloride, and two equivalents of EtMgBr smoothly produced novel 2-oxo-cyclopentenylphosphonates 6 in 58-81% isolated yields in the presence of a copper catalyst. (c) 2014 Elsevier Ltd. All rights reserved.