Combining phosphinidene units with malonate anion: Synthesis of highly functional phosphine complexes

Abstract

Malonate anion traps the [RP-W(CO) 5] bridge of 7-phosphanorbomadiene complexes 1-3 to give functional secondary phosphine complexes [RP(H)-CH(CO 2Et) 2]W(CO) 5 (7-9). Metalation of these complexes by NaH in THF occurs at the malonic CH group, but the alkylation of the resulting carbanions preferentially takes place at phosphorus. When R stands for β-chloroethyl, the corresponding carbanion cyclizes to give the functional phosphirane complex 11. © 2004 Wiley Periodicals, Inc.