Synthesen im system {carbonylmetallat/ketenimin/säure}: XXX. Neue ferra- und rhenaazetidine

Abstract

The metal carbonyl anions [Fe(η-C 5H 5(CO) 2] − and [Re(CO) 5] undergo regio- and site-specific [2 + 2]-cycloadditions with the ketenimines Ph 2CCNR (R = Me, Ph) to give the (isolable) anionic complexes [L n M{C(CPh 2)N(R)C (O)}] − (L n M = Fe(η-C 5H 5)CO, Re(CO) 4) which have been alkylated and acylated at the exocyclic oxygen atom of the carbonyl function. The result is stable neutral complexes having a metallaazetidine structure which is composed of an α-metallated enamine and an N,O carbene part. IR, 1H, and 13C NMR data are presented.