First examples of oxaphosphirane pentacarbonylchromium(0) and -molybdenum(0) complexes: synthesis, structures and reactions

Abstract

Synthesis of the first oxaphosphirane chromium(0) and molybdenum(0) complexes of the type [{(R¹PCH(R²)-O}M(CO)₅] (R¹ = C₅Me₅) (8a–e, 15a–e) and (R¹ = CH(SiMe₃)₂) (9a–e, 16a–e) via reaction of dichloro(organo)- (1, 2, 10, 11) and chloro(organo)phosphane complexes (3,4,12) with lithium bases and aldehydes 7a–e is reported. Furthermore, bicyclic 1,3-oxaphospholane complexes 17 and 18 have been obtained via O-protonation of oxaphosphirane complexes 8a and 15a with HCl. All complexes were characterized by NMR, IR spectroscopic, mass spectrometric investigations and, in addition, single-crystal X-ray structures of complexes 8a–e, 9a,c, 15a,b,e, 16a–c, 17, 18 are presented and discussed.