Reduction of Aldehydes and Ketones by Transition Metal Hydrides. Part 2. Reaction of trans,trans‐[WH(CO)2(NO)(PMe3)2] with pyridine, functionalized aldehydes, and ketones

Abstract

AbstractThe reaction of trans,trans‐[WH(CO)2(NO)(PMe3)2] (1) with (pyridin‐2‐yl)‐substituted aldehydes and ketones, (pyridin‐2‐yl)C(O)R where R = H, Me, Ph, pyridin‐2‐yl, and with 6‐methylpyridine‐2‐carbaldehyde was studied. In all cases, facile insertion of the CO bond into the WH bond was observed, with rapid subsequent extrusionof a coordinated CO ligand affording O,N‐bidentate coordinated tungsten alkoxides. Only in case of pyridine‐2‐carbaldehyde and di(pyridin‐2‐yl) ketone, the initial n1 O‐bonded insertion product could be observed as unstable intemediates by low‐temperature NMR.