Instant ligands. Part 4. Preparation of some difluorophosphinite ligands from unsaturated hydroxy compounds, and their reactions to form molybdenum complexes

Abstract

The compounds (F₂P)OCH₂CCCH₂O(PF₂) and (F₂P)OCH₂CH₂CN have been prepared by the reaction of S(PF₂)₂ with the appropriate alcohols, and have been characterised by n.m.r. and i.r. spectroscopy. The reactions of these compounds with some molybdenum(0) complexes have been studied using n.m.r. spectroscopy. The reaction of (F₂P)OCH₂CCCH₂O(PF₂) with N-methyl-pyridinium pentacarbonyliodomolybdate gives a compound with two Mo(CO)₅ groups linked by the ligand and with tetracarbonyl(norbornadiene)molybdenum, [Mo(CO)₄(nbd)], an apparently polymeric product is obtained. The reaction of (F₂P)OCH₂CH₂CN with [C₅H₅NMe][Mo(CO)₅l] gives a mixture of complexes of the types Mo(CO)₅L and Mo(CO)₄L₂, while with [Mo(CO)₄(nbd)] the sole product is the Mo(CO)₄L₂ type complex. In all these cases the ligand appears to be co-ordinated to the metal by the phosphorus atom.