Preparation and properties of molybdenum and tungsten dinitrogen complexes: XXXII. A series of novel carbonyl complexes of tungsten derived from the dinitrogen complex trans-[W(N 2) 2(Ph 2PCH 2CH 2PPh 2) 2

Abstract

Treatment of trans-[W(N 2) 2(dppe) 2] (dppe = Ph 2PCH 2CH 2PPh 2) with N,N-dimethylformamide (DMF) in benzene under reflux afforded trans-[W(CO)(DMF)(dppe) 2], together with a hydridocarbamoyl complex [WH(η 2-CONMe 2)(dppe) 2] as the intermediate stage of this decarbonylation reaction. The detailed structure of the latter complex was determined by X-ray crystallogrpahy. Reaction of trans-[W(CO)(DMF)(dppe) 2] with N 2 afforded trans-[W(CO)(N 2(dppe) 2], whose solution in benzene was further converted into a coordinatively unsaturated complex [W(CO)(dppe) 2] under reflux in an Ar atmosphere. Subsequent treatment of [W(CO)(dppe) 2] with H 2 gas gave a dihydrido complex [WH 2(CO)(dppe) 2].