Some cyclopolyphosphine complexes of molybdenum, tungsten, palladium, and copper

Abstract

When refluxed in tetrahydrofuran, tetraethycyclotetraphosphine and hexacarbonyl molybdenum afford the complex (EtP)₅Mo(CO)₄, whereas in cyclohexane a polymeric product [(EtP)₄Mo(CO)₂]_n is obtained. The complex (EtP)₄W(CO)₄ is formed when tris(acetonitrile)tricarbonyltungsten and tetraethylcyclotetraphosphine are refluxed together in acetonitrile. Tetraethylcyclotetraphosphine reacts with bis(benzonitrile)palladium dichloride, copper(I) chloride and bromide to give (EtP)₄PdCl₂, (EtP)₄CuCl, and (EtP)₄CuBr. Although pentamethylcyclopentaphosphine reacts with copper(II) bromide to give (MeP)₅CuBr, with the chloride the compound (MeP)₄CuCl is obtained.