ON 2-(DIMETHYLAMINOMETHYL)FERROCENYL COMP OUNDS OF VANADIUM, NIOBIUM,AND TANTALUM

Former results, indicating the ability of (dimethylaminomethyl) ferroc enyl groups forming stable sigma-organo transition-metal derivatives, were proved by the synthesis of heterobimetallic 2-(dimethylaminomethy l)ferrocenyl compounds of the three-valued vanadium as well as five va lued niobium and tantalum from VCl3, NbCl5, TaCl5, and (FcN)Li (I). Th e synthesis and properties of the compounds (FcN)2VCl (II), (FcN)nNbCl 5-n(THF), [n = 1, x = 1,3 (111); n = 2, x = 0 (IV); n = 3, x = 0 (V)] as well as (FcN)TaCl4(THF)1.5 (VI) are reported. An intensive characte rization, especially in respect of possible chelate structures was tri ed by i.r., H-1-n.m.r., uv-vis, mass spectroscopy, and elementary anal ysis.