119455-59-3Relevant academic research and scientific papers
Tungsten iron heterobimetallic complexes: Preparation and reactions
Stille,Smith, Charlene,Anderson,Miller
, p. 1040 - 1047 (2008/10/08)
Organometallic cyclopentadienyl-substituted phosphines (η5-C5H4PPh2)Fe(CO) 2CH3 (3) and (η5-C5H4PPh2)W(CO) 3CH3 (4) were prepared from (η5-C5H5)M(CO)nCH3 (M = Fe, n = 2; M = W, n = 3) by lithiation of the cyclopentadienyl ring followed by reaction with chlorodiphenylphosphine. Complexes 3 and 4 were used to synthesize heterobimetallic compounds CH3(CO)2Fe(η5-C5H 4PPh2-μ) WCH3(CO)2Cp (5) and CH3(CO)3W(η5-C5H 4PPh2-μ)Fe(COCH3)(CO)Cp (8), whose X-ray structures were determined. CH3(CO)2Fe(η5-C5H 4PPh2-μ)WCl(CO)Cp (6) was also prepared by the substitution of a carbonyl ligand on Cp(CO)3WCl by 3. The reaction of 3 with [Cp(CO)3W]+BF4- gave the heterobimetallic cation [CH3-(CO)2Fe(η5-C5H 4PPh2-μ)W(CO)3Cp]+BF 4- (7). The reduction of 6 with sodium amalgam gave the heterobimetallic anion, and although this anion could be alkylated with methyl iodide to yield 5, protonation of the anion did not produce the hydride. The reaction of the heterobimetallic cation 7 with methyllithium produced CH3(CO)2Fe(η5-C5H 4PPh2-μ)W(COCH3)(CO)Cp (12). Reaction of 7 with excess sodium borohydride gave low yields of the tungsten hydride heterobimetallic complex CH3(CO)2Fe(η5-C5H 4PPh2-μ)W(H)(CO)2Cp (10).
