186982-59-2Relevant academic research and scientific papers
A series of novel binuclear iron-rhodium complexes prepared from ethynylferrocene
Wiedemann, Ralf,Fleischer, Roland,Stalke, Dietmar,Werner, Helmut
, p. 866 - 870 (1997)
The chlororhodium(I) compound [RhCl(PiPr3)2]2 (1) reacts with ethynylferrocene (2) by oxidative addition to give the alkynyl(hydrido)rhodium(III) complex [RhH(C=CFc)Cl(PiPr3)2] (3) almost quantitatively [Fc = (η5-C5H4-)Fe(η5-C 5H5)]. Compound 3 is slowly converted in benzene at room temperature to the vinylidene isomer trans-[RhCl(=C=CHFc)(PiPr3)2] (4). Treatment of 4 with Grignard reagents RMgX affords the phenyl- and vinylrhodium(I) derivatives trans-[Rh(R)(=C=CHFc)(PiPr3)2] (5, 6) of which the latter (R = CH=CH2) rearranges to the isomeric η3-2-4-butadienyl complex [Rh(η3-trans-CH2CHC=CHFc)(PiPr3) 2] (8). The corresponding η3-allyl compound [Rh(η3-anti-CH2CH=CHFc)(PiPr3)2] (7) is obtained from 4 and CH3MgI, possibly via trans-[Rh(CH3)(=C=CHFc)(PiPr3)2] as an intermediate. The X-ray crystal structure analysis of 7 confirms the anti position of the ferrocenyl group at the allylic ligand.
