Reactivity of Tetramethyldisilandiyl Bis(3-trimethylsilylcyclopentamenyl)-tetracarbonyl Diiron

Abstract

Abstract: The Fe-Fe bond of the title compound(Me₂SiSiMe₂)[η⁵-(3-Me₂SiC₅H₃)Fe(CO)]₂(μ-CO)₂(A) was cleaved by sodium amalgam and the corresponding bis (iron anion) was produced, The nucleophilic reaction of the anion with MeCOCl,PhCOCl,PhCH₂Cl, ClCH₂COOC₂H₅and Ph₃SnCl gave respectively the alkylation, acylation and metallation products (Me₂SiSiMe₂)[η⁵-(3-Me₃SiC₅H₃)Fe(CO)₂R]₂(R: CH₃CO(1), PhCO(2) PhCH₂(3), CH₂COOC₂H₅(4),Ph₃Sn(5)),The Fe-Fe bond was also (4) cleaved by iodine in chloroform and resulted in forming iron iodide (Me₂SiSiMe₂)[η⁵-(3- Me₃SiC₅H₃)Fe(CO)₂I]₂:(6). However the reaction of Awith iodine in benzene yielded Fe-I⁺-Fe bridged ionic compound (Me₂SiSiMe₂)[η⁵-(3-Me₃SiC₅H₃)Fe(CO)₂]₂I⁺·I₃^-(7).The crystal structure of 6 was determined by X-ray diffraction. The crystal is monoclinic, space group P2₁/c with a=1. 7217(4) nm,b=0.7753(2) nm,c=1. 3629(7)nm,β=103. 80(1)°,V=1.767(2)nm³,Z=4, D_c= 1.629g/cm³.The final deviation factor R=0.054.

Key words: Reactivity, Cleavage of Fe-Fe bond, Molecular structure, Nucleophilic substitution

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KONG Chui-Hua, XU Shan-Sheng, ZHOU Xiu-Zhong. Reactivity of Tetramethyldisilandiyl Bis(3-trimethylsilylcyclopentamenyl)-tetracarbonyl Diiron[J]. Chem. J. Chinese Universities, 1995, 16(9): 1400.

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Reactivity of Tetramethyldisilandiyl Bis(3-trimethylsilylcyclopentamenyl)-tetracarbonyl Diiron

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