deprotonated form of [(fluorene)FeCp]PF6 functions as an efficient cyclopentadienyliron (CpFe) transfer reagent to other cyclopentadienyls (Cp‘) to give mixed ferrocenes (CpFeCp‘). By using this method, many new mixed ferrocenes have been prepared, and one of the mixed ferrocenes has been used to make bi- and trimetallic compounds.
Formation of a strained [3]ferrocenophane via base-catalyzed intramolecular cyclization
作者:Chi-Fa Chiu、Chien-Liang Hwang、Dung-Shien Pan、Yuan Jang Chen、Keh Shin Kwan
DOI:10.1016/s0022-328x(98)00561-0
日期:1998.7
Synthesis of 1,3-diferrocenyl-3-methyl[3]ferrocenophan-1-ene by base-catalyzed intramolecularcyclization is described. The molecular structure of the title compound has been determined by single-crystal X-ray analysis. It crystallizes in monoclinic space group P21/c with a=15.580(6) Å, b=9.512(3) Å, c=34.493(9) Å, β=98.20(3)°, Z=8, and V=5060(3) Å3.
作者:E. I. Klimova、T. Klimova、M. Martinez Garcia、J. M. Martinez Mendoza、S. Hernandez Ortega、L. Ruiz Ramirez
DOI:10.1023/a:1022460701988
日期:——
2-Chloro-and 2-bromo-1,1-diferrocenylcyclopropanes were synthesized as Z- and E-isomers with respect to the ferrocenyl substituent having a bisector orientation. The structure of Z-2-chloro- 1, 1 -diferrocenylcyclopropane was confirmed by X-ray diffraction analysis. Treatment of the resulting monohalides with potassium tert-butoxide in dimethyl sulfoxide afforded 3,3-diferrocenylcyclopropene in 20%' yield. The small ring in halogen- substituted diferrocenylcyclopropanes and diferrocenylcyclopropene is readily cleaved to give predominantly 3-ferrocenyl-1H-cyclopentaferrocene.
Dehydrohalogenation of isomeric 2-chloro- and 2-bromo-1,1-diferrocenyleyclopropanes (Z- and E-isomers with respect to the 'bisecting' ferrocenyl substituent) under the action of Bu'OK in DMSO afforded 3,3-diferrocenylcyclopropene. In solution, this underwent facile opening of the small ring to give 3-ferrocenyl-1H-cyclopentaferrocene ( similar to 55%) and 1,1-diferrocenylpropene (15%). The spatial structure of Z-2-chloro-1,1-diferrocenylcyclopropane and 1,1-diferrocenylcyclopropane were elucidated by X-ray diffraction analysis of a single crystal. (C) 2002 Elsevier Science B.V. All rights reserved.