Mono-, bis- and tris( chlorophosphaalkenyl) stibanes have been obtained from Mes*P=C( SiMe3) Li ( Mes* = 2,4,6-tri-tert-butylphenyl) or from the phosphaalkene carbenoid Mes* P=C( X) Li ( X = Cl) and SbF3, Mes*Sb( OMes*) F or Mes*SbF2. Bis[ chloroalkenyl] stibanes [ R2C=C(Cl)](2)SbCl (R2C =fluorenylidene and 2,7-di-tert-butylfluorenylidene) have also been obtained from R2C=C( Cl) Li and SbCl3. (C) 2008 Elsevier B.V. All rights reserved.
Mono-, bis- and tris( chlorophosphaalkenyl) stibanes have been obtained from Mes*P=C( SiMe3) Li ( Mes* = 2,4,6-tri-tert-butylphenyl) or from the phosphaalkene carbenoid Mes* P=C( X) Li ( X = Cl) and SbF3, Mes*Sb( OMes*) F or Mes*SbF2. Bis[ chloroalkenyl] stibanes [ R2C=C(Cl)](2)SbCl (R2C =fluorenylidene and 2,7-di-tert-butylfluorenylidene) have also been obtained from R2C=C( Cl) Li and SbCl3. (C) 2008 Elsevier B.V. All rights reserved.
Dechlorofluorination of ArSb(F)-C(Cl) = CR2 (CR2 = fluorenylidene, Ar = 2,4,6-tri-tert-butylphenyl) by tert-butyllithium afforded a 3,4-bis(fluorenylidene)-1,2-distibacyclobutane. The formation of the latter probably involves the transient stibaallene ArSb = C = CR2 followed by a head-to-head dimerization via two Sb = C double bonds. Molecular orbital calculations at the ab initio and DFT levels support the head-to-head dimerization of ArSb = C = CR2 with the formation of a 1,2-distibacyclobutane. (C) 2004 Elsevier B.V. All rights reserved.
Stibasilene Sb═Si and Its Lighter Homologues: A Comparative Study
作者:Vladimir Ya. Lee、Shinji Aoki、Manami Kawai、Takahiko Meguro、Akira Sekiguchi
DOI:10.1021/ja5026084
日期:2014.4.30
The multiply bonded derivatives of the heavier main group elements are among the most challenging targets for synthetic pursuits. Those of them featuring a double bond between the silicon and group 15 element are represented mostly by the silaimines -N=Si< and phosphasilenes -P=Si< with a very few examples of arsasilenes -As=Si<. In this contribution, we report on the synthesis and structural elucidation of the first stable stibasilene and novel phosphasilene and arsasilene derivatives, featuring an identical substitution pattern. A systematic comparison within the series phosphasilene-arsasilene-stibasilene is made on the basis of their experimental and computational studies.