<i>ansa</i>-Bis(1-boratabenzene) Zirconium(IV) Complexes with Short Carbon Bridges to Boron

Abstract

The reaction of 1,1-dibutyl-1-stannacyclohexa-2,5-diene ( 8 ) with 1,2-bis(dichloroboryl)benzene 9 affords exchange product 10, which on deprotonation followed by reaction with ZrCl 4 gives the very labile o -phenylene-bridged bis(1-boratabenzene)zirconium dicholoride 6 . A similar reaction sequence from 8 and 1,1-bis(dichloroboryl)-2-methyl-1-propene 11 affords the 1,1-isobutenyl-bridged bis(1-boratabenzene)zirconium dichloride 7 . The X-ray structure of 7 is described.