Organosilyl- and silylorgano-pentaboranes: monocarbahexaboranes from 2-[(chlorodimethylsilyl)methyl]pentaborane(9)
Abstract
Bridge and terminally substituted pentaborane(9) derivatives of the type [(ClCH2)Me2Si] B5H8, have been prepared. Rearrangement of both the 1- and 2-terminally substituted pentaboranecompounds to the carbon-attached isomers, 1- and 2-[(ClMe2Si)CH2] B5H8, is accomplished with the use of AlCl3 as catalyst. Flash thermolysis of 2-[(ClMe2Si)-CH2] B5H8 yields SiMe2ClH (48%), B5CH9(4.2%), and B5CH7(9.4%) as the major volatile products. Alkylation of B5H9 with SiMe3(CH2Cl) in the presence of AlCl3, gives 1 -MeB5H8 and SiMe3Cl in quantitative amounts, whereas use of Si(CH2Cl)Cl3 as the alkylating agent gives only 1-[(Cl3Si)CH2]Br5H8.