Exchange reactions of organic halides and organo-silicon compounds with boron tribromide and boron triiodide

摘要

Reactions of the boron halides with organic halidesand organo-silicon compounds have been investigated. Theresults show exchange of halogens between the BX3 (X = Br# 1)and the organic halidef exchange of the halogen of the C-Xbond being proved. The rates of halogen exchange vary.Reaction of the heavier halides with organo-silicon compoundsindicated that the silicon-carbon bonds ruptured in theabsence of electronegative atom attached to the silicon. Thepresence of an electronegative atom (halogen or oxygen)attached to the silicon causes the bond between the siliconand the electronegative atom to be preferentially broken.Products of exchange reactions of the boron halides and theorganic halides or the organo-silicon compounds were studiedby use of 1H NMR and GC/MS. From these results some possiblemechanisms for the exchange reactions are postulated, butfurther work is indicated to prove the real courses of thereactions