The novel borosilicate compound [(t)BuSi{O(BC6H4Br)O}(3)Si(t)Bu], 1, w
hich contains a Si(OBO)(3)Si cage, is synthesised by the reaction of t
ert-butylsilanetriol with 4-bromophenylboric acid in toluene solution
at reflux and structurally characterised with X-ray diffraction and sp
ectroscopic techniques.