658711-29-6Relevant articles and documents
Synthesis and characterisation of cyclo-boratetrasiloxane, (RBO)(Me 2SiO)3 (R=nBu, Ar), derivatives
Beckett, Michael A.,Rugen-Hankey, Martin P.,Varma, K. Sukumar
, p. 3333 - 3337 (2008/10/08)
Low temperature reactions of dilute solutions of 1,5-dichloro-1,1,3,3,5,5- hexamethyltrisiloxane with boronic acids {RB(OH)2; R=nBu, C6H4Me-2, C6H4Me-3, C 6H4Me-4, C6H4OMe-3, C 6H4OMe-4, C6H4Br-2, C 6H4Br-3, C6H4Br-4} in the presence of a twofold excess of Et3N afforded the 8-membered ring products, cyclo-boratetrasiloxanes, (RBO)(Me2SiO)3, in moderate yields. New compounds were colourless oils and were characterised by elemental analysis, NMR (1H, 11B, 13C, 29Si), IR and MS. The cyclo-boratetrasiloxanes are weakly Lewis acidic, with acceptor number (AN) values of ~30, but do not form adducts with amines.