N(C2H5)3 in diethyl ether byproducts: {N(C2H5)3H}Cl; to a cooled (-78 °C) soln. of (C6H5)B(OH)2 and excess triethylamine in Et2O was added dropwise a soln. of 1,3-dichlorodimethyldiphenyldisiloxane in the same solvent, warmed to room temp., mixture was allowed to stir overnight;; filtration, evapn. of the solvent; purification by vacuum distillation to give a clear partially solid boracyclotrisiloxane; elem. anal.; isolated as mixture of isomeres (cis/trans = 45percent/55percent);;

in toluene Condensation; Heating;