DIMESITYLAMINOBORANES AND UNSYMETRIC TRIAMINOBORANES. STABILITY OF AMINODIOXABOROLES AND DIMESITYLBOROXYETHANOL

摘要

Bulky dimesitylaminoboranes, unsymetrictriaminoboranes and an amino boronsulfonamide were preparedeither by transmetallation or transamination reactions. Fromtris(diethylamino) borane, diethylaminodioxaborole was obtainedeither by protic cleavage by 3,5-di-t-butylcatechol or by additionreaction of 3,5-di-t-butyl-o-quinone through S.E.T. in the firststep of the reaction. From the same tris(diethylamino) borane,1,2-ethanediol did not lead to the expecteddiethylaminodioxaborolane but to 2, 5, 7, 10, 11, 14-hexaoxa-1,6-diborane bicyclo[4.4.4.]tetradecane. 2-dimesitylboroxyethanol,isolated as a white powder, is not thermally stable and leadseither to 1, 2-bis(dimestiylboroxy0 ethane or to 1, 3-dioxaborolane with mesitylene elimination. Dimesitylboranesundergo nucleophilic substitution of a mesityl group in thepresence of a strong nucleophile.