A novel trico-ordinated boronium salt: 1,3-dimethyl-2-phenanthridin-5-yl-1,3,2-diazaborolidinium trifluoromethansesulphonate

Abstract

N.m.r. evidence suggests that pyridine but not phenanthridine reacts with 2-chloro-1,3-dimethyl-1,3,2-diazaborolidine (1a) in a 1 : 1 ratio with formation of an ionic compound; however, 1,3-dimethyl-2-trifluoromethanesulphonato-1,3,2-diazaborolidine (1b) produces a 1 : 1 addition product with phenanthridine which was shown to be the title compound by an X-ray structure determination.