Reaction of l,3-DiaIkyl-4,5-dimethylimidazol-2-ylidenes with 2-Bromo-2,3-dihydro-l#-l,3,2-diazaboroles (Alkyl = iPr and riBu)

Article abstract of DOI:10.1002/cber.19971300606

2-Bromo-2,3-dihydro-lH-l,3,2-diazaboroles (3a-c) were synthesized by cyclocondensation of dilithiated 1,4-diazabutadienes (5a-c) with boron tribromide in hexane. 3a was also obtained by sodium amalgam reduction of the corresponding borolium salt 1 in hexa