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Difluoro(supermesityl)borane reacts with monolithiated hydrazines to give the correspond ing fluoroborylated hydrazines 1a-c , which could not be dehydrofluorinated to yield definite products. From dilithiated hydrazine the 1,2-borylated species 2 was obtained. The fluoro-borylhydrazones 3a-3d prepared in an analogous way, by dehydrofluorination with tert-butyllithium, led to 5-, 6-and 7-membered boron nitrogen heterocycles depending upon the substituents of the hydrazones.doi:10.1515/znb-1994-0405 fatcat:ik7xujhp3bfxppzonhqs7n3wuu