ChemInform Abstract: Boron-Nitrogen Compounds. Part 114. Hydrazine Complexes of B-Triorganylboroxins.

ChemInform Abstract

The B-triethyl- and -triphenylboroxins form the 1:1 molar complexes (I) with the hydrazine derivatives. At room temp. the complexes exhibit only one ¹¹B NMR signal, suggesting that the species are fluxional with nitrogen coordinating to all three boron atoms of the boroxin ring. The complexes (Ia) and (Ic) can form solvates with excess of the corresponding hydrazines and the solid 1:2 molar complexes (II) and (III) are isolated. However, the second hydrazine is readily lost under reduced pressure or at elevated temperature. The complexes of B-triphenylboroxin are thermally much less stable than those of B-triethylboroxin.