A Triphenylboroxin Derivative Possessing Two Intramolecular Chelates

Condensation of 2-formylbenzeneboronic acid and 1,1-dimethylhydrazine afforded the title compound, bis(8-B-4)-1,3,5-tris{2-[(N,N-dimethylhydrazono)methyl]phenyl)}boroxin, C₂₇H₃₃B₃N₆O₃, a tridehydro cyclic trimer of the expected simple benzaldehyde hydrazone and the first triphenylboroxin derivative found to possess two B chelating interactions. The double chelation induces molecular asymmetry but effects only a slight puckering in the central boroxin ring.

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