Triazaboles and Related Triazole Derivatives of Boron
KENTUCKY UNIV LEXINGTON DEPT OF CHEMISTRY
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The reaction of trimethylamine-borane, Me3NBH3, with 1,2,4-triazole Hst results in the formation of an oligomer mixture of the composition H2B stn species with n up to six could be identified by mass spectrometry. Dimeric species sym-triazoboles, R2Bmu-st2BR22,R hydrocarbon group, can be obtained in low yield from the condensation of R3B with Hst, the interaction of halo diorganylboranes, R2BX X CI, Br with N-trimethylsilyl-1,2,4- triazole Hat with excess of R3B ultimately gives a resonable yield of mixture of two isomeric. Triazaboles of type 2 with the amino groups in either the 1,5 or 1,7 positions, whereas transamination of Me2NBR2 with Hat preferentially gives the 1,5-diamino isomer but in low yield. Several Boron Derivatives of 1,2, 3-triazoles have been isolated and characterized these include tetrameric species derived from 1,2,3-triazole Hut, or benzotriazole Hbt with a cyclic structure 6 resembling that of porphin, but also oligomeric materials R2Butn and R2Bbtn Keywords N-triazolylboranes, Tetramers, N- triazolylboranes, Oligomers.
- Organic Chemistry