N-Triazolyboranes
Abstract
1,3-Dimethyl-2-(N-triazolyl)-1,3,2-diazaboracycloalkanes, (tz) BNCH3(CH2)(n)NCH3 (where Htz = 1,2,3-triazole (1), 1,2,4-triazole (2), benzotriazole (4); n = 2,3) have been synthesized by condensation procedures. The resultant species are monomeric and contain three-coordinate boron; they do not dimerize at temperatures as low as -50 C. Compounds of type 1, however, exist as a mixture of the 1- and 2-isomers, whereas 2 and 4 are the 1-isomers exclusively. Only species of type 2 are fluxional at elevated temperatures, those of type 1 and 4 are static up to 80 C. However, the monomeric N- triazolylboranes have remaining Lewis acidity and can complex with additional Htz. Based on this feature, representative bis(1-triazolyl)diorganylborates, Na((tz)2BR2) (Htz = 1,2,4-triazole; R = C2H5 or 1/2 (C8H14) where (C8H14)BH = 9- borabicyclo(3.3.1)nonane), were readily obtained by the reaction of (dimethylamino)diorganylboranes with 1 molar equiv of Htz and subsequent treatment with 1 molar equiv of M(tz) (M = alkali metal). The salts were converted to some representative complexes, e.g., R2B(mu-tz)2Pd(pi-CH2CHCH2).
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1990
- Accession Number
- ADA224893
Entities
People
- Junwu Bai
- Kurt S. Niedenzu
Organizations
- University of Kentucky