Triply-Bridged Diboron Species of the Pyrazabole Type.
Abstract
B-Triorganylboroxines, (-BR-O03, react with pyrazole, Hpz, to yileld pyrazaboles in which the two boron atoms are further bridged by an O-BR-O link, i.e., RB(mu-pz)2(mu-OBRO)BR. The neutral species are structurally related to dibora cations of the type RB(mu-pz)3BR(+). The preparation of the latter by reaction of either tri(1-pyrazolyl)borate(1-) ions, RB(pz)3(-), or the pz(-) ion with trigonal boranes containing two ready leaving groups, R'BX2, has been studied and the first unsymmetrical species of the type RB(mu-pz)3)BR'(+) is described. In addition, some data on pyrazaboles of the type R2B(mu-pz)2BR'2(R = or does not = R') are reported. They include the preparation and characterization of (C6H5)2B(mu-pz)2B(C2H5)2, the first known pyrazabole containing different hydrocarbon substituents on the two boron atoms.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1985
- Accession Number
- ADA157243
Entities
People
- J. Bielawski
- Kurt S. Niedenzu
Organizations
- University of Kentucky