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A cationic mononuclear and a neutral trinuclear boron compound derived from boric acid and N2O2-type ligands of the Salan class

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Volume
694
Issue
22
Identifiers
DOI: 10.1016/j.jorganchem.2009.07.004
Keywords
  • Boron
  • Boric Acid
  • Boronium Cation
  • Salen
  • Salan

Abstract

Abstract Four different ligands of the Salan class have been prepared and reacted with boric acid. Reaction of saleanH 4 (saleanH 4 = N,N′-bis( o-hydroxybenzyl)-1,2-diaminoethane) with three equivalents of boric acid gave a neutral trinuclear boron complex containing two four-coordinate and one three-coordinate boron atom involved in a system of four heterocyclic rings of the composition {C 3BNO}, {C 2B 2N 2O} and {B 3O 3}. The salceanH 4 ligand (salceanH 4 = N,N′-bis( o-hydroxybenzyl)- trans-1,2-diaminocyclohexane) gave a so far unknown mononuclear boronium complex of the general formula [(RO) 2B(NR′R′′) 2] +. Both compounds might have applications, the trinuclear species as Lewis acid catalyst and the borocation as positively charged counterion for voluminous anions. With salpanH 4 (salpanH 4 = N,N′-bis( o-hydroxybenzyl)-1,3-diaminopropane) and salophanH 4 (salophanH 4 = N,N′-bis( o-hydroxybenzyl)-1,2-diaminobenzene) only unseparable product mixtures of oligo- and/or polymeric boron complexes could be obtained.

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