TRIOL BORATES AND AMINOALCOHOL DERIVATIVES OF BORIC-ACID - THEIR FORMATION AND HYDROLYSIS

Boron as [B(OH)(4)](-) reacts in aqueous solution with triols RC(CH2OH )(3) (R = CH3, C2H5 or NH2) forming various amounts of mono-chelate, b is-chelate and cage structures which are identified and measured by C- 13, H-1 and B-11 NMR spectra. NMR spectra of the products of B(OH)(3) with N(CH2CH2OH)(3) or N(CH[CH3]CH2OH)(3) are also reported and assign ed. Triethanolamine berate is shown to hydrolyse via a structure which includes one pendant CH2CH2OH group. Triisopropanolamine berate exist s as symmetrical and unsymmetrical diastereomers, the latter being les s susceptible to hydrolysis in either acidic or basic media. Copyright (C) 1996 Elsevier Science Ltd