A. Vyas et R. Bohra, SYNTHESIS AND CHARACTERIZATION OF BORON SPIROCHELATES .1. SOME MIXED-LIGAND BORON(III) HETEROCYCLES CONTAINING A DIOL AND 8-QUINOLINOL, Synthesis and reactivity in inorganic and metal-organic chemistry, 26(10), 1996, pp. 1691-1703
The reaction of B(OPr-i)(3) with 8-quinolinol (OXH) in 1:1 molar ratio
in refluxing benzene yields [OXB(OPr-i)(2)](1). Further reaction of (
1) with diols in refluxing benzene yields spirochelates of boron(III)
of the type [OXB(O-G-O)] (where G= -CH2-CH2-, -CH2-CH-CH2-CH3-C(CH3)(2
)-(CH3)(2)C-,-(CH2)(4)- -CH2-CH(C2H5)-CH-CH2-CH2-CH3, (CH3)(2)C-CH2-CH
-CH3, and -(CH2)(6)-). All these derivatives are soluble in common org
anic solvents and are monomeric. They were characterised by elemental
analyses, IR and multinuclear NMR (H-1, C-13, B-11) spectral studies.
These studies suggest a weak coordination between boron and the nitrog
en of the 8-quinolinol moiety leading to tetracoordination around boro
n in all of these derivatives.