E. Skrzypczakjankun et al., FIRST EXAMPLE OF A STABLE 1,1-BIDENTATE LEWIS-ACID BASED ON BORON ANDZIRCONIUM - SYNTHESIS, REACTIVITY, X-RAY-ANALYSIS AND NMR-STUDIES, Journal of the Chemical Society, Chemical Communications, (2), 1994, pp. 127-128
[1-(1,3,2-dioxaborinane-2-yl)hexyl]zirconium(IV)2, fully characterized
by X-ray, H-1-H-1 double-quantum-filtered COSY and C-13-H-1 heteronuc
lear chemical shift correlation NMR studies, IR and elemental analysis
, reacts selectively with electrophilic reagents, N-bromo-and N-chloro
succinimide and bromine to give alpha-haloboronic esters; it also poly
merizes styrene without the aid of a co-catalyst.