Binuclear Salan borate compounds with three-coordinate boron atoms

A series of binuclear boron compounds supported by Salan(Bu)H-4 ligands have been prepared. They are of the general formula Salan(Bu-t)[B(OR)](2). The compounds are Salean(Bu-t)(BOR)(2) [Salean(Bu) = (N,N'-ethylenebis(3,5-di-tert-butyl-salicylamine)), R = Me (1), SiMe3 (4)], Salban(Bu)(BOR)2[Salban(tBu) = (N,N'-butylenebis(3,5-di-tert-butyl-salicylamine)), R = Me (2), SiMe3 (5)], and Salhan(Bu-t)(BOR)2 [Salhan('Bu) = (N,N'-hexylenebis(3,5-di-tert-butyl-salicylamine)), R = Me (3)]. All of the compounds were characterized by spectroscopic (H-1 NMR, B-11 NMR, IR) and physical (mp, EA) techniques. Also, 1, 2 and 4 were structurally characterized by single crystal X-ray diffraction studies. (c) 2005 Published by Elsevier B.V..