Palladium co-ordination chemistry of β-diimines: a preparative and structural comparison with α-diimines
作者:Elaine K. Cope-Eatough、Francis S. Mair、Robin G. Pritchard、John E. Warren、Rebecca J. Woods
DOI:10.1016/s0277-5387(03)00123-2
日期:2003.6
The co-ordination chemistry of beta-diimines has been found to be markedly different from otherwise identical alpha-diimines, it being significantly more difficult to prepare stable complexes of a variety of transition metal species. Where such species were preparable, the ligands were found to be incapable of stabilising metal-alkyl bonds, in marked contrast to their alpha-diimine counterparts. These differences are ascribed to a combination of steric, entropic and electronic factors. Crystal structures of 2-Pr-i-C6H4NCMeCMe2C-MeN-2-Pr-i-C,H-4, 2,6-Pr-2(i)-C6H3NCMeCMeN-2-Pr-i-C6H4, [2-P-r(i)-C6H4NCMeCMe2CMeN-2-P-r(i)-C6H4PdCl2] and (2,6-Pr-2(i)-C6H3NCMeCMeN-2,6-P-r(i)-C6H3PdCl2] are reported. A partial structure of [2,6-P-r(i)-2-C6H3NCMeCMe2CMeN-2,6-P-r(i)-C6H3Pd2Cl4] is also briefly discussed. (C) 2003 Elsevier Science Ltd. All rights reserved.