ISOMERISM OF THE CYCLOPALLADATED FERROCENYLKETIMINES

Five new cyclopalladated ferrocenylketimines with the general formula 5)-C5H5)Fe(eta(5)-C(5)H(3)CMe=NC(6)H(4)R)(PPh(3))] (R = 2-OMe 3a, 2-OE t 3b, 2-Me 3c, 2-Br 3d, 2,4,6-trimethyl 3e) have been synthesized and characterized to be mixtures of anti and syn isomers in solution excep t for 3e. It was confirmed that the cause of this isomerism is that th e free rotation around the C-N bond is hindered. Attempts to synthesiz e ferrocenylketimines in which R = 2,6-dichloro, 2,6-dibromo, 2,4,6-tr ibromo failed to yield new products, but only obtained the condensatio n product of two molecules of acetylferrocene. Copyright (C) 1996 Else vier Science Ltd.