Angelika Preetz, W. Baumann, Christian Fischer
Jun 17, 2009
Citations
0
Influential Citations
21
Citations
Journal
Organometallics
Abstract
The hydrogenation of [Rh(DIPAMP)(NBD)]BF4 (DIPAMP = 1,2-bis[(2-methoxyphenyl)(phenylphosphino)]ethane, NBD = 2,5-norbornadiene) in methanol leads not only to the formation of the expected solvate complex [Rh(DIPAMP)(MeOH)2]BF4 but also to the arene-bridged dimeric species [Rh(DIPAMP)]2(BF4)2. The dimer is characterized by X-ray analysis as well as by an extensive NMR solution study including 1H, 31P, and 103Rh NMR. When used as a precursor for the asymmetric hydrogenation of prochiral olefins, [Rh(DIPAMP)]2(BF4)2 operates without induction periods. It can be used for the formation of catalyst−substrate complexes such as [Rh(DIPAMP)(MAC)]BF4 (MAC = methyl (Z)-α-acetamidocinnamate).