(Eta3-phenylallyl)(phosphanyloxazoline)palladium complexes: X-ray crystallographic studies, NMR investigations, and Ab initio/DFT calculations.
All possible (eta(3)-allyl)palladium complexes (1-4) of the ligand (4S)-[2-(2'-diphenylphosphanyl)phenyl]-4,5-dihydro-4-(2-propyl)-oxazole (L 1) and eta(3)-allyl ligands with one to three phenyl substituents at the terminal allylic centers were synthesized and characterized by X-ray crystal structure analysis and, with respect to allylic isomers, by NMR investigations. Equilibrium geometries, electronic structures, and relative energies of isomeric complexes were computed by restricted Hartree-Fock (RHF) and density functional theory (DFT) calculations; experimentally determined isomer ratios could be reproduced. The results allowed important conclusions to be drawn regarding the mechanism of Pd-catalyzed asymmetric allylic substitutions.
Organisch-chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany. mako@nmr.mpibpc.mpg.de
Martin
M
Kollmar
Henning
H
Steinhagen
Jörg P
JP
Janssen
Bernd
B
Goldfuss
Svetlana A
SA
Malinovskaya
Jordi
J
Vázquez
Frank
F
Rominger
Günter
G
Helmchen