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Tripod‐Rhodium‐COD‐Komplexe: Synthese, Struktur, Dynamik und Katalyse
Author(s) -
Scherer Johannes,
Huttner Gottfried,
Walter Olaf,
Janssen Bernd Christian,
Zsolnai Laszlo
Publication year - 1996
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19961291230
Subject(s) - chemistry , rhodium , tripod (photography) , intramolecular force , catalysis , stereochemistry , cyclooctadiene , crystallography , medicinal chemistry , organic chemistry , physics , optics
Tripod Rhodium COD Complexes: Synthesis, Structure, Dynamics and Catalysis The reaction of the tripod ligands R′C(CH 2 PR 2 ) 3 ( 1a–c ) and X 2 POCH[CH 2 P(Ph) 2 ] 2 ( 2a–c ) with [Rh I (COD)Cl] 2 ] is investigated. It yields tripod rhodium COD complexes [( 1a–c )Rh I (COD)]Y ( 3a–c ) and [( 2a–c )Rh I (COD)]Y [ 4a–c ; Y = B(Ph) 4 , PF 6 ]. The tripod ligand is coordinated by all three donor groups in each case, irrespective of the different donor capabilities of the coordinating groups. The solid state structure of compounds 3a–c and 4a is determined by X‐ray analysis. The observed coordination polyhedra delineate the variation from the idealized trigonal bipyramide to an idealized quadratic pyramide. In solution the analysis of the NMR spectra shows a rapid intramolecular interconversion according to a turnstile pseudo rotation. The complexes 3a and 4a are found to be catalysts for the hydrogenation of prochiral olefines.