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Palladium(II) Complexes with Benzoxazol-2-ylidene Ligands: Crystal Structures of trans-Chloro(benzoxazol-2-ylidene)- bis(triphenylphosphine)palladium(II) Chloride and cis-Diiodo(benzoxazol-2-ylidene)(triphenylphosphine)palladium(II)

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Palladium(II) Complexes with Benzoxazol-2-ylidene Ligands:

Crystal Structures of trans-Chloro(benzoxazol-2-ylidene)- bis(triphenylphosphine)palladium(II) Chloride and

cis-Diiodo(benzoxazol-2-ylidene)(triphenylphosphine)palladium(II)

F. Ekkehardt Hahn, Thomas L¨ugger, and Matthias Beinhoff

Institut f¨ur Anorganische und Analytische Chemie, Westf¨alische Wilhelms-Universit¨at M¨unster, Wilhelm-Klemm-Straße 8, D-48149 M¨unster, Germany

Reprint requests to Prof. Dr. F. E. Hahn. Fax: +49(0)251-8333108. E-mail: fehahn@uni-muenster.de Z. Naturforsch. 59b, 196 – 201 (2004); received December 22, 2003

Dedicated to Professor Ingo-Peter Lorenz on the occasion of his 60thbirthday

The palladium(II) complexes trans-[PdCl(L)(PPh3)2]Cl, 5, and cis-[PdI2(L)PPh3], 7, (L = benz- oxazol-2-ylidene) have been synthesized by treatment of the complexes trans-[PdX2(PPh3)2] (4: X = Cl, 6: X = I) with 2-(trimethylsiloxy)phenyl isocyanide 1, and subsequent hydrolysis of the Si-O bond. The crystal structures of 5 and 7∗CH2Cl2 were established by X-ray diffraction. NMR and IR studies indicate, that the unexpected cis-configuration of 7 obtained from trans-[PdI2(PPh3)2] is not the result of a solution equilibrium between the cis- and the trans-isomers.

Key words: Carbene Complexes, Palladium, Crystal Structures

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