Abstract
In this paper it is reported the synthesis of the complexes of the type
\Ph2PCH2PPh2CH=C(O)RPdCl2\ (R=4'-biphenyl (1), OCH2Ph (2),
4-methylphenyl (3), 2-naphtyl (4), 2,4-dichlorophenyl (5), 3-nitrophenyl
(6)) derived from the reactions of the
dichloro(1,5-cyclooctadiene)palladium(II) with related phosphorus ylides
in dichloromethane under mild conditions. These compound have been
characterized by, elemental analysis and spectroscopic methods. The
structure of complex 1 has been characterized crystallographically. This
structure consists of five-membered ring formed by coordination of the
ligand through the phosphine group and the ylidic carbon atom to the
metal center. The coordination geometry around the Pd atoms in this
complex can be defined as slightly distorted square planar. At a
supramolecular level C -H center dot center dot center dot Cl and C-H
center dot center dot center dot pi intermolecular interactions are
responsible for the crystal packing. This complex has been found to act
as efficient catalysts for the Suzuki cross-coupling reaction. Various
aryl bromides were coupled with aryl boronic acids in DMF, under air, in
the presence of 0.2 mol\% of the catalyst to afford corresponding cross-
coupled products in good to excellent yields. (C) 2012 Elsevier B.V. All
rights reserved.
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