Ortho-Palladated Phenol Derivatives
Organometallics, Vol. 23, No. 19, 2004 4415
dium complexes resulting after the insertion of an
alkene into an acyl- or aryl-palladium bond have been
isolated.12 In this paper, we study the reactions of
insertion into the C-Pd bond of some ortho-palladated
phenol derivatives and the isolation of the products of
monoinsertion of 1,5-cyclooctadiene, the polyinsertion
of norbornadiene, norbornene and dicyclopentadiene,
and also the insertion of carbon monoxide followed by
the polyinsertion of norbornadiene and norbornene. The
study of the sequential insertion of two or more unsat-
urated species is of interest, because such processes
contitute the first steps of important copolymerization
reactions. Thus, copolymerization of CO and olefins
using palladium catalysts takes place through alternat-
ing insertion of olefins and CO into the palladium-
carbon bond, and it constitutes a promising source of
very interesting polymers.8,13,14
isocyanides28 or with 2,6-dimethylphenyl isocyanide
followed by AgBF4 and acetylene.29 Recently reported
syntheses of mappicines and the potent anticancer
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Palladium-catalyzed organic syntheses involving aryl
halides or triflates and alkynes constitute very useful
routes of preparation, for example, of carbacycles or
heterocycles.9,15-18 In these reactions, alkenylpalladium
complexes are intermediates that, in some cases, can
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