Halides oxidative-addition

With aryl halides oxidative addition is often the rate-determining step this is promoted by appropriate ligands such as triarylphosphines. Finely divided palladium metal or ligand-free palladium, prepared in situ by reduction of palladium(II) species, can also be used in weak donor media. Palladium(0) with a triarylphosphine as ligand reacts with aryl halides in the order Arl > ArBr> ArCl. Electron-withdrawing groups on the aryl halide increase the reactivity... [Pg.174]

Systems for which suggestions of intermediate Pd(IV) species formed by aryl halide oxidative addition have been proposed include reactions such as that of Scheme 9 developed by Catellani, Chinsoli and and de Meijere... [Pg.199]

Systems for which Pd(II)-Pd(IV) cycles are consistent with model reactions involve alkyl halide oxidative addition or oxidation by strong inorganic oxidants. Thus, the reaction of Scheme 10 may be explained by a process very similar to that for Scheme 9 but involving alkyl halide (RT) addition modeled by formation of 27 and its decomposition to 28, cyclization and repetition of this process, and subsequent elimination of norbomene.t In this proposal the sequence for the alkylation of the ortho positions of the aryl group in the intermediate Pd(QH4—C7Hio-C,C )L,2, involving... [Pg.200]

Detailed Studies on the Mechanism of Organic Halide Oxidative Addition 111... [Pg.111]

Detailed Studies on the Mechanism ofOrganIc Halide Oxidative Addition 113... [Pg.113]

Detailed Studies on the Mechanism ofOrganic Halide Oxidative Addition 1117... [Pg.117]

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