Process for regenerating Pd catalysts

Details Process for regenerating Pd catalysts Process for regenerating Pd catalysts

2005-07-26

2005-07-26

Silverman, Stanley S. (Department: 1754)

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Treating with a liquid or treating in a liquid phase,...

C502S035000, C502S325000, C502S326000

Reexamination Certificate

active

06921731

ABSTRACT:
Process for regenerating a Pd catalyst after a homogeneously catalyzed C—C coupling reaction in which the Pd catalyst precipitates, is separated from the reaction mixture and subsequently treated with I2or Br2. The Pd catalyst can then be used in a subsequent reaction run.Preferably between 1 and 3 mole equivalents of I2or Br2, relative to the quantity of Pd catalyst is usedThe C—C coupling reaction is preferably carried out in the presence of a support material.The C—C coupling reaction may be for example a Heck reaction, a Suzuki reaction or a cross-coupling reaction.

REFERENCES:
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patent: 3700729 (1972-10-01), Fenton
patent: 6001768 (1999-12-01), Buysch et al.
patent: 6005151 (1999-12-01), Herrmann et al.
patent: 6071843 (2000-06-01), Buysch et al.
patent: WO 98/49128 (1998-11-01), None
Herrmann, W.A. et al., “Palladacycles as Structurally Defined Catalysts for the Heck Olefination of Chloro- and Bromoarenes” Angew. Chem. Ed. Engl. 34(17): 1844-1848 (1995).

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