Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Reexamination Certificate
2004-06-28
2010-10-26
Keys, Rosalynd (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
C560S207000, C562S497000, C562S522000
Reexamination Certificate
active
07820849
ABSTRACT:
A process is provided, in particular a continuous process for the carbonylation of butadiene by reacting the butadiene with carbon monoxide and a hydroxyl group-containing compound in the presence of a palladium catalyst system in a reaction zone to form a reaction mixture, said catalyst system comprising (a) a source of palladium cations, (b) a mono-, bi- or multidentate phosphine ligand, containing at least one phosphorus atom which is directly bound to two or three aliphatic carbon atoms, as process ligand to produce a palladium-phosphine ligand complex catalyst, and (c) a source of anions, said process ligand (b) containing the moiety shown in formula (I),wherein A1and A2each represent an aliphatic carbon atom which can be connected to one or more aliphatic or aromatic carbon atoms or both A1and A2are part of an at least 5-membered ring including the phosphorus atom, and X represents an aliphatic or aromatic carbon atom which can be connected to one or more aliphatic or aromatic carbon atoms or X is part of an organic bridging group connecting another identically or differently substituted phosphorus atom, and said source of anions (c) containing a carboxylic acid and, optionally, halide ions, wherein said process ligand is fed continuously or periodically to the process as ligand make-up at a temperature 50° C. or lower.
REFERENCES:
patent: 5304674 (1994-04-01), Drent
patent: 5495041 (1996-02-01), Sielcken et al.
patent: 6737542 (2004-05-01), Drent et al.
patent: 6835850 (2004-12-01), Drent et al.
patent: WO 02/26690 (2002-04-01), None
Baur Henricus Anna Christiaan
Sielcken Otto Erik
Toth Imre
Cutliff Yate K
DSM IP Assets B.V.
Keys Rosalynd
Nixon & Vanderhye P.C.
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