Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid anhydrides
Reexamination Certificate
2006-01-10
2006-01-10
Zucker, Paul A. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid anhydrides
C562S890000
Reexamination Certificate
active
06984755
ABSTRACT:
A process for the preparation of an carboxylic anhydride by reaction of an ethylenically unsaturated compound with carbon monoxide and an carboxylic acid in the presence of a catalyst involving:a) a source of a group VIII metal;b) a bidentate diphosphine of formula I, wherein R1represents a bivalent radical that together with the phosphorus atom to which it is attached is an optionally substituted 2-phospha-tricyclo[3.3.1.1 {3,7}]-decyl group or a derivative thereof in which one or more of the carbon atoms are replaced by heteroatoms (“2-PA” group); wherein R2and R3independently represent univalent radicals of up to 20 atoms or jointly form a bivalent radical of up to 20 atoms; and wherein R represents a bivalent organic bridging group; and,c) a complexing anion; wherein the complexing anion is the anion of the carboxylic acid. A process wherein the carboxylic acid is prepared in-situ and use of the carboxylic anhydride as an acylation agent.
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Drent Eit
Pugh Robert Ian
Van Der Made Renata Helena
Shell Oil Company
Zucker Paul A.
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