C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/529.5
C07C 51/12 (2006.01) C07C 51/353 (2006.01) C07C 53/08 (2006.01)
Patent
CA 1252480
- 33 - ABSTRACT A process for the production of organic carboxylic anhydrides by the catalytic reaction of organic formate esters in contact with carbon monoxide and a homogeneous catalyst system of a rhodium metal atom, a phosphorus-containing ligand in which there is present at least one oxo oxygen atom attached to a phosphorus atom or a carbon atom to form a Z group and the ? or ? group in said Z group is located at least one carbon atom removed from the phosphorus atom of the molecules represented by the formulae. Image (V) or Image (VI) and a halogen source, under mild reaction conditions, wherein R' is hydrogen,aryl or aralkyl, and wherein 1 or more of said R' groups can be substituted with a Z group but not more than 3 of said R' groups in the molecule are so substituted; a is an integer from 0-4; b is an integer from 0-3; and Z is P(O)R'R'; -C(O)OR" or C(O)R", wherein R" is R' or -H.
486417
Sim & Mcburney
Union Carbide Corporation
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