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US 6,548,698 B1Granted
Oxidative carbonylation of toluene catalyzed by rhodium and iridium
AssigneeE. I. Du Pont de Nemours and Company
InventorsVladimir Grushin, David Lincoln Thorn
Life of this patent
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Abstract
This invention relates generally to the oxidative carbonylation of toluene, catalyzed by rhodium or iridium complexes in the presence of an oxidant and under mild conditions, whereby toluic acid is produced with para-selectivity up to 98%.
Claims23
A para-selective process for preparing toluic acid, comprising:
- combining
- toluene,
- carbon monoxide having a pressure from about 0 psi to about 5000 psi, and
- an oxidant selected from the group consisting of O2, air, MxM′yS2O8.zH2O, where M and M′ are cations selected from the group consisting of Li, Na, K, Rb, Cs, and H and wherein x+y=2, and z is any number from 0 to about 10, hydrogen peroxide and trifluoroperacetic acid;
- with a rhodium catalyst, in an acid medium and in the absence of a copper promoter.
2 more elements
A para-selective process for preparing toluic acid, comprising:
- combining toluene, carbon monoxide, and MxM′yS2O8.zH2O, where M and M′ are cations selected from the group consisting of Li, Na, K, Rb, Cs, and H and wherein x+y=2, and z is any number from 0 to about 10, with an iridium catalyst, in an acid medium.
A para-selective process for preparing toluic acid, comprising:
- combining toluene, carbon monoxide, and an oxidant selected from the group consisting of O2, air, MxM′yS2O8.zH2O, where M and M′ are cations selected from the group consisting of Li, Na, K, Rb, Cs, and H and wherein x+y=2, and z is any number from 0 to about 10, hydrogen peroxide and trifluoroperacetic acid, with a catalyst consisting essentially of an iridium compound, in an acid medium.
Dependencies are inferred from the claim text.