Process for the preparation of aromatic carboxylic acids

Details Process for the preparation of aromatic carboxylic acids Process for the preparation of aromatic carboxylic acids

1989-06-05

1992-01-14

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546147, 546170, 546315, 546326, 548441, 548492, 548531, 548532, 548533, 549 23, 549484, 549485, 549486, 549468, 549 58, 562480, 562490, 562493, C07D21904, C07D20982, C07D35504

Patent

active

050812521

ABSTRACT:
A process for the preparation of aromatic carboxylic acids or their salts comprises heating carboxyl-free aromatic compounds and aromatic carboxylic acid salts whose basic structures differ from those of the aromatic compounds, or heating polycyclic aromatic compounds with three or more rings and monocyclic or bicyclic aromatic carboxylic acid salts, under carbon dioxide pressure in the presence of one or more metal compounds selected from group (a) of compounds of zinc, cadmium, and thallium and one or more compounds selected from group (b) of compounds of cesium, Group II metals, And Group IIIa metals to effect the intermolecular transfer of the carboxyl groups.

REFERENCES:
patent: 2823231 (1958-02-01), Raecke et al.
patent: 3023216 (1962-02-01), Blaser et al.
patent: 3043846 (1962-07-01), Blaser et al.
Raecke, B., "Synthese von Di-und Tricarbonsauren Aromatischer Ringsysteme durch Verschiebung von Carboxyl-Gruppen", Angewandte Chemie, vol. 70, No. 1 (Jan. 7, 1958), pp. 1-5.
Raecke, B., et al., "2,6-Naphthalenedicarboxylic Acid", Organic Synthesis, vol. 5 (1973), pp. 813-817.
Yamashita, Junzo et al., "Studies on Aromatic Carboxylic Acids II; Synthesis of 2,6-Naphthalenedicarboxylic Acid by Henkel Process", Organic Synthetic Chemistry, vol. 20, No. 5 (1962), pp. 501-506.
McNelis, Edward; "Reactions of Aromatic Carboxylates, II, The Henkel Reaction", Journal of Organic Chemistry, vol. 30 (1965), pp. 1209-1213.

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