Preparation of citraconic anhydride

Details Preparation of citraconic anhydride Preparation of citraconic anhydride

1995-01-30

1997-09-23

Shah, Mukund J.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549262, C07D30760

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active

056706596

ABSTRACT:
Citraconic anhydride is prepared in a single step by heating itaconic acid, optionally in an inert organic solvent medium, in the presence of a catalytically effective amount of an at least partially organic acid/base catalyst compound having a pKa ranging from 4 to 10, in particular a salt catalyst such as pyridinium tosylate, itaconate or hydrochloride, ammonium itaconate, or phosphinium hydrobromide.

REFERENCES:
patent: 3833619 (1974-09-01), Baumann et al.
patent: 4639531 (1987-01-01), Baumann et al.
El-Anani, A. et al. J. Chem. Soc., Perkins Trans. II, pp. 1072-1077 (1973).
Katritzky, A.R. et al. Comprehensive Heterocyclic Chemistry vol. 2. (Pergamon Press, Oxford) p. 197 (1984).
Galanti, A.V. et al. J. Polymer Sci., Polymer Chem. Ed., vol. 19, pp. 2243-2253 (1981).
Journal of Polymer Science, Polymer Chemistry Edition, vol. 19, 1981, New York, pp. 2243-2253 - A.V. Galanti et al, "Mechanism of Amine . . . ", p. 2243, p. 2249, table 1.

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