Preparation of .alpha., .beta.-unsaturated carboxylic acids and

Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof

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C07C 5100

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057103283

ABSTRACT:
Disclosed is a process for the preparation of .alpha.,.beta.-unsaturated carboxylic acids and anhydrides thereof which comprises contacting formaldehyde or a source of formaldehyde with a carboxylic anhydride in the presence of a catalyst comprising mixed oxides of vanadium, phosphorus and, optionally, a third component selected from titanium, aluminum or, preferably silicon.

REFERENCES:
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patent: 4581471 (1986-04-01), Barlow et al.
M. Ai, J. Catal., 107, 201 (1987) Apr. 1987.
M. Ai, J. Catal., 124, 293 (1990).
M. Ai, Appl. Catal., 36, 221 (1988).
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M. Ai, Bull. Chem. Soc. Jap., 63, 1217 (1990).
M. Ai, Bull. Chem. Soc. Jap., 63, 3722 (1990).
M. Ai, Appl. Catal., 48, 51 (1989, primarily catalyst preparation).
E.G. Hancock, "Catalyst Types of Interest in the Oxidation of Propylene to Acrylic Acid", Propylene and Its Industrial Derivatives, Chapter 10, pp. 367-415, 1973.

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