Catalyst for the production of 2,2-disubstituted propiolactones

Details Catalyst for the production of 2,2-disubstituted propiolactones Catalyst for the production of 2,2-disubstituted propiolactones

1977-04-25

1978-05-30

Dees, Carl F.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252413, 252456, B01J 2908, B01J 2916, B01D 1506

Patent

active

040922707

ABSTRACT:
The present invention relates to a process for the manufacture of 2,2-disubstituted propiolactones from isoanhydrides and formaldehyde, as shown in the following equation: ##STR1## wherein R and R.sup.1 individually may be a straight- or branched-chain alkyl, aryl or aralkyl group having 1 to 10 carbon atoms. The reaction is conducted at a temperature of from about 190.degree. C. to about 400.degree. C. in the presence of the metal oxide-silica gel complex which results from heating the calcined residue of a salt of a metal selected from the group consisting of Ta, Ti, Nb and Zr supported upon a silica gel in the presence of nitrogen and steam at a temperature of from about 650.degree. C. to about 1000.degree. C. which complex has additionally been treated by soaking in a mineral acid at a temperature of from about 25.degree. C. to about 100.degree. C. for from about 1 to about 4 hours.

REFERENCES:
patent: 2439852 (1948-04-01), Jackson
patent: 2704281 (1955-03-01), Appell
patent: 2853454 (1958-09-01), Mills

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