Production of 2,2-disubstituted propiolactones

Details Production of 2,2-disubstituted propiolactones Production of 2,2-disubstituted propiolactones

1974-07-23

1976-01-06

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252454, 252456, C07D30512

Patent

active

039312372

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: ##SPC1##
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 a 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.

REFERENCES:
patent: 2462357 (1949-02-01), Caldwell et al.
patent: 2469704 (1949-05-01), Stone
patent: 2806064 (1957-09-01), McKlveen
patent: 3201474 (1965-08-01), Hasek et al.

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