Production of 2,2-disubstituted propiolactones
US3931237A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 23, 1974 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Jul 23, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J23/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.