Production of 2,2-disubstituted propiolactones
US4024080A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1975 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Sep 2, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J21/08
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention relates to a process for the manufacture of 2,2-disubstitued 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 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.