Preparation of sulphoalkyl quaternary salts
US4287348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1978 |
| Grant date | Sep 1, 1981 |
| Priority date | — |
| Expiry date | Jun 5, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D293/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Sulphoalkyl quaternary salts of the formula ##STR1## wherein X is --O--, --Se--, --S--, --NR-- or --CR(R)--, R is hydrogen or alkyl, R.sub.1 is hydrogen, methyl or ethyl, R.sub.2 and R.sub.3 are each hydrogen or substituents or together represent the atoms necessary to complete an optionally substituted benzene ring, R.sub.4 is optionally substituted alkylene of 3 or 4 carbon atoms and n is 1 or 0, except that when n is 1, R.sub.1 cannot be hydrogen, are prepared by heating at a temperature above 80.degree. C. a heterocyclic base of the formula ##STR2## wherein X, R.sub.1, R.sub.2, R.sub.3 and n have the indicated meanings with a hydroxysulphonic acid of the formula HOR.sub.4 SO.sub.3 H.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.