Process for the preparation of .DELTA..sup.4 -1,3,4-oxadiazolin-2-one compounds
US4563532A · kind A · utility
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Key dates
| Filing date | Nov 30, 1983 |
| Grant date | Jan 7, 1986 |
| Priority date | — |
| Expiry date | Nov 30, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D413/10
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Optical brighteners of the formula ##STR1## wherein Y denotes a carbocyclic or heterocyclic radical, PA1 R denotes hydrogen or R.sub.1, wherein PA1 R.sub.1 is an optionally substituted alkyl, aralkyl or aryl radical, and PA1 n denotes 0 or 1 and PA1 the rings A and B can carry further substituents, are obtained in a simple manner by a process in which compounds of the formula ##STR2## are rearranged at elevated temperatures--if appropriate in the presence of acids.
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