发明授权
US4563532A Process for the preparation of .DELTA..sup.4 -1,3,4-oxadiazolin-2-one compounds 失效
制备DELTA 4-1,3,4-恶二唑啉-2-酮化合物的方法

Process for the preparation of .DELTA..sup.4 -1,3,4-oxadiazolin-2-one
compounds
摘要:
Optical brighteners of the formula ##STR1## wherein Y denotes a carbocyclic or heterocyclic radical,R denotes hydrogen or R.sub.1,whereinR.sub.1 is an optionally substituted alkyl, aralkyl or aryl radical, andn denotes 0 or 1 andthe 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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