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
- 专利标题: Process for the preparation of .DELTA..sup.4 -1,3,4-oxadiazolin-2-one compounds
- 专利标题(中): 制备DELTA 4-1,3,4-恶二唑啉-2-酮化合物的方法
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申请号: US556715申请日: 1983-11-30
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公开(公告)号: US4563532A公开(公告)日: 1986-01-07
- 发明人: Udo Eckstein
- 申请人: Udo Eckstein
- 申请人地址: DEX Leverkusen
- 专利权人: Bayer Aktiengesellschaft
- 当前专利权人: Bayer Aktiengesellschaft
- 当前专利权人地址: DEX Leverkusen
- 优先权: DEX3245202 19821207
- 主分类号: C07D271/10
- IPC分类号: C07D271/10 ; C07D271/113 ; C07D413/10 ; C09B57/00
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.