Invention Grant
- Patent Title: Process for the preparation of 2,4- or 2,6-dihalogeno-aniline
- Patent Title (中): 制备2,4-或2,6-二卤代苯胺的方法
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Application No.: US799918Application Date: 1991-11-26
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Publication No.: US5145958APublication Date: 1992-09-08
- Inventor: Wolfram Kissener , Helmut Fiege
- Applicant: Wolfram Kissener , Helmut Fiege
- Applicant Address: DEX Leverkusen
- Assignee: Bayer Aktiengesellschaft
- Current Assignee: Bayer Aktiengesellschaft
- Current Assignee Address: DEX Leverkusen
- Priority: DEX3933093 19891004
- Main IPC: C07C209/68
- IPC: C07C209/68 ; C07C209/74 ; C07C211/52
Abstract:
2,4- or 2,6-dihalogeno-aniline can be prepared by reacting an amino-benzoic acid ester of the formula ##STR1## in which R.sup.1, R.sup.2 and R.sup.3 have the meanings indicated in the description, with 2-2.5 moles of a chlorinating or brominating agent in an inert reaction medium at a temperature of 40.degree.-160.degree. C. and subsequently hydrolyzing and decarboxylating the dihalogenated amino-benzoic acid ester.
Public/Granted literature
- US4845041A Atomic-absorption sputtering chamber and system Public/Granted day:1989-07-04
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