The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 29, 1986
Filed:
Feb. 16, 1984
Lorenz Heiss, Hofheim am Taunus, DE;
Hoechst Aktiengesellschaft, , DE;
Abstract
A process for preparing 4,4'-bis-benz-ox(-thi,-imid)-azol-2-yl-stilbenes of the formula ##STR1## wherein R, R.sup.1, R.sup.2 and R.sup.3 may be the same or different from each other and denote hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -alkoxycarbonyl, chlorine, bromine, nitro or sulfo and X denotes oxygen, sulfur or NH, which comprises reacting a (4-chloromethyl)-iminobenzoic acid alkyl ester of the formula ##STR2## wherein R denotes C.sub.1 -C.sub.4 -alkyl or C.sub.1 -C.sub.4 -alkoxyethyl, or HCl salts thereof, with o-aminophenol, o-aminothiophenol or o-phenylene diamine and reacting the resulting 2-benz-ox(-thi,-imid)-azolyl-4-chloromethyl-benzenes with potassium hydroxide or sodium hydroxide in a polar aprotic solvent.