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:
Jan. 17, 1984
Filed:
Feb. 05, 1982
Karlfried Dickore, Leverkusen, DE;
Engelbert Kuhle, Bergisch-Gladbach, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
Herbicidal 1-amino-1,3,5-triazine-2,4(1H, 3H)-diones of the general formula ##STR1## are obtained in good yields if an N-substituted O-aryl N-chlorocarbonyl carbamate of the general formula ##STR2## is reacted with an isothiosemicarbazone of the general formula ##STR3## or hydrohalide thereof, (R.sup.1 to R.sup.4 in formulae (I) to (III) having the meanings given in the description), at a temperature between 0.degree. and 50.degree. C., in the presence of an acid-binding agent, the open-chain intermediate products formed thereby are then heated (if appropriate without intermediate isolation), in a second stage, to a temperature between 50.degree. and 150.degree. C. and, finally, in a third stage, the 1-alkylideneamino-1,3,5-triazine-2,4(1H, 3H)-dione formed thereby is hydrolyzed (if appropriate again without intermediate isolation) in an acid medium.