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, 1995
Filed:
Feb. 09, 1993
Hans-Joachim Diehr, Wuppertal, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
The invention relates to a new process for the preparation of 2-chloro-5-alkylaminomethyl-pyridines of the formula (I) ##STR1## in which R represents alkyl. In this process, 2-chloro-5-aminomethyl-pyridine is reacted with formic acid at temperatures between 20.degree. C. and 200.degree. C., if appropriate in the presence of a diluent, the 2-chloro-5-formylaminomethyl-pyridine which has been formed in this process is reacted without intermediate isolation (in situ) with alkylating agents at temperatures between 0.degree. C. and 100.degree. C., if appropriate in the presence of an acid acceptor, if appropriate in the presence of a diluent, and, finally, the 2-chloro-5-(N-alkyl-N-formyl-aminomethyl)-pyridines thus formed of the general formula (V) ##STR2## in which R has the abovementioned meaning, are reacted with aqueous alkali metal hydroxide solution at temperatures between 20.degree. C. and reflux temperature, if appropriate after volatile components have been distilled off. The compounds (I) are, for example, intermediates for the preparation of insecticidally active substances.