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:
Jun. 08, 2010
Filed:
Apr. 07, 2005
Ambuja Pande, Madhya Pradesh, IN;
Ramesh Chandra Malhotra, Madhya Pradesh, IN;
Kumaran Ganesan, Madhya Pradesh, IN;
Krishnamurthy Sekhar, Madhya Pradesh, IN;
Vinita Dubey, Madhya Pradesh, IN;
Ambuja Pande, Madhya Pradesh, IN;
Ramesh Chandra Malhotra, Madhya Pradesh, IN;
Kumaran Ganesan, Madhya Pradesh, IN;
Krishnamurthy Sekhar, Madhya Pradesh, IN;
Vinita Dubey, Madhya Pradesh, IN;
Director General, Defence Research & Development Organisation, New Delhi, IN;
Abstract
An improved process for the preparation of 2-chlorobenzylidenemalononitrile (CS) comprising of the steps of: preparing malononitrile suspension by adding 5-20% (wt %) preferably 12-14% malononitrile to water while constantly stirring and then adding 0.05-0.5% (v/v) preferably 0.1-0% of a catalyst like piperidine, pyridine, 2-picoline, 3-picoline, 4-picoline or morpholine preferably piperidine piperidine with constant stirring at 20-30° C.; condensing the malononitrile suspension prepared in step (a) with 2-chlorobenzaldehyde by adding 10-15% (w/v) preferably 25-30%, of 2-chlorobenzaldehyde cover a period at 30-45 minutes so that the temperature of the reaction mixture remains below 50° C., constantly stirring for 20-40 minutes, then filtering the CS and drying it at 20-30° C. under water vacuum for 3-5 hrs.