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:
Aug. 17, 2010
Filed:
Apr. 25, 2006
Keki Hormusji Gharda, Mumbai, IN;
Ashokkumar Maganlal Malte, Thane, IN;
Pulinattu Cherian Joseph, Thane, IN;
Sureshkumar Dattatraya Parkar, Ambarnath, IN;
Shekhar Vishwanath Sathe, Dombivli, IN;
Pragnesh Dalpatram Damania, Mumbai, IN;
Keki Hormusji Gharda, Mumbai, IN;
Ashokkumar Maganlal Malte, Thane, IN;
Pulinattu Cherian Joseph, Thane, IN;
Sureshkumar Dattatraya Parkar, Ambarnath, IN;
Shekhar Vishwanath Sathe, Dombivli, IN;
Pragnesh Dalpatram Damania, Mumbai, IN;
Gharda Chemicals Limited, Dombivli, Maharashtra, IN (US);
Abstract
This invention relates to a process for the preparation of 5-amino-1-phenyl-3-cyano-4-trifluoromethyl sulphinyl pyrazoles as defined by Formula-I, wherein: R1=trifluoromethyl or trifluoromethoxy, and R2, R3=individually hydrogen, chlorine or bromine, the process comprising the step of oxidizing a compound of Formula-II, wherein: R1=trifluoromethyl or trifluoromethoxy, and R2, R3=individually hydrogen, chlorine or bromine, in a medium comprising at least one oxidizing agent and trichloro acetic acid, and/or the reactions product (s) of the at least one oxidizing agent and trichloro acetic acid, and at least one melting point depressant. The preferred pyrazole is Fipronil, preferably prepared using hydrogen peroxide and dichloro acetic acid at room temperature.