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:
Mar. 16, 2010
Filed:
Sep. 08, 2004
Govind Singh, Noida, IN;
Paramvir Bhadwal, Noida, IN;
Sanjay Jaiswal, Noida, IN;
Dinesh R. Panchasara, Noida, IN;
Rajesh Kumar Thaper, Noida, IN;
Sushil Kumar Dubey, Noida, IN;
Jag Mohan Khanna, Noida, IN;
Govind Singh, Noida, IN;
Paramvir Bhadwal, Noida, IN;
Sanjay Jaiswal, Noida, IN;
Dinesh R. Panchasara, Noida, IN;
Rajesh Kumar Thaper, Noida, IN;
Sushil Kumar Dubey, Noida, IN;
Jag Mohan Khanna, Noida, IN;
Jubilant Organosys Limited, Noida, IN;
Abstract
The present invention relates to an improved and industrial friendly process for lactonization to produce compound of the Formula [I], from compound of the Formula [II] in presence of an inorganic compound as a suitable lactonizing agent, preferably alkali metal hydrogen sulfate, and crystallizing the obtained lactone product in a solvent; or treating compound of the Formula [II] in the presence of an inorganic compound preferably alkali metal hydrogen sulfate using phase transfer catalyst in heterogeneous phase followed by crystallizing the obtained lactone product in a solvent.