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:
Oct. 02, 2018
Filed:
May. 10, 2016
Process for preparing (e)-(5,6-dihydro-1,4,2-dioxazin-3-yl)(2-hydroxyphenyl)methanone o-methyl oxime
Arysta Lifescience Corporation, Tokyo, JP;
Vic Prasad, Leawood, KS (US);
Cameron Gibb, Apex, NC (US);
Christopher Lynn Larson, Cary, NC (US);
A. Sai Srikanth, Kurnool, IN;
Jivan Dhanraj Pawar, Bangalore, IN;
Sankar Balakrishnan, Tamilnadu, IN;
K. N. Ravikumar, Bangalore, IN;
Avinash Shesharo Mane, Bangalore, IN;
Sagi Sateesh, Andhra Pradesh, IN;
Sampadarao Ananda Rao, Andhra Pradesh, IN;
Arysta LifeScience Corporation, Tokyo, JP;
Abstract
A process for preparing (E)-(5,6-dihydro-1,4,2-dioxazin-3-yl)(2-hydroxyphenyl)methanone O-methyl oxime is described which includes: (i) reacting benzofuran-3(2H)-one O-methyl oxime (1) with at least one nitrite selected from n-butyl nitrite and tert-butyl nitrite, in the presence of a metal alkoxide to form (2Z,32)-2,3-benzofuran-dione O3-methyl dioxime (2) as the predominant isomer; (ii) reacting the (2Z,3Z)-2,3-benzofuran-dione O-methyl dioxime (2) with 2-haloethanol to form (2Z,3Z)-benzofuran-2,3-dione 02-(2-hydroxyethyl) O3-methyl dioxime (3); and (iii) reacting the (2Z,3Z)-benzofuran-2,3-dione 02-(2-hydroxyethyl) & -methyl dioxime (3) with an acid to form (E)-(5,6-dihydro-1,4,2-dioxazin-3-yl)(2-hydroxyphenyl)methanone (9-methyl oxime (4);