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. 22, 2008
Filed:
Jul. 08, 2005
Norman Dann, Cambridgeshire, GB;
Peter Dominic Riordan, Bristol, GB;
Mehul Rasikchandra Amin, Suffolk, GB;
Michael Mellor, Suffolk, GB;
Norman Dann, Cambridgeshire, GB;
Peter Dominic Riordan, Bristol, GB;
Mehul Rasikchandra Amin, Suffolk, GB;
Michael Mellor, Suffolk, GB;
Bayer Cropscience S.A., , FR;
Abstract
Disclosed herein is a process for the preparation of a compound of the formula (II): or a salt thereof, wherein X is halogen; each Y, which may be the same or different, is halogen, haloalkyl, alkoxycarbonyl or alkylsulphonyl, and n is 0 to 3;which process comprises treating a compound of the formula (III): with a cyanide source and a catalyst selected from the group consisting of a tetraalkyl ammonium salt and a tetraalkyl phosphonium salt in an aqueous solvent or without solvent, wherein:X is halogen; each Y, which may be the same or different, is halogen, haloalkyl, alkoxycarbonyl or alkylsulphonyl: and n is 0 to 3; and wherein the cyanide source is hydrogen cyanide, an alkali metal cyanide, an alkaline earth metal cyanide or an optionally substituted ammonium cyanide.