Patents by Inventor David John Wadsworth

David John Wadsworth has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • PROCESS FOR THE PREPARATION OF 2-CHLORO-5-CHLOROMETHYL-THIAZOLE
    Publication number: 20110306772
    Abstract: The invention relates to a process for the preparation of 2-chloro-5-chloromethyl-thiazole, which is employed as intermediate in the preparation of compounds having a pesticidal action, which process comprises reacting a compound of formula (II), in free form or in salt form, (III), (IV), (V) or (VI) with a chlorinating agent, where R and M+ are as defined in claim 1; to the compounds of the formulae (III) and (IV), which are used in this process as intermediates; and to the use of, and a process for the preparation of, the compounds of the formulae (III) and (IV).
    Type: Application
    Filed: August 22, 2011
    Publication date: December 15, 2011
    Applicant: Syngenta Crop Protection LLC
    Inventors: Anthony Cornelius O'Sullivan, Laurenz Gsell, Rudolf Naef, Marcel Senn, Thomas Pitterna, David John Wadsworth
  • Process for the preparation of 2-chloro-5-chloromethyl-thiazole
    Patent number: 8013167
    Abstract: The invention relates to a process for the preparation of 2-chloro-5-chloromethyl-thiazole, which is employed as intermediate in the preparation of compounds having a pesticidal action, which process comprises reacting a compound of formula (II), in free form or in salt form, (III), (IV), (V) or (VI) with a chlorinating agent, where R and M+ are as defined in claim 1; to the compounds of the formulae (III) and (IV), which are used in this process as intermediates; and to the use of, and a process for the preparation of, the compounds of formulae (III) and (IV).
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: September 6, 2011
    Assignee: Syngenta Crop Protection, Inc.
    Inventors: Anthony Cornelius O'Sullivan, Laurenz Gsell, Rudolf Naef, Marcel Senn, Thomas Pitterna, David John Wadsworth
  • Process for the preparation of thiazole derivatives
    Patent number: 6265585
    Abstract: A process for the preparation of a compound of formula (I), wherein X is a leaving group; which process comprises, a) for the preparation of a compound of formula (I) wherein X is —OS(═O)2A and A is as defined in the specification, reacting a compound of formula (II) with a sulfonylating agent; or, b) for the preparation of a compound of formula (I) wherein X is iodine, reacting a compound of formula (III) with an iodinating agent, preferably sodium iodide; or, c) for the preparation of a compound of formula (I) whrein X is bromine, reacting a compound of formula (IV) with a brominating agent; or, d) for the preparation of a compound (I) wherein X is chlorine or bromine, reacting a compound (V), wherein R and X are as defined in the specification, with a chlorinating agent, a compound of formula (Ib), the use thereof and a process for the preparation of a compound of formula (II) and a compound of formula (A) are described.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: July 24, 2001
    Assignee: Syngenta Crop Protection, Inc.
    Inventors: Thomas Pitterna, Peter Maienfisch, David John Wadsworth, Laurenz Gsell, Thomas Rapold, Henry Szczepanski