Syngenta Crop Protection, Inc.

Peter Mainenfisch

Thomas Pitterna

Henry Szczepanski

Anthony Cornelius O'Sullivan

Thomas Rapold

Marcel Senn

Thomas Gobel

Ottmar Franz Huter

A process is provided for preparing compounds having the general formula I wherein R is a range of organic groups and X is a leaving group. The process comprises reacting a compound of formula II with a water-removing reagent. When X is halogen or a sulfonate, the compound of formula I may be prepared by reacting a compound of the formula III with a halogenating agent or a sulfonylating agent. Alternatively, when X is halogen, the compound of formula I can be prepared by reacting a compound of the formula IV where R2 and R2 are defined organic groups, with a compound of the formula halogen-C(&#x2014;O)&#x2014;O&#x2014;C1-C8alkyl, halogen-C(&#x2014;O)&#x2014;O-aryl or halogen-C(&#x2014;O)&#x2014;O-benzyl.

Preparation of thiazoles

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Stein, Switzerland

Peter Mainenfisch