Preparation of thiazine derivatives.

摘要

A method for the prepearation of a thiazine derivative, having insecticidal properties, of the formula
<Chemistry id="chema01" num="0001"><Image id="ia01" he="38" wi="36" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>where each R is hydrogen or an appropriate aromatic or aliphatic substituent and X is hydrogen, halogen or lower alkyl, the method comprising reacting together a sulphur donor, a compound of the formula Y<Sub>2</Sub>C=CXN0<Sub>2</Sub> where Y is halogen (preferably chlorine) or another appropriate leaving group and a compound of the formula
<Chemistry id="chema02" num="0002"><Image id="ia02" he="7" wi="43" file="IMGA0002.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>