Abstract
In our previous investigations 1 it was shown, that the primarily formed mesylamides of the 2-aryl-amino-1,3-thiazines and thiazolines (II) suffer a thermal rearrangement in solution affording the structureisomers I by splitting off the mesyl-group of the ring-nitrogen as a cation, which migrates to the 2-amino-nitrogen. The present paper deals with the stable isotope results, which provided further evidence for the ionic-mechanism and showed the same mechanism to be valid in melts.
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