Abstract
α-CF 3 S-substituted β-ketoacidamides, nitriles, thioamides and their Schiff bases are synthesised and their reactions with oxalyl chloride are investigated. As a new phenomenon the elimination of the CF 3 S group during cylcisation to substituted 2,3,5-trioxo-1,4-oxazephine (7), 4-pyrroline-2,3-dione (9) and oxalyl (10) is observed. Factors influencing this course of the reaction and mechanism of product formation are discussed.
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