| 摘要 |
Diaryl sulphides and diaryl selenides of formula: Ar-X-Ar where X=S or Se and Ar=aryl are made by the action of sulphur and sulphur dioxide or selenium and selenium dioxide on a compound of formula: Ar-H The process is especially useful for the preparation of phenothiazines of formula <IMAGE> in which X=S or Se and Z and Z1, which may be identical or different, are each hydrogen, halogen, alkyl or alkoxy.
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