2-benzothiazin-4-one 1,1-dioxide (X; R = Ph or Me). Toluene-p-sulphonic acid effects a similar cyclisation but the thiazine dioxides are in this case accompanied by benzisothiazole derivatives (XIII; R = Ph or Me). Thermolysis of the diazo-ketones also provides the thiazine dioxides along with their 3-oxo-isomers (XIX) arising by cyclisation of the keten which is the product of Wolff rearrangement. Photolysis
邻重氮乙酰基
苯磺酰氯与
苯胺和
甲胺反应,生成相应的磺酰胺(VIII; R = Ph或Me)。用
甲酸使重
氮酮环化,分别得到2,3-二氢-2-苯基-和-2-甲基-4 H -1,2-苯并
噻嗪-4-酮1,1-二氧化物(X; R = Ph或Me)。
甲苯对
磺酸具有类似的环化作用,但在这种情况下,
噻嗪二氧化物伴有苯并
异噻唑衍
生物(XIII; R = Ph或Me)。重
氮酮的热解还提供了
噻吩二氧化物及其3-氧代异构体(XIX),后者是由酮基环化而产生的,而酮基是沃尔夫夫重排的产物。邻重氮乙酰基N的光解-甲基苯磺酰胺仅导致Wolff重排产物。