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M 5 4WT 2-(2-Nitrophenyl) benzothiazole, produced by deoxygenation of the corresponding nitro-compound or by thermolysis or photolysis of the related azide, gives indazolo [3,2-61 benzothiazole by attack on the benzothiazole nitrogen. Similar attack of the nitrene in 2-(2-nitrophenyl) benzimidazoles gives benzimidazoindazoles in good yield. However, with an appropriate l-substituent in the benzimidazole (e.g. M e or CHMe,) the nitrene in its triplet state (generated by acetophenone-sensitised photolysis or by thermDlysis of the azide bearing a 4-dimethylamino-group) preferentially attacks this substituent giving benzimidazoquinazolines.

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