2.1.3- Benzoselenadiazole N-oxides

Benzoselenadiazole-N-oxide (210) was prepared by Pedersen through the reaction of o-benzoquinone dioxime (209) with selenium monochloride [Eq. (50)]. 

Benzoselenadiazole N-oxide in methylene chloride irradiated with a Hano-via Q-700 immersion lamp and a satd. soln. of anthracene in acetone as filter benzofurazan. Y 96%. C. L. Pedersen, Chem. Commun. 1974, 704. ... 

The selenium analogue of (13) has been generated by the photolysis of 2,1,3-benzoselenadiazole 1-oxide and identified as a transient species, having the structure (14), by u.v. spectroscopy. Compound (14) gives the selenium analogue of (7 R = N=S=S) as another transient species upon treatment with Seg, generated by flash photolysis (see also Chap. 6, p. 295). 

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