**Mechanistic studies on the photochemical reactions of benzfurazan**. From other works it is known that irradiation of benzfurazan (**1**) in methanol gives the carbaminacid‐ester **4**, whereas in benzene the azepinederivative **3** is obtained (__Scheme 1__). The compounds **5–8** (__Scheme 2__)
Zur Photochemie des Benzfurazans
✍ Scribed by M. Georgarakis; H. J. Rosenkranz; H. Schmid
- Publisher
- John Wiley and Sons
- Year
- 1971
- Tongue
- German
- Weight
- 564 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
Irradiation of benzofurazan (1) in benzene solution yields the azepine derivative 3 as the main photoproduct. Addition of methanol in the dark to the irradiated benzene solution of 1 results in the isolation of 3 together with a new product, methyl‐1‐cis, 3‐cis‐N‐(4‐cyano‐buta‐1, 3‐dien‐1‐yl)‐carbamate (1‐cis, 3‐cis‐2). Irradiation of 1 in methanol solution gives a mixture of the stereoisomeric methyl N‐(4‐cyano‐buta‐1, 3‐dien‐1‐yl)‐carbamates, from which the 1‐trans, 3‐cis isomer of 2 could be isolated in pure form.
The observed photoproducts are formed via the reactive intermediates a, a nitrile‐(nitrile oxide), and c, a nitrene, neither of which was isolated.
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