Organische photochemie XXI. 9 H ‐cyclopenta[ b ] [1]benzoselenin ‐ein neues heterocydisches ringsystem
1979; Wiley; Volume: 16; Issue: 1 Linguagem: Inglês
10.1002/jhet.5570160110
ISSN1943-5193
Autores Tópico(s)Radical Photochemical Reactions
ResumoAbstract By way of a photo‐induced selenolester‐seleninone rearrangement, the derivative 5 of a new heterocyclic ring system, 9 H ‐cyclopenta[ b ][1]benzoselenin, has been formed. This rearrangement occurs via a new photosubstitution reaction of S ‐aryl‐ in competition with Se ‐aryl‐groups, followed by photocyclization using 2‐p ‐tolythiocyclopentene ‐1 ‐ selenocarbonic acid Se‐p‐ tolylester (1a) as starting materials. As a competing product in this photo‐rearrangement, a second heterocycle, 7‐methylcyclopenta[ b ] [1]benzothiopyrone (4) (9) has been formed via an intramolecular photochemical Friedel Crafts reaction.
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