S,e-Unsaturated ketones

Cossy and coworkers have reported the stereoselective synthesis of several bicyclic pentanols in good yields, by the intramolecular addition of the ketyl radicals of S,e-unsaturated ketones, generated via photoinduced electron transfer, using triethyl-amine (TEA) or hexamethylphosphonic triamide (HMPA), as donors in acetonitrile... 

An interesting example of a photoreductive reaction of a S,e-unsaturated ketone in the presence of hexamethylphosphoric triamide (HMPA, neat) or triethylamine in acetonitrile has been... 

---