The photoisomerization of spiro[2.4] Hepta-4,6-diene

✍ Scribed by Paul H. Mazzoochi

• Publisher: Elsevier Science
• Year: 1969
• Tongue: French
• Weight: 211 KB
• Volume: 10
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(01)97717-2

✦ Synopsis

Although 1,2 hydrogen mlgratlon in ground state radicals are Infrequent, there are several photochemical examples2s3 In which the excited states are presumed to have "diradlcal" character. One of the flrst examples, reported by Schuster and Polowczyk,' was the photolsomerlzatlon of splrodlenone & to 2 and Is of particular Interest since Plrkle and Koser4 have ehown that the reaction is quite general for substituted splrodlenones lb-e. Somewhat aurprisingly &J also affords a quinone methlde 2, a reaction whloh must take