INDOLENINE OXIDES .7. PHOTODECARBONYLATION OF 2 3,3-DIMETHYL-2-INDOLINONES

Indolenine Oxides, VII. Photodecarbonylation of Two 3,3‐Dimethyl‐2‐indolinones The 2‐indolinones 2 a, b b in methanol undergo decarbonylation by UV light (254 nm) resulting in formation of the o‐quinonemethide imines 3 a b. Main products always are the methanol adducts 4a, c. Among the minor products, the quinoline 12 and the diamine 7 are remarkable, the latter because it necessarily originates from the (on the basis of literature data) unexpected 3a‐dimer 9. Copyright © 1979 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim