| abstract |
1423330 Cyclohexene diones FIRMENICH SA 9 Dec 1974 [7 Dec 1973] 53157/74 Heading C2C [Also in Division B1] Compounds of the formula where one of R<SP>1</SP>, R<SP>2</SP> and R<SP>3</SP> is alkyl, another is H and the third is H or alkyl, and R<SP>4</SP> and R<SP>5</SP> are alkyl are prepared by oxidizing a compound of the formula in the gaseous phase by means of oxygen using as catalyst an oxygen-containing compound of vanadium. 5,5-Dimethyl-3-formyl-cyclohex- 2-en-1-one is also obtained when 3,3,5-trimethyl-cyclohex-5-en-1-one is oxidized. |