| abstract |
Title cpds. of formula: (where R1 and R2 are H, 1-4C alkyl or opt. alkyl-substd. phenyl; R3, R5, R6 and R7 are H or 1-4C alkyl; R4 is H or an opt. substd. opt. branched 1-12C aliphatic or cycloaliphatic gp.; R8 is 1-4C alkyl; and R9 is an opt. branched, satd. or unsatd. 1-12C aliphatic or cycloaliphatic gp. or an opt. alkyl-substd. phenyl) are prepd. by reacting: at elevated temp., opt. in the presence of an acid, organic peroxy cpd., H2O2 or O2. The products are inters. for natural prodts., e.g. beta-ionone used in synthesis of vitamins A and E, farnesol and phytol; some of them have a distinct scent and can be used in perfumery. |