Photooxidation of citronitrile followed by esterification gives two new perfume prod-ucts: acetic esters of 2-methyl-6-formyl-1, 5-dieneheptanol-3 and 7-cyano-2, 6-dimethyl-3,6-dieneheptanol-2. The content of the seco...Photooxidation of citronitrile followed by esterification gives two new perfume prod-ucts: acetic esters of 2-methyl-6-formyl-1, 5-dieneheptanol-3 and 7-cyano-2, 6-dimethyl-3,6-dieneheptanol-2. The content of the secondary alcohol isomer in -ene type reaction ofcitronitrile has been found to be extremely low. Formation of 2-formyltetrahydrofuran, theprecursor of 2-methyl-6-formyl-1,5-diene-3-heptyl acetate, might proceed via ketoneoxidation mechanism of the secondary alcohol. In order to confirm the proposed mechanism,the disappearance rate constants of citronitrile, linalool acetate have been determined by com-parison with the photooxidation rate constant of 2,3-diphenyl-p-hexadioxene-2. A tetrapterouscorrelation diagram of C-2 double bond photooxidation of cis- and trans-citronitriles has beenused to interpret our observations. The difference in the rate constants of cis- and trans-citronitriles provides new evidence supporting the stepwise mechanism of -ene type reactionof singlet oxygen.展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘Photooxidation of citronitrile followed by esterification gives two new perfume prod-ucts: acetic esters of 2-methyl-6-formyl-1, 5-dieneheptanol-3 and 7-cyano-2, 6-dimethyl-3,6-dieneheptanol-2. The content of the secondary alcohol isomer in -ene type reaction ofcitronitrile has been found to be extremely low. Formation of 2-formyltetrahydrofuran, theprecursor of 2-methyl-6-formyl-1,5-diene-3-heptyl acetate, might proceed via ketoneoxidation mechanism of the secondary alcohol. In order to confirm the proposed mechanism,the disappearance rate constants of citronitrile, linalool acetate have been determined by com-parison with the photooxidation rate constant of 2,3-diphenyl-p-hexadioxene-2. A tetrapterouscorrelation diagram of C-2 double bond photooxidation of cis- and trans-citronitriles has beenused to interpret our observations. The difference in the rate constants of cis- and trans-citronitriles provides new evidence supporting the stepwise mechanism of -ene type reactionof singlet oxygen.
