A new synthetic route leading to α-(2-(6-methoxynaphthy1))-propionic acid has ben developed. Successive one-step preparation of the appropriate α-aryl propionitrile from the aryl halides with propionitrile by photo-...A new synthetic route leading to α-(2-(6-methoxynaphthy1))-propionic acid has ben developed. Successive one-step preparation of the appropriate α-aryl propionitrile from the aryl halides with propionitrile by photo-SRN1 procedure followed by hydrolysis gives the desired α-aryl propionic acid in excellent total yield. The photostimulated reaction of 2-bromonaph-thalene with acetonitrile or propionitrile in KNH2-NH3 solution to form the corresponding nucleophilic substitution product occurs with quantum yields considerably in excess of unit, while the pseudo-first-order rate constants of the photo-SRN1 are 30.9 and 47.0×10-5mol·s-1, respectively. Definite evidence to support the excitation of ground CTC and electron transfer from anion to ArX within the complex comes from the observation of the same φ】200 and φ】313 as well as MO calculation.展开更多
Ancylis (Anchylopera) sativa (Liu) (Lepidoptera, Tortricidae, Tortricinae), one of the most destructive pests of the Chinese date orchard, is widley distributed in Hebei, Shanxi, Zhejiang, Shaanxi and Anhui provinces ...Ancylis (Anchylopera) sativa (Liu) (Lepidoptera, Tortricidae, Tortricinae), one of the most destructive pests of the Chinese date orchard, is widley distributed in Hebei, Shanxi, Zhejiang, Shaanxi and Anhui provinces in China. Previous work has shown that the virgin female or female that extracts baited trap can attract males, hence the identification of the sex pheromone would facilitate the use of trap for monitoring purpose and would be the first step in the exploration of a possible pest control method.展开更多
In a continuous effort to pursue the generality on the relationship between photoreaction mechanism and molecular orbital overlap of ground chromophores, a molecule of particular interest is 3-methyl-3-biphenylyl-1-bu...In a continuous effort to pursue the generality on the relationship between photoreaction mechanism and molecular orbital overlap of ground chromophores, a molecule of particular interest is 3-methyl-3-biphenylyl-1-butene, 1, due to the presence of excitation energy gap of 74 kcal/mol, which might make the MO overlap channel of chromophores more efficient.展开更多
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A new synthetic route leading to α-(2-(6-methoxynaphthy1))-propionic acid has ben developed. Successive one-step preparation of the appropriate α-aryl propionitrile from the aryl halides with propionitrile by photo-SRN1 procedure followed by hydrolysis gives the desired α-aryl propionic acid in excellent total yield. The photostimulated reaction of 2-bromonaph-thalene with acetonitrile or propionitrile in KNH2-NH3 solution to form the corresponding nucleophilic substitution product occurs with quantum yields considerably in excess of unit, while the pseudo-first-order rate constants of the photo-SRN1 are 30.9 and 47.0×10-5mol·s-1, respectively. Definite evidence to support the excitation of ground CTC and electron transfer from anion to ArX within the complex comes from the observation of the same φ】200 and φ】313 as well as MO calculation.
文摘Ancylis (Anchylopera) sativa (Liu) (Lepidoptera, Tortricidae, Tortricinae), one of the most destructive pests of the Chinese date orchard, is widley distributed in Hebei, Shanxi, Zhejiang, Shaanxi and Anhui provinces in China. Previous work has shown that the virgin female or female that extracts baited trap can attract males, hence the identification of the sex pheromone would facilitate the use of trap for monitoring purpose and would be the first step in the exploration of a possible pest control method.
文摘In a continuous effort to pursue the generality on the relationship between photoreaction mechanism and molecular orbital overlap of ground chromophores, a molecule of particular interest is 3-methyl-3-biphenylyl-1-butene, 1, due to the presence of excitation energy gap of 74 kcal/mol, which might make the MO overlap channel of chromophores more efficient.
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.
