A convenient approach on transesterification to preparing the complexee of β-alkoycarbonylethyltin trichlorides with dibenzylsulfoxide (DBSO) andhexametkylphosphoramide (HMPA) was reported. The structures of complex...A convenient approach on transesterification to preparing the complexee of β-alkoycarbonylethyltin trichlorides with dibenzylsulfoxide (DBSO) andhexametkylphosphoramide (HMPA) was reported. The structures of complexes were characterized by elemental analysis, IR, 1HNMR and X-ray single crystal diffraction.The possible mechanism for the transesterification of complexes of β-onylethyltin trichloride with an alcohol was suggested展开更多
3-Aryl-l,2,4-benzotriazines were conveniently prepared in moderate to good yields from 1,1-bis（benzotriazol-1- yl）methylarenes with allylsamarium bromide/hexamethylphosphramide （allylSmBr/HMPA）. Preliminary result...3-Aryl-l,2,4-benzotriazines were conveniently prepared in moderate to good yields from 1,1-bis（benzotriazol-1- yl）methylarenes with allylsamarium bromide/hexamethylphosphramide （allylSmBr/HMPA）. Preliminary results in- dicate that HMPA may enhance the reducing ability as well as prohibit the nucleophicility of allylSmBr, thus mak- ing allylSmBr/HMPA as a promising single-electron transfer （SET） reagent.展开更多
The dl-form of the sex pheromone of Japanese b(?)tle and the trail pheromone of Bontebok were synthesised in high purity of (Z)-olefinic configuration. The key step of the syntheses of compounds (1) and (2) involved s...The dl-form of the sex pheromone of Japanese b(?)tle and the trail pheromone of Bontebok were synthesised in high purity of (Z)-olefinic configuration. The key step of the syntheses of compounds (1) and (2) involved stereospecific addition of n-alkyl cuprates to acetylene followed by addition of vinyl cuprates to aldehyde (7) and 3-buten--2-one.展开更多
A conjugated dienic benzyl ether was shown to undergo Wittig sigmatropic rearrangement to give a mixture of[1,2]and[1,4]besides the expected[2,3]rearrangement product.The solvent effect as well as the reaction pathway...A conjugated dienic benzyl ether was shown to undergo Wittig sigmatropic rearrangement to give a mixture of[1,2]and[1,4]besides the expected[2,3]rearrangement product.The solvent effect as well as the reaction pathways were discussed.展开更多
文摘A convenient approach on transesterification to preparing the complexee of β-alkoycarbonylethyltin trichlorides with dibenzylsulfoxide (DBSO) andhexametkylphosphoramide (HMPA) was reported. The structures of complexes were characterized by elemental analysis, IR, 1HNMR and X-ray single crystal diffraction.The possible mechanism for the transesterification of complexes of β-onylethyltin trichloride with an alcohol was suggested
基金Acknowledgement This work was financially supported by National Natural Science Foundation of China （No. 20802070） and the research foundation from Key Laboratory of Synthetic Organic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry （CAS）. We thank Professor Ran Hong at SIOC for helpful discus- sions.
文摘3-Aryl-l,2,4-benzotriazines were conveniently prepared in moderate to good yields from 1,1-bis（benzotriazol-1- yl）methylarenes with allylsamarium bromide/hexamethylphosphramide （allylSmBr/HMPA）. Preliminary results in- dicate that HMPA may enhance the reducing ability as well as prohibit the nucleophicility of allylSmBr, thus mak- ing allylSmBr/HMPA as a promising single-electron transfer （SET） reagent.
文摘The dl-form of the sex pheromone of Japanese b(?)tle and the trail pheromone of Bontebok were synthesised in high purity of (Z)-olefinic configuration. The key step of the syntheses of compounds (1) and (2) involved stereospecific addition of n-alkyl cuprates to acetylene followed by addition of vinyl cuprates to aldehyde (7) and 3-buten--2-one.
基金The research work was supported by the National Natural Science Foundation of China.
文摘A conjugated dienic benzyl ether was shown to undergo Wittig sigmatropic rearrangement to give a mixture of[1,2]and[1,4]besides the expected[2,3]rearrangement product.The solvent effect as well as the reaction pathways were discussed.
