Polymer-immobilized catalysis has many advantages such as easy recovery and reuse of catalyst. We prepared three novel chiral 1,1＇-bi-2-naphthol-Ti coordination polymers with properly designed ligands and Ti（O^ipr）...Polymer-immobilized catalysis has many advantages such as easy recovery and reuse of catalyst. We prepared three novel chiral 1,1＇-bi-2-naphthol-Ti coordination polymers with properly designed ligands and Ti（O^ipr）4 under mild conditions. The prepared polymers exhibited good activity and excellent enantioselectivity （over 99%ee） in catalyzing the asymmetric oxidation of sulfides. The bridge linker in the polymer and the reaction solvent noticeably affected the enantioseleetivity. The chiral coordination polymer was very stable and easy to separate from catalyzed reaction systems, with no significant loss of activity or enantioselectivity after reuse for at least ten times. These findings suggest a promising type of catalysts for synthesizing the widely used sulfoxides by asymmetrically oxidizing sulfides.展开更多
Dehydroabitetic acid-β-naphthol ester was prepared by O-acylation reaction of dehydroabitetic acid and β-naphthol in the presence of pyridine as catalyst.The main influence factors were studied and the optimum react...Dehydroabitetic acid-β-naphthol ester was prepared by O-acylation reaction of dehydroabitetic acid and β-naphthol in the presence of pyridine as catalyst.The main influence factors were studied and the optimum reaction conditions were found by orthogonal experimental design to be as follows∶ reaction temperature 100℃,reaction time 3.0h,the molar ratio of dehydroabitetic acyl chloride to pyridine 1∶1.4,the molar ratio of dehydroabitetic acyl chloride to β-naphthol 1∶1.2,the yield amounted to 78.5% with the purity of 97.62%.The target product was analyzed and characterized by IR,TLC and GC-MS methods.展开更多
2-chloro-4,6-bis-naphthalen-2-yloxy-1,3,5-triazine(CDNTA) was synthesized by nucleophilic substitution reaction between cyanuric chloride and β-naphthol.The effects of the stuff molar ratio,the variety and dosage of ...2-chloro-4,6-bis-naphthalen-2-yloxy-1,3,5-triazine(CDNTA) was synthesized by nucleophilic substitution reaction between cyanuric chloride and β-naphthol.The effects of the stuff molar ratio,the variety and dosage of base,the solvents,the reaction time and temperature on the yields of CDNTA were investigated.The optimized reaction conditions included that cyanuric chloride and β-naphthol were mixed at the stoichiometric ratio,sodium hydroxide was used as base(its molar ratio to cyanuric chloride was 2.1:1),mixture of acetone and water(the volume ratio was 1:1) was used as solvent,the reaction was carried out in ice water bath for 2 h,then at 40 ℃ for 7 h.Under these conditions,the yield of CDNTA could reach 96.3%.The target compound was characterized by elementary analysis,IR spectrum,1 H-NMR and MS.The solubility,thermo stability,and UV spectrum of CDNTA were investigated.展开更多
基金the Natural Science Foundation of Chongqing Science and Technology Committee (No.2007BB4442)the Science and Technology Research Project of Chongqing Education Commission (No.KJ070402)
文摘Polymer-immobilized catalysis has many advantages such as easy recovery and reuse of catalyst. We prepared three novel chiral 1,1＇-bi-2-naphthol-Ti coordination polymers with properly designed ligands and Ti（O^ipr）4 under mild conditions. The prepared polymers exhibited good activity and excellent enantioselectivity （over 99%ee） in catalyzing the asymmetric oxidation of sulfides. The bridge linker in the polymer and the reaction solvent noticeably affected the enantioseleetivity. The chiral coordination polymer was very stable and easy to separate from catalyzed reaction systems, with no significant loss of activity or enantioselectivity after reuse for at least ten times. These findings suggest a promising type of catalysts for synthesizing the widely used sulfoxides by asymmetrically oxidizing sulfides.
文摘Dehydroabitetic acid-β-naphthol ester was prepared by O-acylation reaction of dehydroabitetic acid and β-naphthol in the presence of pyridine as catalyst.The main influence factors were studied and the optimum reaction conditions were found by orthogonal experimental design to be as follows∶ reaction temperature 100℃,reaction time 3.0h,the molar ratio of dehydroabitetic acyl chloride to pyridine 1∶1.4,the molar ratio of dehydroabitetic acyl chloride to β-naphthol 1∶1.2,the yield amounted to 78.5% with the purity of 97.62%.The target product was analyzed and characterized by IR,TLC and GC-MS methods.
文摘2-chloro-4,6-bis-naphthalen-2-yloxy-1,3,5-triazine(CDNTA) was synthesized by nucleophilic substitution reaction between cyanuric chloride and β-naphthol.The effects of the stuff molar ratio,the variety and dosage of base,the solvents,the reaction time and temperature on the yields of CDNTA were investigated.The optimized reaction conditions included that cyanuric chloride and β-naphthol were mixed at the stoichiometric ratio,sodium hydroxide was used as base(its molar ratio to cyanuric chloride was 2.1:1),mixture of acetone and water(the volume ratio was 1:1) was used as solvent,the reaction was carried out in ice water bath for 2 h,then at 40 ℃ for 7 h.Under these conditions,the yield of CDNTA could reach 96.3%.The target compound was characterized by elementary analysis,IR spectrum,1 H-NMR and MS.The solubility,thermo stability,and UV spectrum of CDNTA were investigated.
