Isoamyl acetate was catalytically synthesized by SnCl 4·5H 2O. The effects of reaction time, catalyst amount,and ratio of glacial acetic acid to isoamyl alcohol were investgated. The results showed that at condit...Isoamyl acetate was catalytically synthesized by SnCl 4·5H 2O. The effects of reaction time, catalyst amount,and ratio of glacial acetic acid to isoamyl alcohol were investgated. The results showed that at condition of molar ratio of HAc to isoamyl alcohol=1∶1 08, that of SnCl 4·5H 2O to HAc=1∶100, 150 ℃, 1 h isoamyl acetate can be obtained in yield of 95 6%.展开更多
Bi-2-naphthol(BINOL) enantiomers were baseline resolved on HPLC network-polymeric chiral stationary phase (Kromasil CHI-DMB, based on O,O′-di(3,5-dimethylbenzoyl)N,N′-diallyl-L-tartaric diamide). The effects of the ...Bi-2-naphthol(BINOL) enantiomers were baseline resolved on HPLC network-polymeric chiral stationary phase (Kromasil CHI-DMB, based on O,O′-di(3,5-dimethylbenzoyl)N,N′-diallyl-L-tartaric diamide). The effects of the column temperature, the type and the concentration of the polar alcohol modifier in the binary mobile phase on the chiral resolution were examined. The separation value was 1.191 when V(hexane)∶V(2-propanol)=95∶5 was used as mobile phase at a flow rate of 1.0 mL/min at 25 ℃ with retention time being within 14 minutes. The mechanism of the chiral recognition was discussed with the calculated thermodynamic parameters. It is suggested that hydrogen bonding interaction between hydroxyl group of the solute and the CSP play important roles in chiral recognition. The chiral resolution is enthalpy-entropy driven and the enthalpy contribution is greater. 1,1′-Bi-2-naphthyl di-p-toluenesulfonate, 1,1′-bi-2-naphthyl diacetate and 1,1′-bi-2-naphthyl dicinnamate could not be resolved at experiment conditions used.展开更多
Naphthyl acetate was synthesized in yield of 96.8% using sodium bisulfate as catalyst. The optimum conditions were as follows: β naphthol 3 6 g, acetic anhydride 3 mL, sodium bisulfate 0 5 g , temperature 80 ℃, reac...Naphthyl acetate was synthesized in yield of 96.8% using sodium bisulfate as catalyst. The optimum conditions were as follows: β naphthol 3 6 g, acetic anhydride 3 mL, sodium bisulfate 0 5 g , temperature 80 ℃, reaction time 40 min . The method has advantages of cheapness and simplicity , and the catalyst can be easily regenerated.展开更多
文摘Isoamyl acetate was catalytically synthesized by SnCl 4·5H 2O. The effects of reaction time, catalyst amount,and ratio of glacial acetic acid to isoamyl alcohol were investgated. The results showed that at condition of molar ratio of HAc to isoamyl alcohol=1∶1 08, that of SnCl 4·5H 2O to HAc=1∶100, 150 ℃, 1 h isoamyl acetate can be obtained in yield of 95 6%.
文摘Bi-2-naphthol(BINOL) enantiomers were baseline resolved on HPLC network-polymeric chiral stationary phase (Kromasil CHI-DMB, based on O,O′-di(3,5-dimethylbenzoyl)N,N′-diallyl-L-tartaric diamide). The effects of the column temperature, the type and the concentration of the polar alcohol modifier in the binary mobile phase on the chiral resolution were examined. The separation value was 1.191 when V(hexane)∶V(2-propanol)=95∶5 was used as mobile phase at a flow rate of 1.0 mL/min at 25 ℃ with retention time being within 14 minutes. The mechanism of the chiral recognition was discussed with the calculated thermodynamic parameters. It is suggested that hydrogen bonding interaction between hydroxyl group of the solute and the CSP play important roles in chiral recognition. The chiral resolution is enthalpy-entropy driven and the enthalpy contribution is greater. 1,1′-Bi-2-naphthyl di-p-toluenesulfonate, 1,1′-bi-2-naphthyl diacetate and 1,1′-bi-2-naphthyl dicinnamate could not be resolved at experiment conditions used.
文摘Naphthyl acetate was synthesized in yield of 96.8% using sodium bisulfate as catalyst. The optimum conditions were as follows: β naphthol 3 6 g, acetic anhydride 3 mL, sodium bisulfate 0 5 g , temperature 80 ℃, reaction time 40 min . The method has advantages of cheapness and simplicity , and the catalyst can be easily regenerated.
