在101.32 k Pa下,用改进的Othmer釜测定了含离子液体1-乙基-3-甲基咪唑三氟甲磺酸盐([emim]OTf)的乙酸乙酯-乙腈物系的等压汽液平衡数据;采用NRTL方程对实验数据进行关联,关联效果良好。实验结果表明,加入[emim]OTf后,乙酸乙酯-乙腈二...在101.32 k Pa下,用改进的Othmer釜测定了含离子液体1-乙基-3-甲基咪唑三氟甲磺酸盐([emim]OTf)的乙酸乙酯-乙腈物系的等压汽液平衡数据;采用NRTL方程对实验数据进行关联,关联效果良好。实验结果表明,加入[emim]OTf后,乙酸乙酯-乙腈二组分物系汽液平衡线发生偏离,[emim]OTf含量越高,偏离程度越大;[emim]OTf具有明显的盐析效应,当[emim]·OTf的含量达到5%(x)时,就可消除乙酸乙酯-乙腈物系的共沸点;[emim]OTf可作为乙酸乙酯-乙腈萃取精馏的萃取剂。展开更多
The new room-temperature molten salt was prepared based on LiTFSI[LiNC(SO 2CF 3) 2] with OZO(C 3H 5NO 2) which were not reported in literature. Its thermal and electrochemical properties were studied by differential s...The new room-temperature molten salt was prepared based on LiTFSI[LiNC(SO 2CF 3) 2] with OZO(C 3H 5NO 2) which were not reported in literature. Its thermal and electrochemical properties were studied by differential scanning calorimetry, ac impedance spectroscopy and cyclic voltammertry respectively. The results indicated that the structure symmetry of the molecule was depressed and the extent of charges delocalization was expanded, because of introducing oxygen atom of differential electronegativity in OZO molecule. DSC analysis showed that the LiTFSI-OZO molten salt has the excellent thermal stability and its eutectic temperature is below about 223.15 K. Meanwhile, the conductivity of LiTFSI-OZO molten salt at a molar ratio of 1∶4.5 is 0.75×10 -3 S/cm at 298.15 K and 3.50×10 -3 S/cm at 333.15 K. CV analysis showed that the electrochemical window of the sample is about 4 V.展开更多
The fused triazole derivatives,which is an important inhibitors of the dipeptidyl peptidase-Ⅳ enzyme(DPP-Ⅳ),can be used for the treatment or prevention of type 2 diabetes.A new fused triazole derivatives of 3-oxo-3-...The fused triazole derivatives,which is an important inhibitors of the dipeptidyl peptidase-Ⅳ enzyme(DPP-Ⅳ),can be used for the treatment or prevention of type 2 diabetes.A new fused triazole derivatives of 3-oxo-3-[3-trifluoromethyl-5,6-dihydro[1,2,4]-triazolo[4,3-a]pyrazin-7(8H)-yl]-1-phenylpropan-1-amine was synthesized from 2-chloropyrazine and benzaldehyde by hydrazinolysis,trifluoroacetylation,cyclization,hydrogenation,condensation and deprotection reaction.The structures of the compound and its intermediates were determined by IR,NMR,and MS.展开更多
文摘在101.32 k Pa下,用改进的Othmer釜测定了含离子液体1-乙基-3-甲基咪唑三氟甲磺酸盐([emim]OTf)的乙酸乙酯-乙腈物系的等压汽液平衡数据;采用NRTL方程对实验数据进行关联,关联效果良好。实验结果表明,加入[emim]OTf后,乙酸乙酯-乙腈二组分物系汽液平衡线发生偏离,[emim]OTf含量越高,偏离程度越大;[emim]OTf具有明显的盐析效应,当[emim]·OTf的含量达到5%(x)时,就可消除乙酸乙酯-乙腈物系的共沸点;[emim]OTf可作为乙酸乙酯-乙腈萃取精馏的萃取剂。
文摘The new room-temperature molten salt was prepared based on LiTFSI[LiNC(SO 2CF 3) 2] with OZO(C 3H 5NO 2) which were not reported in literature. Its thermal and electrochemical properties were studied by differential scanning calorimetry, ac impedance spectroscopy and cyclic voltammertry respectively. The results indicated that the structure symmetry of the molecule was depressed and the extent of charges delocalization was expanded, because of introducing oxygen atom of differential electronegativity in OZO molecule. DSC analysis showed that the LiTFSI-OZO molten salt has the excellent thermal stability and its eutectic temperature is below about 223.15 K. Meanwhile, the conductivity of LiTFSI-OZO molten salt at a molar ratio of 1∶4.5 is 0.75×10 -3 S/cm at 298.15 K and 3.50×10 -3 S/cm at 333.15 K. CV analysis showed that the electrochemical window of the sample is about 4 V.
文摘The fused triazole derivatives,which is an important inhibitors of the dipeptidyl peptidase-Ⅳ enzyme(DPP-Ⅳ),can be used for the treatment or prevention of type 2 diabetes.A new fused triazole derivatives of 3-oxo-3-[3-trifluoromethyl-5,6-dihydro[1,2,4]-triazolo[4,3-a]pyrazin-7(8H)-yl]-1-phenylpropan-1-amine was synthesized from 2-chloropyrazine and benzaldehyde by hydrazinolysis,trifluoroacetylation,cyclization,hydrogenation,condensation and deprotection reaction.The structures of the compound and its intermediates were determined by IR,NMR,and MS.
