The title compound, a fine artificial sweetener of high sweetness and low caloricity, has been synthesized using β-pinene from turpentine oil as raw material by 4-step reactions: epoxidation, isomerization, oxidation...The title compound, a fine artificial sweetener of high sweetness and low caloricity, has been synthesized using β-pinene from turpentine oil as raw material by 4-step reactions: epoxidation, isomerization, oxidation and oximation. The product was obtained with 99% purity in total yield of 22.5%.展开更多
The method for synthesis of the title compound has been improved, with product yield being increased to 58%. The following measures have been adopted: using 1,8-diazabicyclo\undec-7-ene(DBU) as catalyst instead of pip...The method for synthesis of the title compound has been improved, with product yield being increased to 58%. The following measures have been adopted: using 1,8-diazabicyclo\undec-7-ene(DBU) as catalyst instead of piperidine; adding benzene in the reaction mixture to favor azeotropic dehydration. The optimum molar ratio of DBU/ethylacetoacetate/solid paraformaldehyde was 4∶20∶11.展开更多
本文在假定A∞WOS≈[GE/(RT))]EOS' p->0=[GE(x)/(RT)]solution model 的基础上经过一系列的推导,将原WS 混合规则中的交叉相互怍用参数kij简化为一个只与组份和活度系数模型参数有关的函数,并将该简化后的WS混合规则(WS_S)结合P...本文在假定A∞WOS≈[GE/(RT))]EOS' p->0=[GE(x)/(RT)]solution model 的基础上经过一系列的推导,将原WS 混合规则中的交叉相互怍用参数kij简化为一个只与组份和活度系数模型参数有关的函数,并将该简化后的WS混合规则(WS_S)结合PR状态方程及NRTL活度模型对16对双元混合物的汽液相平衡进行了关联。关联结果表明,在较宽的温度与压力范围内,应用该模型可得到令人满意的结果。与原WS混合规则相比,精度基本相当,但是计算量却得到了一定的减小,并使方程具有一定的预测性,可以更加方便地应用于工程设计计算中。展开更多
Three diorganotin compounds containing silicon and their phenanthroline complexes have been synthesized.Their structures were characterized by elemental analsis,IR and NMR(1H,13C).The results indicated that in the com...Three diorganotin compounds containing silicon and their phenanthroline complexes have been synthesized.Their structures were characterized by elemental analsis,IR and NMR(1H,13C).The results indicated that in the complexes the two donor N atoms of the ligand coordinate to Sn atom,gave the struture of six-coordinated distorted octahedron.展开更多
文摘The title compound, a fine artificial sweetener of high sweetness and low caloricity, has been synthesized using β-pinene from turpentine oil as raw material by 4-step reactions: epoxidation, isomerization, oxidation and oximation. The product was obtained with 99% purity in total yield of 22.5%.
文摘The method for synthesis of the title compound has been improved, with product yield being increased to 58%. The following measures have been adopted: using 1,8-diazabicyclo\undec-7-ene(DBU) as catalyst instead of piperidine; adding benzene in the reaction mixture to favor azeotropic dehydration. The optimum molar ratio of DBU/ethylacetoacetate/solid paraformaldehyde was 4∶20∶11.
文摘本文在假定A∞WOS≈[GE/(RT))]EOS' p->0=[GE(x)/(RT)]solution model 的基础上经过一系列的推导,将原WS 混合规则中的交叉相互怍用参数kij简化为一个只与组份和活度系数模型参数有关的函数,并将该简化后的WS混合规则(WS_S)结合PR状态方程及NRTL活度模型对16对双元混合物的汽液相平衡进行了关联。关联结果表明,在较宽的温度与压力范围内,应用该模型可得到令人满意的结果。与原WS混合规则相比,精度基本相当,但是计算量却得到了一定的减小,并使方程具有一定的预测性,可以更加方便地应用于工程设计计算中。
文摘Three diorganotin compounds containing silicon and their phenanthroline complexes have been synthesized.Their structures were characterized by elemental analsis,IR and NMR(1H,13C).The results indicated that in the complexes the two donor N atoms of the ligand coordinate to Sn atom,gave the struture of six-coordinated distorted octahedron.
