活性炭负载磷钨酸催化合成氯乙酸正戊酯

制备了活性炭为载体负载型磷钨酸催化剂,并采用XRD、IR、N2吸附等手段进行了表征。将其用作合成氯乙酸正戊酯催化剂。考察了醇酸物质的量比、温度、催化剂用量、反应时间等各种因素对酯化率的影响。实验结果表明,活性炭负载磷钨酸催化活性良好。适宜的反应条件：磷钨酸负载量为18%,醇酸物质的量比为1.3∶1,催化剂用量为反应物总质量的2.5%,反应时间（3-5）h。酯化率最高可达98%。

乙酸催化氯化法合成氯乙酸的催化剂研究现状

探讨了乙酸氯化法的反应机理,分析了乙酸催化氯化法合成氯乙酸过程中催化剂的作用,介绍了国内外近年来乙酸氯化法中催化剂体系的研究现状,展望了其研究方向。

芳香醛肟氧基乙酸的合成

目的:合成芳香醛肟的衍生物。方法:用芳香醛肟与氯乙酸反应得目标物。结果:合成5个芳香醛肟氧基乙酸化合物。结论:目标化合物的结构经IR、1HNMR、MS确证。

Synthesis of N-(3-(Dimethylamino)-2-(4- Ethoxyphenyl) Alllidene)-N-Methylmethana- minium Perchlorate by Willgerodt-Kindler Reaction

Liquid crystals containing phenylpyrimidine units are the fascination condensed state of soft matter with unique electrical, optical and mechanical properties. In this paper, a novel and efficient route was reported for the synthesis of N-（3-（dimethylamino）-2-（4-ethoxyphenyl）allylidene）-N-methylmethanaminium perchlorate by the WillgerodtKindler reaction, which can be further applied to prepare liquid crystals containing phenylpyrimidine units. The product was confirmed by JHNMR, MS, FT-IR and elemental analysis. The experimental conditions of the Willgerodt-Kindler reaction were also studied and the results show that the yield of p-ethoxyphenyl-acetic acid increased remarkably with a reaction time up to 60 rain, then decreased due to carbonization. On the other hand, the yield was also influenced by microwave power. It increased from 20.6 % to 78.8 % with a rise in the microwave power from 250 W to 450 W, but the product was carbonized at 640 W.