摘要
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.
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 syn- thesis of N-(3-(dimethylamino)-2-(4-ethoxyphenyl)allylidene)-N-methylmethanaminium perchlorate by the Willgerodt- Kindler reaction, which can be further applied to prepare liquid crystals containing phenylpyrimidine units. The product was confirmed by 1HNMR, 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 min, 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.
