synthesis, characterization and study the liquid crystalline properties of some new bent compounds derived from diethylpyrimidine-2,4,6(1h,3h,5h)-trione

This article includes designed and synthesized for bent-shaped liquid crystal molecules starting from 5,5-diethylpyrimidine-2,4,6(1h,3h,5h)-trione and two moles of chloroacetylchloride in n, n-dimethyl formamide (dmf) and triethylamine (tea) to product compound [i] ,then reacted the later compound with two moles of 4-hydroxybenzonitrile to yield nitrile compound [ii]. likewise, reaction 5,5-diethylpyrimidine-2,4,6(1h,3h,5h)-trione and two moles of ethylchloroacetate with fused sodium acetate in ethanol to create an ester compound [iii], and then the later compound was reacted with two moles of hydrazine hydrate in ethanol to obtained hydrazide acid compound [iv]. after that, the compound [iv] reacted with two moles of ethyl acetoacetate in ethanol to synthesis compound [v]. the chemical structure of synthesis compounds was studied using ft-ir, 1h-nmr, 13c-nmr, and mass spectroscopy. polarized optical microscope (pom) and differential scanning calorimetry (dsc) were used to examine the mesomorphic behaviour. the compound [ii] with cyano terminal group showed nematic phase only on heating at 159 °c.