Effects of cyclohexyl group on electro-optical properties of liquid crystal tolan was written by Chen, Xin-bing;Feng, Kai;Jia, Lin;An, Zhong-wei. And the article was included in Yejing Yu Xianshi in 2004.Electric Literature of C18H18O This article mentions the following:
As one of widely used liquid crystals, tolans are mainly used for improving birefringence of liquid crystal composition Effects of cyclohexyl group introduced into mol. on the electro-optical properties of tolan were investigated. The results show that the threshold voltage and birefringence of the composition can be increased by introducing cyclohexyl group into mol. In the experiment, the researchers used many compounds, for example, 1-Methoxy-4-((4-propylphenyl)ethynyl)benzene (cas: 39969-26-1Electric Literature of C18H18O).
1-Methoxy-4-((4-propylphenyl)ethynyl)benzene (cas: 39969-26-1) belongs to ethers. Ethers are good solvents partly because they are not very reactive. Most ethers can be cleaved, however, by hydrobromic acid (HBr) to give alkyl bromides or by hydroiodic acid (HI) to give alkyl iodides. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly autoxidize to form hydroperoxides and dialkyl peroxides. If concentrated or heated, these peroxides may explode. To prevent such explosions, ethers should be obtained in small quantities, kept in tightly sealed containers, and used promptly.Electric Literature of C18H18O
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem