On the molecular structure, packing coefficients and thermal stabilities of the homologous series p-methoxy-XY-p’-alkyl tolanes was written by Prasad, J. Shashidhara. And the article was included in Molecular Crystals and Liquid Crystals in 1978.Category: ethers-buliding-blocks This article mentions the following:
The thermal stability in the p-methoxy-p‘-alkyltolan homologous series was studied by mol. packing coefficients (ratio of geometric volume of a mol. to the volume per mol. in the crystal) without actual conformation of the mols. in the crystalline state. The packing coefficient decreases for the nonmesogenic members (Me and Et) accounting for the decrease in stability and suddenly increases when the mesogenic state is encountered and then again decreases accounting for the thermal stability decrease within the mesogenic materials. In the experiment, the researchers used many compounds, for example, 1-Methoxy-4-((4-propylphenyl)ethynyl)benzene (cas: 39969-26-1Category: ethers-buliding-blocks).
1-Methoxy-4-((4-propylphenyl)ethynyl)benzene (cas: 39969-26-1) belongs to ethers. Ether is less polar than esters, alcohols or amines because of the oxygen atom that is unable to participate in hydrogen bonding due to the presence of bulky alkyl groups on both sides of the oxygen atom. But ether is more polar than alkenes. Ethers feature bent C閳ユ彊閳ユ弲 linkages. In dimethyl ether, the bond angle is 111鎺?and C閳ユ彊 distances are 141 pm. The barrier to rotation about the C閳ユ彊 bonds is low. The bonding of oxygen in ethers, alcohols, and water is similar. In the language of valence bond theory, the hybridization at oxygen is sp3.Category: ethers-buliding-blocks
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem