- Synthesis method of trans-4-(trans-4'-alkyl cyclohexyl) cyclohexyl formaldehyde
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The invention discloses a preparation method of trans-4-(trans-4'-alkyl cyclohexyl) cyclohexyl formaldehyde. Trans-4-(trans-4'-alkyl cyclohexyl) cyclohexyl formaldehyde is obtained through catalytic oxidation reaction of trans-4-(trans-4'-alkyl cyclohexyl) cyclohexyl methanol, wherein the oxidizing agent is oxygen or air, and the catalytic system comprises a catalyst A, a catalyst B and a catalyst C. The catalyst A is piperidine nitroxide free radicals and derivatives thereof, the catalyst B is nitric oxide equivalent, and the catalyst C is bromide, acid or ferric iron salt. The catalytic system of the synthesis method is efficient and environmentally friendly, the whole reaction process is clean and safe, and the synthesis method has great advantages from the aspect of economy or environmental protection.
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Paragraph 0023; 0024
(2021/06/21)
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- The Synthesis and Liquid Crystal Behavior of p-Benzotrifluoride Compounds III
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Two compounds with the general structure R-CY-CY-CH2-CH2-Ph-CF3 were synthesized where CY is a 1,4-disubstituted trans cyclohexyl ring, and R is a n-alkyl group.The synthesis procedure is discussed and structural assignments confirmed by proton and carbon 13 NMR spectroscopy.Liquid crystal behavior was evaluated by DTA and polarized microscope.We discovered that the two compounds have smectic and nematic phases and can be used in fast switching liquid crystal mixtures.
- Liang, J. C.,Cross, J. O.,Chen, L.
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p. 199 - 206
(2007/10/02)
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- Aliphatic Liquid Crystals with Positive Dielectric Anisotropy
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Cyanoethyl-substituted cyclohexyl cyclohexanoates, bi(cyclohexanes) and phenyl cyclohexanes were synthesized.Their mesomorphic behaviour is compared to that of the corresponding cyano derivatives. (Cyanoethyl)cyclohexyl cyclohexanoates show mesomorphic properties in contrast to the corresponding cyano derivatives.Separation of the cyano substituent from the rigid core of an anisotropic aliphatic compound by methylene groups enhances the thermodynamic stability of its mesophase.In aromatic compounds, the cyanoethyl group leads to lower clearing points.These phenomena are attributed to the influence of steric effects on the packing density and to the dependence of the clearing point on molecular association.
- Osman, Maged A.,Huynh-Ba, T.
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p. 959 - 963
(2007/10/02)
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