Liquid Crystalline Phenyl‐trans‐4‐n‐alkylcyclohexanecarboxylates
The syntheses of p‐substituted phenyl‐trans‐4‐n‐alkylcyclohexanecarboxylates 1–12 and cyclohexyl‐p‐n‐alkylbenzoates 15–17 and their mesomorphic properties are described. p‐n‐Alkoxyphenyl‐trans‐4‐n‐alkylcyclohexanecarboxylates 1–8 exhibit larger thermal stability of mesophases than analogous phenylbenzoates 13. Trans‐4‐subst. cyclohexyl‐p‐n‐alkylbenzoates 15–17 and S‐phenyl‐thiocylohexanecarboxylates 19 on the other side are less stable.
2‐Halogeno substituted N‐cyanomethyl‐N‐methylbenzamides 1a‐1i were investigated in a correlation analysis by ir spectroscopy to determine the conformational behavior. Compound 1h gives 4‐methyl‐2‐methylthio‐8‐nitro‐5‐oxo‐4,5‐dihydro‐1,4‐benzothiazepine‐3‐carbonitrile 3 by dithiocarboxylation procedure whereas 1b was not able to react to heterocyclic seven‐membered ring system.
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