Synthesis and Liquid Crystal Properties of some Acetylene Derivatives

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Abstract
A series of p-alkoxyphenyl acetylenedicarboxylates has been prepared which allows a direct comparison to be made between the triple bond and the para-phenylene ring as central groups. The acetylene derivatives are found to have phase transitions some 60–100° below those of the corresponding para-phenylene compounds; however, they also exhibit much lower nematic stability. Since both central groups are rigid and linear with respect to substituents, effects due to the electronic and geometric structure of the triple bond are discussed as contributing factors to mesophase instability. Several acetylene derivatives containing one or more methylene groups near the center of the molecule were also prepared but none exhibited mesomorphic behavior.

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