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• W2023347197 startingPage "675" @default.
• W2023347197 abstract "Abstract The 5-n-alkyl-2-[4-(n-alkoxy)phenyl]pyrimidmes are essential components of most commercial chiral smectic C mixtures for electrooptic display devices based on ferroelectric effects. This is due to their generally relatively low melting points, enantiotropic, relatively wide range smectic C mesophases, low viscosity and ease of preparation. An unsaturated carbon–carbon double bond has now been introduced into the terminal alkoxy chain of the 5-n-alkyl-2-[4-(alkoxy)phenyl]pyrimidines to produce the corresponding alkenyloxy substituted derivatives. The position and nature (E/Z) of the double bond has been varied systematically and the effect on the liquid crystal transition temperatures studied. A number of homologous series of the most interesting alkenyloxy substituted materials has been prepared and evaluated. The position and nature (E/Z) of the double bond changes the conformation of the alkenyloxy chain substantially. This can result in significantly higher smectic C transition temperatures for compounds with a trans double bond (E) at an even number of carbon atoms from the molecular core. Significantly lower transition temperatures (including the melting point) are observed for materials with a cis double bond (Z) at an odd number of carbon atoms from the molecular core. Comparisons with the corresponding alkoxy substituted materials (i.e. without a double bond) are made." @default.
• W2023347197 created "2016-06-24" @default.
• W2023347197 creator A5044960009 @default.
• W2023347197 date "1993-01-01" @default.
• W2023347197 modified "2023-10-16" @default.
• W2023347197 title "2-[4-Alkenyloxy)phenyl]-5-alkylpyrimidines The relationship between position and nature (<i>E/Z</i>) of the double bond and transition temperatures" @default.
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• W2023347197 doi "https://doi.org/10.1080/02678299308027747" @default.
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