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Upstream product

• 123-08-0 4-hydroxy-benzaldehyde 
• 830-09-1 3-(4'-methoxyphenyl)propenoic acid 
• 3943-97-3 methyl p-hydroxycinnamate 
• 42996-84-9 p-methoxycinnamoyl chloride 
• 7400-08-0 para-coumaric acid 

Relevant academic research and scientific papers

Study of mesomorphism and its relation to molecular structure with special reference to central bridges viz. -COO- and -CH=CH-COO- of the homologous series

Two ester homologous series of mesogens, viz., Methyl-p-(p′-n-alkoxy benzoyloxy) cinnamates (X) and Methyl-p-(p′-n-alkoxy cinnamoyloxy) cinnamates (Y) being structurally similar are discussed. Both (X) and (Y) differ in respect of central bridges linking two phenyl rings. Only enantiotropic nematogenic character is observed without exhibition of any smectic character by all members of series (X) and (Y). Thermal stability of series (X) is relatively low as compared to (Y), but nematogenic mesophase lengths are of reverse order. Solid-nematic/solid-isotropic and nematic-isotropic transition curves in the phase diagrams behave in normal manner.

Study of new mesogenic homologous series: Methyl-p-(p′-n- alkoxycinnamoyloxy)cinnamate

Titled homologous series, methyl-p-(p′-n- alkoxycinnamoyloxy)cinnamates is synthesized and studied with a view to understand the relation between molecular structure and mesogenic property. First and second member of the series are nonmesomorphic. Third, fourth, fifth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth members of the series are enantiotropic nematic without exhibition of any smectic property even in the monotropic condition. Odd-even effect is not appeared in nematic-isotropic transition curve. Solid-isotropic or solid-nematic transition curve falls from first to fourth member of the series and follows zig-zag path of rising and falling up to fourteenth homologue and further falls to the sixteenth member of the series. Nematic-isotropic transition curve initially rises and then falls in a normal manner. Transition temperatures are observed through hot stage polarizing microscope. Nematic mesophase is of threaded, type of texture in all the derivatives. Average thermal stability is relatively higher and series is of middle ordered melting type. Mesomorphic properties are compared with structurally similar homologous series. Analytical data support the structure of the molecules.