Synthesis, Characterization and study of Liquid Crystalline Properties For compound Containing 1,2,4-Oxadiazole ring

 This  study  is concerned  with  the  synthesis  and characterization  of two new  series  3-(4-pentoxyphenyl)-5-(4΄-substituted phenyl)-1,2,4-oxadiazole and 3-(4-pentoxy benzoyloxyphenyl)-5-(4΄-alkoxy benzoyloxy phenyl)-1,2,4oxadiazole of fifteen new compounds.The first series 3-(4-pentoxyphenyl)-5-(4΄-substituted phenyl)-1,2,4oxadiazole of ten compounds with the structural formula (6)a-jThis was prepared as following: at first by reaction of p-hydroxy benzaldehyde (1) with hydroxyl amine hydrochloride to give p-hydroxy benzaldoxime (2) which then dehydrated by acetic anhydride to give p-hydroxy benzonitrile (3). Alkylation of compound (3) give p-pentoxy benzonitrile (4) and this compound react with hydroxyl amine hydrochloride to give 4-petoxy benzamidoxime (5) which finally react with p-substituted benzoyl chloride to give 3-(4-pentoxyphenyl)-5-(4΄-substituted phenyl)-1,2,4-oxadiazole (6)a-j

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