Liquid Crystalline Polymorphism of Methyl and Ethyl trans-4-{[4′-(alkanoyloxy)phenyl]diazenyl}benzoates
نویسندگان
چکیده
Authors present two new homologous series of liquid-crystalline compounds, methyl and ethyl 4-{[4-(alkanoyloxy)phenyl]diazenyl}benzoates, synthesis and investigation of their mesogenic properties. In the methyl series only nematic phase was detected and in the ethyl series nematic and smectic mesophases. In uence of the alkyl chain length on the phase transition temperatures and their entropic values are discussed and compared with literature data.
منابع مشابه
Synthesis of Azo-Bridged Benzothiazole-Phenyl Ester Derivatives via Steglich Esterification
We synthesized the five compounds of azo bridged ethoxybenzothiazole substituted phenyl ester derivatives by using Dicyclo Hexyl Carbodiimide (DCC) and a catalytic amount of Dimethyl amino pyridine (DMAP) as a nucleophile. All the compounds structures were confirmed by IR, NMR and mass spectrum. The synthesized compounds were screened for antioxidant property by DPPH radical scavenging method. ...
متن کامل(E)-2-{Ethyl[4-(4-nitrophenyldiazenyl)phenyl]amino}ethyl anthracene-9-carboxylate
The crystal structure of the title compound, C(31)H(26)N(4)O(4), displays a trans conformation for the nitro-phenyl-diazenyl portion of the mol-ecule. Packing diagrams indicate that weak C-H⋯O hydrogen bonds, likely associated with a strong dipole moment present in the mol-ecule, dictate the arrangement of mol-ecules in the crystal structure.
متن کاملMethyl 4-methylbenzoate
The structure of the title compound, C(9)H(10)O(2), is related to that of 4-methyl-phenyl 4-methyl-benzoate and ethyl-ene di-4-methyl-benzoate showing similar bond parameters. The mol-ecule is planar, the dihedral angle between the aromatic ring and the -COOMe group being 0.95 (6)°. The cystal structure exhibits inter-molecular C-H⋯O contacts that link mol-ecules into infinite chains extended i...
متن کاملSynthesis and anti-juvenile hormone activity of ethyl 4-(2-aryloxyhexyloxy)benzoates.
A series of ethyl 4-(2-aryloxyhexyloxy)benzoates was prepared and tested for their activity to induce precocious metamorphosis in larvae of the silkworm. Phenyl analog 5 showed activity comparable to that of the 6-methyl-3-pyridyl analog reported as a novel anti-JH agent. The activity of 5 could be fully counteracted by methoprene, a JH agonist. The ethoxycarbonyl group of 5 was essential for i...
متن کاملSynthesis of some new annulated pyrazolo-pyrido (or pyrano) pyrimidine, pyrazolopyridine and pyranopyrazole derivatives.
The bifunctional pyrazolopyridine (2) and pyrano-pyrazole (3) derivatives were prepared by the reaction of 2-(2,4-dinitrophenyl)-5-methyl-2,4-dihydro-3H-pyrazol-3-one (1) with p-methoxybenzaldehyde, malononitrile in the presence of ammonium acetate or piperidine, respectively. Compound 2 was used as the key intermediate to prepare the pyrazolo-pyrido-pyrimidine derivatives through its reaction ...
متن کامل