Non-symmetrical bent-core homologous series bearing 1,2,4-oxadiazole core with a cholesterol terminal arm: Synthesis, characterization and their liquid crystalline properties

Ali, Ghassan Q.; Tomi, Ivan Hameed R.

doi:10.1016/j.molstruc.2022.132610

Journal of Molecular Structure

2022

DOI: 10.1016/j.molstruc.2022.132610

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Non-symmetrical bent-core homologous series bearing 1,2,4-oxadiazole core with a cholesterol terminal arm: Synthesis, characterization and their liquid crystalline properties

Ghassan Q. Ali

Ivan Hameed R. Tomi

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2024

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Cited by 3 publications

References 49 publications

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Tetrafluoropyridinyl Thiolate as a Tool for Enabling Photoredox Alkylation of 1,2,4‐Oxadiazoles

Frumkin,

Levin,

Dilman

2024

Adv Synth Catal

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A method for the radical functionalization of 1,2,4‐oxadiazoles using alkyl halides as precursors of radicals is described. The reaction efficiency is determined by potassium tetrafluoropyridinyl thiolate additive, which plays dual role. First, the thiolate converts alkyl halides into more reactive fluorinated aryl sulfides, which undergo photoredox activation of the C‐S bond. Second, the thiolate decreases the unproductive loss of alkyl radicals by converting them back to the sulfides.

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Tetrafluoropyridinyl Thiolate as a Tool for Enabling Photoredox Alkylation of 1,2,4‐Oxadiazoles

Frumkin,

Levin,

Dilman

2024

Adv Synth Catal

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Mesogenic Behavior of New Derivatives Containing Azo‐Ester‐Imine Links with Different Substituted Alkoxy Groups as Terminal Tails

2022

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Two series of ten ester derivatives with four aromatic rings linked together by three different linkages (azo/ester/imine), 4-((4-substituted)diazenyl)phenyl 4-((4alkoxybenzylidene)amino)benzoate (IV n X=OCH 3 and V n X=Br) were synthesized. These derivatives have an alkoxy chain in the para position of the phenyl ring with different lengths (n = 3, 4, 6, 7, and 12) on one terminal side while the other side was substituted by methoxy and bromo groups linked to the pposition of phenyl. The structures of all synthesized derivatives were proven by nuclear magnetic resonance ( 1 H-NMR, 13 C-NMR), elemental analysis (C,H,N), and Fourier-transform infrared spectroscopy (FT-IR). The Mesophase textures of the final esters were observed by polarized optical microscopy (POM) and differential scanning calorimetry (DSC). Only the nematic texture was observed in the methoxy derivatives while nematic and smectic A textures were shown in the bromo mesogens. All the homologous showed mesogenic behavior with wide thermal stability. From the results, it was found that the liquid crystalline behaviors of these derivatives are dependent on the substituted group (-X) and the length of the alkoxy chain. The mesogenic behavior of these compounds was compared with other mesogens that have similar structures.

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Synthesis, characterization and photophysical study of cholesterol functionalized azo-based room temperature liquid crystals

Mali

Rathod

Sharma

et al. 2023

Journal of Molecular Structure

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Non-symmetrical bent-core homologous series bearing 1,2,4-oxadiazole core with a cholesterol terminal arm: Synthesis, characterization and their liquid crystalline properties

Cited by 3 publications

References 49 publications

Tetrafluoropyridinyl Thiolate as a Tool for Enabling Photoredox Alkylation of 1,2,4‐Oxadiazoles

Tetrafluoropyridinyl Thiolate as a Tool for Enabling Photoredox Alkylation of 1,2,4‐Oxadiazoles

Mesogenic Behavior of New Derivatives Containing Azo‐Ester‐Imine Links with Different Substituted Alkoxy Groups as Terminal Tails

Synthesis, characterization and photophysical study of cholesterol functionalized azo-based room temperature liquid crystals

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