New Liquid Crystalline 3,5-disubstituted 4,5-dihydro-1,2-oxazoles

Безбородов, В. С.; Kauhanka, N. N.; Лапаник, В. И.

doi:10.1080/15421400490434874

Cited by 10 publications

(7 citation statements)

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“…After accomplishing the synthesis of 4 a–c , two more steps were needed: (i) reduction of the nitro group by tin(II)chloride dehydrate, and (ii) oxidation of isoxazoline to isoxazole mediated by manganese dioxide, applied so that we could access 4,5‐dihydroisoxazolylanilines 5 a–c and isoxazolylanilines 7 a–c . Despite the non‐planar shape of the isoxazolines, compounds 5 a–c might be a component of liquid crystals as we have checked in previous works on similar isoxazolines …”

Section: Resultsmentioning

confidence: 77%

An old dog with new tricks: Schiff bases for liquid crystals materials based on isoxazolines and isoxazoles.

Fritsch

Merlo

2016

ChemistrySelect

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Schiff bases are in action again showing an exuberant mesophase range despite their chemical and thermal weakness. Two series of Schiff bases (SB), based on isoxazolines 9 a–f and isoxazoles 10 a–f, are described. 9 a–f were synthesized by a [3+2] cycloaddition 1,3‐dipolar of arylnitrile oxide from p‐nitrobenzaldehyde (1) and alkenes. And, subsequently oxidized to 10 a–f by MnO2. The isoxazolines and isoxazoles thus obtained were reduced to aniline derivatives and condensed with appropriated arylaldehydes. The SBs series isoxazolines 9 a–f presented a narrow mesophase range, while SBs series isoxazoles 10 a–f showed a large mesophase range. Nematic mesophase was observed for SBs with short and non‐polar groups, while SmA and SmC mesophase for SBs with long and more polar terminal groups. The stability of the SBs is also dependent on the clearing temperature. For 10 a–f with high clearing temperature, decomposition induced by heat was observed during the first cycle of heating and in solutions of CDCl3. Series 9 a–f was more resistant to the thermal decomposition.

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Section: Resultsmentioning

confidence: 77%

An old dog with new tricks: Schiff bases for liquid crystals materials based on isoxazolines and isoxazoles.

Fritsch

Merlo

2016

ChemistrySelect

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“…Recently the synthesis and properties of 2-isoxazoline-containing liquid crystals were reported [20][21][22]. Several of these compounds are 2-isoxazolines with 3-aryl and 5-alkyl substitutients [20].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of new liquid crystalline isoxazole‐, pyrazole‐ and 2‐isoxazoline‐containing compounds

Kauhanka

2006

Liquid Crystals

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“…Particularly, liquid crystalline compounds containing five-membered heterocyclic rings have been successfully evaluated. 16,17 It was found that non-linear heterocyclic liquid crystals, such as pyrazole, furan, thiophene, and isoxazole derivatives with terminally positioned heterocyclic ring form smectic or nematic phase at low temperature and in wide temperature range are well-studied. 18,19 In addition, presence of heteroatom has contributed to increasing molecular dipole and dielectric anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Pendant triazole ring assisted mesogen containing side chain liquid crystalline polymethacrylates: Synthesis and characterization

2011

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Two series of click chemistry assisted alkoxymethyl-1H-[1,2,3]-triazol-1-yl containing sidechain liquid-crystalline polymethacrylates were synthesized by free radical polymerization technique. Mesogen was linked to backbone through various spacer units. Monomers and polymers were characterized by FT-IR, 1 H and 13 C-NMR spectral techniques. Thermal stability of polymers was confirmed by thermogravimetric analysis. Mesomorphic property and phase transition temperature of polymers were analysed by differential scanning calorimetry and polarized optical microscopy. Phase transition temperature and mesomorphic property of polymers with respect to insertion of polar alkoxy group on terminal triazole ring and spacer length between backbone and mesogen were investigated. Polymers exhibited grainy like textures under polarized optical microscopy. Spacer length between mesogen and backbone alters phase transition temperature of the polymers.

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New Liquid Crystalline 3,5-disubstituted 4,5-dihydro-1,2-oxazoles

Cited by 10 publications

References 0 publications

An old dog with new tricks: Schiff bases for liquid crystals materials based on isoxazolines and isoxazoles.

An old dog with new tricks: Schiff bases for liquid crystals materials based on isoxazolines and isoxazoles.

Synthesis of new liquid crystalline isoxazole‐, pyrazole‐ and 2‐isoxazoline‐containing compounds

Pendant triazole ring assisted mesogen containing side chain liquid crystalline polymethacrylates: Synthesis and characterization

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