Category: 50670-76-3

Mehravar, Ehsan published the artcilePhase behavior of side-chain liquid-crystalline polymers containing biphenyl mesogens with different spacer lengths synthesized via miniemulsion polymerization, Safety of Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, the publication is Polymer Chemistry (2016), 7(29), 4736-4750, database is CAplus.

The synthesis of a series of methacrylate side-chain liquid crystal polymers (SCLCPs) bearing biphenyl mesogen with different spacer lengths and a fixed tail, poly[ethyl 4′-((n-(methacryloyloxy)alkyl)oxy)-[1,1′-biphenyl]-4-carboxylate]s (n-PMLCM, n = 3, 4, 5, 6), in aqueous media by free radical miniemulsion polymerization is described. This method offers the advantage of producing high molar masses (>10⁵ Da) and full monomer conversion, not possible to achieve with conventional routes (solution polymerization). The resulting n-PMLCMs proved to have high thermal stability. The phase behaviors of the polymers were investigated by a combination of techniques including differential scanning calorimetry, polarized light microscopy, and small and wide angle X-ray scattering. The results show mesomorphic liquid crystalline behavior with a monolayer structure where the side-groups on both sides of the backbone would be interpenetrated. The liquid crystal phase transition of n-PMLCM follows the sequence smectic E (smectic E or smectic C for 4-PMLCM) ↔ smectic A ↔ isotropic liquid The transition temperatures and the associated entropy changes exhibit a distinct odd-even effect as the length and parity of the spacer are varied, with the odd members exhibiting the higher values. The high molar masses achievable using miniemulsion polymerization translate into a more perfect and stable ordering, characterized by larger lamellar domains and higher transition temperatures, than in low molar mass SCLCPs. Compared to polymeric liquid crystals with similar mesogens but shorter tails, we found that longer tails facilitate the ordering of the mesogens and allow more efficient packing around the backbones, imparting a high stability to the smectic phases formed.

Polymer Chemistry published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Safety of Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Ahmed, Sabbir published the artcileDesign, synthesis and biochemical evaluation of AC ring mimics as novel inhibitors of the enzyme estrone sulfatase (ES), Application In Synthesis of 50670-76-3, the publication is Bioorganic & Medicinal Chemistry Letters (2002), 12(10), 1343-1346, database is CAplus and MEDLINE.

4-(4-RC₆H₄)C₆H₄O₃SNH₂ [= H, CN, CO₂Me, CO₂Et, CO₂Pr, CO₂Bu] were preparedas novel inhibitors of the enzyme estrone sulfatase (ES). The results of the study show that these compounds are potent inhibitors, possessing greater inhibitory activity than coumate, but weaker inhibitory activity than emate or the tricyclic derivative of coumate, namely 667-coumate. Furthermore, the compounds are observed to be irreversible inhibitors.

Bioorganic & Medicinal Chemistry Letters published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Application In Synthesis of 50670-76-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Kang, Suk Hoon published the artcilePhotoimaging through in-Situ Photopolymerization of Heterobifunctional Mesogenic Compounds in Liquid Crystalline State, Category: esters-buliding-blocks, the publication is Macromolecules (Washington, DC, United States) (2007), 40(23), 8349-8354, database is CAplus.

A series of heterobifunctional mesogenic biphenyl esters having two different polymerizable groups, i.e., acryl and diacetylene groups, were synthesized and their thermal behaviors and polymerization investigated. All compounds showed enantiotropic transitions. Under POM, highly birefringent focal-conic fan textures appeared on heating and cooling from the isotropic melt. Compounds 6-8 having a Bu spacer between a biphenyl and a diacetylene group exhibited LC phases even at room temperature The x-ray diffractograms of compounds 6-8 showed a set of reflections in the small-angle region. They consisted of more than three sharp diffraction peaks with d spacings in the ratio of 1:1/2:1/3, showing that the compounds had well-defined smectic A structures. For the photoimaging a mixture of 6 and a photoinitiator (2,2-dimethoxy-2-phenylacetophenone, 4 wt %) was cast on a glass plate and sheared with a cover glass at room temperature to result in an LC monodomain. The acryl group was then selectively polymerized by irradiation with low-intensity 365 nm UV light to yield a polymer film. Subsequent UV irradiation at 254 nm using a 100 W high-pressure mercury arc lamp through a photomask produced conjugated polyacetylene chains in the irradiated area. The polydiacetylene chains were fluorescent, and the patterned image was directly visualized by fluorescence microscopy.

Macromolecules (Washington, DC, United States) published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Liu, Jui-Hsiang published the artcilePreparation and characterization of chiral polyacrylates end-capped with bornyl groups in the side chains, Category: esters-buliding-blocks, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2004), 42(5), 1075-1092, database is CAplus.

Chiral polyacrylates with bornyl end-capped side chains with four kinds of mesogenic moieties (azobenzene, biphenyl, benzoyloxy biphenyl, and Ph benzoate) were prepared The phase properties of the polymers were investigated with X-ray diffraction, differential scanning calorimetry, and polarizing optical microscopy. The thermogravimetric characteristics, the glass-transition temperatures and weight-average mol. weights, of the homopolymers were evaluated. The optical properties of the synthesized polymers in diluted solutions and in the thin-film state were also evaluated. The optical behavior of the composite films upon photoirradiation was investigated through the change in the transmittance of the probe light triggered by UV (365-nm) irradiation UV irradiation and heat treatment caused a reversible intensity change of the probe light at λ = 400 nm. The shrinkage of the photoisomerization of the composite films was also investigated with at. force microscopy. A spot contraction appeared on the surface when it was irradiated with a laser light spot. The contraction was recovered by heat treatment at 80° for 10 min.

Journal of Polymer Science, Part A: Polymer Chemistry published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Kutsumizu, Shoichi published the artcileSmectic C to Cubic Phase Transition of 4′-n-Docosyloxy-3′-nitrobiphenyl-4-carboxylic Acid (ANBC-22) and Alternating-Current Electric Field Effect, COA of Formula: C15H14O3, the publication is Journal of Physical Chemistry B (2009), 113(3), 640-646, database is CAplus and MEDLINE.

Smectic C (SmC) to cubic (Cub) phase transition behavior of 4′-n-docosyloxy-3′-nitrobiphenyl-4-carboxylic acid (ANBC-22) and alternating-current (AC) elec. field effect on the SmC phase were examined The most important and unexpected finding is that even at a temperature 8 K below the zero-field SmC to Cub phase transition temperature (T_SmC-Cub ≈ 408 K) determined previously for the compound and without field, the Cub phase growth occurs, after a very long induction period of several hours. The X-ray diffraction measurements revealed the formation of an Im3m-type Cub phase at the temperature It is suggested that the “true” transition temperature, which is difficult to determine precisely, exists around 396 K. The time-dependence of the Cub phase growth both without field and under field was analyzed using the well-known Avrami equation, implying the nucleation and growth mechanism mainly operating in the SmC to Cub phase transformation. The fact uncovered is that between 408 and 396 K, the SmC to Cub transformation is virtually prohibited by the strongly limited nucleation. It is concluded that the effect of the elec. field on the transition is to promote the nucleation of the Cub phase in the temperature region where the Cub phase is potentially more stable than the precursory SmC phase.

Journal of Physical Chemistry B published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, COA of Formula: C15H14O3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Lopez-Velazquez, Delia published the artcileStructure and Phase Transitions of Ethyl-4′-n-undecyloxybiphenyl-4-carboxylate and Its Acid Derivative, SDS of cas: 50670-76-3, the publication is Molecular Crystals and Liquid Crystals (2008), 222-236, database is CAplus.

Ethyl-4′-n-undecyloxybiphenyl-4-carboxylate, 2(11)OBC, and 4′-n-undecyloxybiphenyl-4-carboxylic acid, (11)OBC, are smectic liquid crystals precursors of low mol. weight premesogens, and of potential liquid crystal macromols. The single-crystal X-ray study of 2(11)OBC showed that it crystallizes in a non-centrosym. space group with mols. stacked along the short axis [010] and [001] without significant π···π or CH···π interactions. Such an arrangement may explain its strong tendency to form smectic mesophases. Both biphenyl derivatives have a rich polymesomorphism whose phase sequences were determined by DSC, optical microscopy and diffraction profiles using synchrotron radiation. These profiles indicated quite similar phase transitions in the two samples, although very different transition temperatures The phase transitions (on cooling) of 2(11)OBC are: Isotropic → SmA (101°) → SmB (88°) → SE (79°) → crystal phase (43°), while those (on cooling) of (11)OBC are the following: Isotropic → SmA (246°) → SmB (192°) → SX (162°) → SE (148°) → crystal phase (62°). The much higher transition temperatures for the acid derivative are explained by considering that this mol. forms dimers through classical O-H···O hydrogen bonds involving the carboxylic groups.

Molecular Crystals and Liquid Crystals published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, SDS of cas: 50670-76-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Tang, Ting published the artcileExperimental evidence for the formation of cationic intermediates during iodine(III)-mediated oxidative dearomatization of phenols, Synthetic Route of 50670-76-3, the publication is Organic & Biomolecular Chemistry (2018), 16(37), 6871-6874, database is CAplus and MEDLINE.

Iodine(III)-based oxidants are commonly used reagents for the oxidative dearomatization of phenols. Having a better understanding of the mechanism through which these reactions proceed is important for designing new iodine(III)-based reagents, catalysts, and reactions. A Hammett anal. of the oxidative dearomatization of substituted 4-phenylphenols was performed. This study confirms that iodine(III)-mediated oxidative dearomatizations likely proceed through cationic phenoxenium ions and not the direct addition of a nucleophile to an iodine-bound phenol intermediate.

Organic & Biomolecular Chemistry published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C11H17BO3S, Synthetic Route of 50670-76-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Srinivasa, H. T. published the artcileSynthesis of novel aryloxysilylethers using hexamethyldisilazane and laponite RD catalyst, Recommanded Product: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, the publication is Organic Chemistry: An Indian Journal (2012), 8(4), 130-134, database is CAplus.

The synthesis and characterization of some novel aryloxysilylethers from structurally diversified phenols and biphenols bearing alkyl-, alkoxy-, benzyl-, and ketone substituents is reported. Laponite RD was found to be a simple versatile catalyst for the conversion.

Organic Chemistry: An Indian Journal published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C10H9ClN2O, Recommanded Product: Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Even, Catherine published the artcileAFM, x-ray diffraction and optical microscopy studies of faceted droplets of a thermotropic bicontinuous cubic mesophase, COA of Formula: C15H14O3, the publication is ChemPhysChem (2002), 3(12), 1031-1034, database is CAplus and MEDLINE.

Droplets of a new thermotropic cubic mesophase are observed at room temperature both by optical microscopy and at. force microscopy. With AFM, steps on the facets are involved in the faceting mechanism of these droplets. The AFM image shows the detail of a facet’s corner and a rough area in between.

ChemPhysChem published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, COA of Formula: C15H14O3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Lee, Myongsoo published the artcileHydrogen-Bonding-Mediated Formation of Supramolecular Rod-Coil Copolymers Exhibiting Hexagonal Columnar and Bicontinuous Cubic Liquid Crystalline Assemblies, HPLC of Formula: 50670-76-3, the publication is Macromolecules (1999), 32(25), 8531-8537, database is CAplus.

The preparation and characterization of the supramol. rod-coil copolymers directed by mol. recognition of 4,4′-bipyridine and 4-[poly(propyleneoxy)propyloxy]-4′-bis(biphenyl carboxylic acid) with d.p. of poly(propylene oxide) coil of eight (P-8-HP), 10 (P-10-HP), 15 (P-15-HP), 17 (P-17-HP), 21 (P-21-HP), 27 (P-27-HP) and 34 (P-34-HP) are described. The introduction of poly(propylene oxide) (PPO) coils with different lengths into the rodlike polymeric system induces a rich variety of self-assembled microstructures. In the crystalline phase, the supramol. rod-coil copolymers with DP of PPO 8-17 organize into a microphase-separated monolayer lamellar structure. In contrast, the supramol. rod-coil copolymers with DP of PPO 21-34 exhibit a hexagonal columnar crystalline phase. A dramatic phase change after crystalline melting of the polymers is observed with the variation of the coil length. The supramol. rod-coil copolymers P-8-HP and P-10-HP display a bicontinuous cubic mesophase with Ia3d symmetry, while the supramol. rod-coil copolymers P-15-HP, P-17-HP, and P-21-HP with a medium length of PPO coil exhibit a hexagonal columnar mesophase. Further increasing the length of coil, as in the case of P-27-HP and P-34-HP, suppresses liquid crystallinity and induces only crystalline polymers.

Macromolecules published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, HPLC of Formula: 50670-76-3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics