Author: tianli

Li, Cheng published the artcileHighly efficient CO₂ fixation into cyclic carbonate by hydroxyl-functionalized protic ionic liquids at atmospheric pressure, Recommanded Product: 2-Morpholinoethanol, the publication is Molecular Catalysis (2021), 111756, database is CAplus.

We report an efficient strategy for CO₂ fixation into cyclic carbonates catalyzed by hydroxyl-functionalized protic ionic liquids (PILs) without any solvent and additive. Excellent yields of cyclic carbonates are obtained for the varied substrates under mild conditions (1 bar and 60°C). Mechanism studies have shown that hydroxyl promoted the activation of epoxide mols. through hydrogen bonding interaction, so that CO₂ can be easily converted into the desired product of cyclic carbonates. In addition, the hydroxyl-functionalized PILs can also be recycled repeatedly. This hydroxyl-functionalized PILs-catalyzed process is proved to be a promising scheme for the chem. conversion of CO₂.

Molecular Catalysis published new progress about 622-40-2. 622-40-2 belongs to alcohols-buliding-blocks, auxiliary class Morpholine,Alcohol, name is 2-Morpholinoethanol, and the molecular formula is C6H13NO2, Recommanded Product: 2-Morpholinoethanol.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Cheng, Jinling published the artcileA Single 2-(2′-Hydroxyphenyl)benzothiazole Derivative Can Achieve Pure White-Light Emission, Application of 2-Hydroxy-4-(trifluoromethyl)benzoic acid, the publication is Chemistry – An Asian Journal (2014), 9(11), 3215-3220, database is CAplus and MEDLINE.

The synthesis and photophysics of two novel 2-(2′-hydroxyphenyl)benzothiazole (HBT) derivatives are presented. The electron-withdrawing trifluoromethyl (CF₃) group in compound 1 facilitates the deprotonation of the phenolic hydroxy group. Well-resolved triple fluorescence from the enol, keto, and phenolic anion, which ranges from 350 to 600 nm, was detected for 1 in ethanol, which marks the first time triple fluorescence from an excited-state intramol. proton transfer (ESIPT) mol. was reported. Both triphenylamine and CF₃ were introduced into derivative 2. Intramol. charge transfer and the “red-edge effect” resulted in the bathochromic shift of dual fluorescence of 2. Triple fluorescence was also observed for 2 in ethanol. In mixed acetonitrile and ethanol, pure white-light emission with CIE coordinates of (0.33, 0.33) and a quantum yield of 0.25 was achieved for 2. This work provides a new avenue for the rational design of an ESIPT mol. to achieve white-light generation under mild conditions.

Chemistry – An Asian Journal published new progress about 328-90-5. 328-90-5 belongs to alcohols-buliding-blocks, auxiliary class Trifluoromethyl,Fluoride,Carboxylic acid,Benzene,Phenol, name is 2-Hydroxy-4-(trifluoromethyl)benzoic acid, and the molecular formula is C8H5F3O3, Application of 2-Hydroxy-4-(trifluoromethyl)benzoic acid.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Cheng, Jinling published the artcileComprehensive Studies on Excited-State Proton Transfer of a Series of 2-(2′-Hydroxyphenyl)benzothiazole Derivatives: Synthesis, Optical Properties, and Theoretical Calculations, Safety of 2-Hydroxy-4-(trifluoromethyl)benzoic acid, the publication is Journal of Physical Chemistry C (2015), 119(8), 4242-4251, database is CAplus.

A group of novel 2-(2′-hydroxyphenyl)benzothiazole derivatives (1-4) with excited-state intramol. proton transfer (ESIPT) character were synthesized. Their photophys. properties were studied by means of steady-state absorption and fluorescence spectra and time-resolved emission method as well as theor. calculation in a variety of solvents. All of these compounds can yield single fluorescence at the green region in nonpolar solvents such as n-hexane, while dual fluorescence consisting of the blue and green bands was captured in strong polar solvents like acetonitrile. In addition, a third emission band between the former two bands was detected for these mols. simultaneously with the blue and green ones generating the well-structured triple fluorescence in protic solvent like ethanol. Systematical comparison of the fluorescence of these compounds in a series of solvents demonstrated that nonpolar solvents would facilitate ESIPT process and the green emission from the keto format, while the strong polar solvents impede the ESIPT process and favor the blue normal emission from enol. Protic solvents facilitate deprotonation and make the phenolic anion coexist with keto and enol and consequently lead to triple fluorescence. On the premise of identical keto emission intensity, the normal emission intensity of these compound increases consecutively in the order of increasing electron-withdrawing ability of the substituents regardless of solvents. The results of quantum-chem. calculations are well in line with the exptl. spectra.

Journal of Physical Chemistry C published new progress about 328-90-5. 328-90-5 belongs to alcohols-buliding-blocks, auxiliary class Trifluoromethyl,Fluoride,Carboxylic acid,Benzene,Phenol, name is 2-Hydroxy-4-(trifluoromethyl)benzoic acid, and the molecular formula is C8H5F3O3, Safety of 2-Hydroxy-4-(trifluoromethyl)benzoic acid.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Kong, Xiangchen published the artcileCritical Roles of the Oxygen-Containing Functional Groups via β-O-4 Lignin Linkage Hydrogenolysis over Copper Catalysts, Safety of 2-Phenoxy-1-phenylpropane-1,3-diol, the publication is ACS Sustainable Chemistry & Engineering (2021), 9(32), 10939-10947, database is CAplus.

The fundamental understanding of the catalytic performance of copper-based catalysts for lignin hydroconversion is delayed compared with the empirical optimization of the catalyst preparation Herein, we investigate the interplay between the lignin-abundant oxygen-containing functional groups and Cu active species via the catalytic β-O-4 lignin linkage hydrogenolysis. Catalyst performance data and elemental spectra characterizing the catalyst demonstrate the dominance of Cu⁰ in the catalysis. Remarkably, C_α-OH and C_α=O in the aliphatic chain play critical roles in this process, without which the linkage cannot be broken. These groups markedly accelerate the linkage cleavage by decreasing both the chemisorption energy between C_β-O and Cu⁰ and the bond dissociation energy of the linkage. On the contrary, the methoxyl groups attached to the aromatic rings hinder the bond cleavage as a result of the steric effect. Such hindrance is significantly affected by the amount and position of the methoxyl groups. The results of this work highlight the importance of the unique structures of lignin in its reductive depolymerization catalyzed by copper-based catalysts, which appear to offer an opportunity for tailoring efficient copper-based catalysts for lignin hydrogenolysis.

ACS Sustainable Chemistry & Engineering published new progress about 70110-65-5. 70110-65-5 belongs to alcohols-buliding-blocks, auxiliary class Benzene,Alcohol,Ether,Benzene Compounds, name is 2-Phenoxy-1-phenylpropane-1,3-diol, and the molecular formula is C15H16O3, Safety of 2-Phenoxy-1-phenylpropane-1,3-diol.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Kong, Xiangchen published the artcileCatalytic hydroprocessing of stubborn lignin in supercritical methanol with Cu/CuMgAlO_x catalyst, Application In Synthesis of 645-56-7, the publication is Fuel Processing Technology (2021), 106869, database is CAplus.

Stubborn lignin (SL) is the thermochem. stable fragment generated from biomass utilization (e.g., pyrolysis, hydrolysis, fermentation, pulping), which is comparatively difficult to be further depolymerized into value-added bio-products. The cleavage of the stubborn linkages within the structure of SL, such as C-C, α-O-4, and 4-O-5 linkages, is the key for its valorization. Herein, we investigated the depolymerization of SL through catalytic hydroprocessing in supercritical methanol with Cu/CuMgAlO_x catalyst. The yield of monomers reached 37.76C% with 240 min at 300 °C. Cyclohexanols were identified as the major monomeric products, indicating the occurrence of hydrodeoxygenation and hydrogenation. GPC, quant. ¹³C NMR, HSQC NMR, and HMBC NMR analyses evidenced the depolymerization of SL and upgrading of its derivatives Furthermore, the mechanistic studies were carried out to provide insights to the stubborn linkage cleavages. The degrees of difficulty to break up the three involved linkages obeyed the sequence of β-5 > 4-O-5 > α-O-4. The apparent activating energies (E_a), chemisorption energies (E_c), and bond dissociation energies (BDE) were determined computationally to support the exptl. results from the perspectives of kinetics, chemisorption, and thermodn., resp. This research provides a reliable way for the utilization of SL.

Fuel Processing Technology published new progress about 645-56-7. 645-56-7 belongs to alcohols-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 4-Propylphenol, and the molecular formula is C9H12O, Application In Synthesis of 645-56-7.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Huang, Jinbao published the artcileDensity functional theory studies on pyrolysis mechanism of β-O-4 type lignin dimer model compound, Category: alcohols-buliding-blocks, the publication is Journal of Analytical and Applied Pyrolysis (2014), 98-108, database is CAplus.

Lignin is the main component of biomass with a complex, heterogeneous, three-dimensional polymeric structure of three main monolignols (p-coumaryl, coniferyl, and sinapyl alc.). In order to understand the pyrolysis mechanism of lignin and identify the chem. pathways for the formations of key products during pyrolysis, the pyrolysis processes of β-O-4 type lignin dimer model compound 1 (1-phenyl-2-phenoxy-1,3-propanediol) were theor. investigated by employing d. functional theory (DFT) methods at the B3LYP/6-31G(d,p) level. Based on related exptl. and calculation results of bond dissociation energies of β-O-4 type lignin dimer, three possible pyrolytic pathways (the homolytic cleavage of Cβ-O bond, the homolytic cleavage of Cα-Cβ bond and the concerted reactions) were proposed, the activation energies of each reaction step were calculated, and the temperature effect on pyrolysis processes was analyzed. The calculation results indicate that the homolytic cleavage reaction of Cβ-O bond and concerted reaction pathways could be the major reaction channels, and the homolytic cleavage reaction of Cα-Cβ bond and concerted reaction pathways could be the competitive reaction channels in pyrolysis processes. The concerted reactions would dominate over free-radical homolytic reactions at lower temperatures, while at high temperatures the free-radical reaction (C-O homolysis) would dominate over the concerted reactions.

Journal of Analytical and Applied Pyrolysis published new progress about 70110-65-5. 70110-65-5 belongs to alcohols-buliding-blocks, auxiliary class Benzene,Alcohol,Ether,Benzene Compounds, name is 2-Phenoxy-1-phenylpropane-1,3-diol, and the molecular formula is C15H16O3, Category: alcohols-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Han, Yue published the artcileCould preoxidation always promote the subsequent hydroconversion of lignin? Two counterexamples catalyzed by Cu/CuMgAlO_x in supercritical ethanol, SDS of cas: 645-56-7, the publication is Bioresource Technology (2021), 125142, database is CAplus and MEDLINE.

In this study, two counterexamples of lignin preoxidation-hydroconversion were reported. First, two lignin feedstocks were preoxidized with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) in acetonitrile with various dosages (15%, 30%, and 60%). Then, these preoxidized lignins (HELOs and MWLOs) were hydroconverted in supercritical ethanol catalyzed by Cu/CuMgAlO_x. Total yields from HELOs were all higher than those from HEL, indicating the good promotion of DDQ preoxidation on the subsequent hydroconversion of HELOs, especially with the DDQ dosage of 15%. Differently, the promotion effect of DDQ preoxidation on the hydroconversion of MWLOs depended on the DDQ dosage as well as the reaction time. Through the comparison of two counterexamples, this work bursted the myth that preoxidation can always promote the subsequent hydroconversion of lignin, revealed the influence of lignin property, preoxidation degree, and reaction conditions on the subsequent hydroconversion of preoxidized lignin, and presented the new insight into the preoxidation-hydroconversion strategy for lignin.

Bioresource Technology published new progress about 645-56-7. 645-56-7 belongs to alcohols-buliding-blocks, auxiliary class Liquid Crystal &OLED Materials, name is 4-Propylphenol, and the molecular formula is C9H12O, SDS of cas: 645-56-7.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Mamat, Marhaba published the artcileA visible-light-induced thiol addition/aerobic oxidation cascade reaction of epoxides and thiols for the synthesis of β-hydroxylsulfoxides, Safety of 2-Phenylethanethiol, the publication is Organic & Biomolecular Chemistry (2021), 19(45), 9855-9859, database is CAplus and MEDLINE.

A photochem. thiol addition/aerobic oxidation cascade reaction had been developed. This protocol enabled efficient oxidative coupling of epoxides and thiols to access structurally valuable β-hydroxylsulfoxides RSO₂CH₂C(R¹R²)OH [R = 4-MeC₆H₄, 4-ClC₆H₄, 4-MeOC₆H₄, etc.; R¹ = H, Me; R² = Me, Et, CO₂Et, etc.]. A broad range of functional groups were compatible to obtain moderate to good yields of the target products. Mechanistic studies revealed a sequential reaction pathway involving base-promoted thiol addition of thiols to epoxides and visible-light-induced aerobic oxygenation of thioethers.

Organic & Biomolecular Chemistry published new progress about 4410-99-5. 4410-99-5 belongs to alcohols-buliding-blocks, auxiliary class Thiol,Benzene, name is 2-Phenylethanethiol, and the molecular formula is C8H10S, Safety of 2-Phenylethanethiol.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Cheng, Tairan published the artcileCu-catalyzed carboboration of acetylene with Michael acceptors, Category: alcohols-buliding-blocks, the publication is Chemical Science (2022), 13(25), 7604-7609, database is CAplus and MEDLINE.

A copper-catalyzed three-component carboboration of acetylene with B₂Pin₂ and Michael acceptors is reported. In this reaction, a cheap and abundant C2 chem. feedstock, acetylene, was used as a starting material to afford cis-alkenyl boronates bearing a homoallylic carbonyl group. The reaction was robust and could be reliably performed on the molar scale. Furthermore, the resulting cis-alkenyl boronates could be converted to diverse functionalized mols. with ease.

Chemical Science published new progress about 4410-99-5. 4410-99-5 belongs to alcohols-buliding-blocks, auxiliary class Thiol,Benzene, name is 2-Phenylethanethiol, and the molecular formula is C8H10S, Category: alcohols-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts

Pospisil, Jan published the artcileAntioxidants and stabilizers. XXII. Comparison of the antioxidative activities of dihydric phenols and their oxidation products, Formula: C14H22O2, the publication is European Polymer Journal (1970), 6(10), 1347-58, database is CAplus.

The effects of 4-tert-alkyl pyrocatechols (I) and their oxidation produces on the autoxidation of Tetralin (initiated at 60° with azobisisobutyronitrile) were investigated. Whereas I act as oxidation inhibitors, 4-tert-alkyl 1,2-benzoquinones have pronounced retardation effects and 2-hydroxy-5-tert-alkyl 1,4-benzoquinones have only negligible effects. Similar investigations were carried out with 2-tert-alkyl hydroquinones, the inhibition activities of which are 2.5 to 3.5 times lower than those of I. The oxidation products of alkylhydroquinones (2-tertalkyl 1,4-benzoquinones and 2-hydroxy-6-tert-alkyl 1,4-benzoquinones) are much weaker oxidation retarders than quinones derived from alkylpyrocatechols. The antioxidative activity of I and 2-tert-alkyl hydroquinones in the stabilization of Tetralin is influenced by the same substituent factors as in the oxidation of isotactic polypropylene. Conclusions concerning the structural factors influencing the antioxidative activity of these quinoid compounds can be extrapolated to the polymeric substrate.

European Polymer Journal published new progress about 1139-46-4. 1139-46-4 belongs to alcohols-buliding-blocks, auxiliary class Benzene,Phenol, name is 4-(2,4,4-Trimethylpentan-2-yl)benzene-1,2-diol, and the molecular formula is C14H22O2, Formula: C14H22O2.

Referemce:
https://en.wikipedia.org/wiki/Alcohol,
Alcohols – Chemistry LibreTexts