Tag: M.W=100-150

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

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

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

Cao, Xiamin published the artcileEffects of High Hydrostatic Pressure Combined with Blanching on Microorganisms and Quality Attributes of Cloudy and Clear Strawberry Juices, Application In Synthesis of 597-52-4, the publication is International Journal of Food Properties (2014), 17(9), 1900-1920, database is CAplus.

Effects of high hydrostatic pressure combined with blanching on microorganisms and quality attributes of strawberry juices were investigated. High hydrostatic pressure at 600 MPa/4 min/ambient temperature inactivated total aerobic bacteria, coliform bacteria, yeasts, and molds in juices, ensuring their microbiol. safety. Under this condition, the cloudiness of cloudy juices increased by 54.49% and its viscosity decreased by 12.40%. Ascorbic acid decreased by 7.82% in cloudy juices and 12.60% in clear juices. The content of total volatile flavor compounds increased by 13.21% in cloudy juices and decreased by 6.92% in clear juices. No significant changes in anthocyanins, total phenols, and antioxidant capacity were found with high hydrostatic pressure treatment.

International Journal of Food Properties published new progress about 597-52-4. 597-52-4 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic Chain, name is Triethylsilanol, and the molecular formula is C6H16OSi, Application In Synthesis of 597-52-4.

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

Chainet, Fabien published the artcileDevelopment of heart-cutting multidimensional gas chromatography coupled to time of flight mass spectrometry for silicon speciation at trace levels in gasoline samples, Application In Synthesis of 597-52-4, the publication is Journal of Chromatography A (2012), 80-86, database is CAplus and MEDLINE.

To improve the understanding of hydrotreatment (HDT) catalyst poisoning by silicon species, these mols. must be characterized in petroleum products using powerful anal. systems. Heart-cutting gas chromatog. coupled to time of flight mass spectrometry (GC-GC/TOFMS) method equipped with a Deans switch (DS) system was developed for the direct characterization of target silicon compounds at trace level (μg/kg) in gasoline samples. This method was performed to identify silicon compounds never characterized before. After the selection of the 2nd dimension column using GC-GC-FID, GC-GC/TOFMS was performed. The calibration curves obtained by the GC-GC/TOFMS method were linear up to 1000 μg kg^-1. Limits of detection (LOD) were ranging from 5 to 33 μg/kg in spiked gasoline. The method provided sufficient selectivity and sensitivity to characterize known silicon compounds thanks to their specific ions and their retention times. The anal. of a naphtha sample by GC-GC/TOFMS showed cyclic siloxanes (D_n) as major compounds of PDMS thermal degradation with the occurrence of linear siloxanes, especially hexamethyldisiloxane (L₂), which was never characterized in petroleum products but already known as severe poison for catalyst.

Journal of Chromatography A published new progress about 597-52-4. 597-52-4 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic Chain, name is Triethylsilanol, and the molecular formula is C6H16OSi, Application In Synthesis of 597-52-4.

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

Cao, Peng published the artcileZeolite-Encapsulated Cu Nanoparticles for the Selective Hydrogenation of Furfural to Furfuryl Alcohol, COA of Formula: C5H12O2, the publication is ACS Catalysis (2021), 11(16), 10246-10256, database is CAplus.

Catalytic hydrogenation of furfural (FFL) to furfuryl alc. (FAL) is one of the pivotal reactions for biomass valorization. Herein, well-defined Cu nanoparticles of ~1.8 nm encapsulated within titanium silicalite-1 (TS-1) have been successfully prepared by an in situ encapsulation approach, which possesses significant advantages in metal dispersion and uniformity compared to the traditional wet impregnation method. After a Na ion-exchange process for modulation of the zeolite microenvironment, the obtained Na-Cu@TS-1 catalyst affords an enhanced activity and selectivity in the selective hydrogenation of FFL into FAL, with a FFL conversion of 93.0% and a FAL selectivity of 98.1% at 110°C, 10 bar H₂, after a reaction time of 2 h. A turnover frequency value of 55.2 h^-1 has been achieved, reflecting some of the highest activity for Cu-based heterogeneous catalysts under similar conditions. Comprehensive characterization studies reveal that the confined environment of the zeolite could not only provide the spatial restriction for metal particles but also induce an electronic interaction between encapsulated Cu nanoparticles and Ti species in Na-Cu@TS-1, which both lead to effective suppression of the metal aggregation and leaching during catalysis. Na species, added by the ion exchange, not only mediate the acid/basic property of the zeolite for suppressing the side reactions but also modulate the encapsulated Cu species into an electronic-rich state, facilitating the FFL hydrogenation. Deactivation of Na-Cu@TS-1 is primarily caused by Na leaching into the liquid phase, but activity can be almost restored after a Na readdn. process.

ACS Catalysis published new progress about 111-29-5. 111-29-5 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Alcohol,Ploymers, name is Pentane-1,5-diol, and the molecular formula is C5H12O2, COA of Formula: C5H12O2.

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

Li, Zhiwen published the artcileNanoporous palladium-catalyzed silicon-based one-pot cross-coupling reaction of aryl iodides with organosilanes, SDS of cas: 597-52-4, the publication is Catalysis Science & Technology (2014), 4(6), 1734-1737, database is CAplus.

One-pot cross-coupling of aryl iodides with organosilanes was realized in excellent yield by utilizing dealloyed nanoporous palladium as a sustainable and heterogeneous catalyst. The reaction was completed under mild conditions and the catalyst was reused several times without evident loss of its catalytic activity.

Catalysis Science & Technology published new progress about 597-52-4. 597-52-4 belongs to alcohols-buliding-blocks, auxiliary class Aliphatic Chain, name is Triethylsilanol, and the molecular formula is C6H16OSi, SDS of cas: 597-52-4.

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

Shi, Jing published the artcileHeterocyclic analogs of phenol as novel potential antioxidants, Application of Thiophen-3-ol, the publication is Journal of Physical Organic Chemistry (2009), 22(11), 1038-1047, database is CAplus.

Five d. functional theory (DFT) methods including B3LYP, B3PW91, MPW1K, MPWB, TPSS1KCIS were evaluated by comparing with the exptl. O[bond]H bond dissociation enthalpies (BDEs) of substituted phenols. B3PW91 is the best method, for which the calculation error was 3.62 kJ/mol. Subsequently, the BDEs (O[bond]H) of hydroxyl groups on five- and six-membered heteroat. aromatic rings were calculated using the (RO)B3PW91/6-311++G(2df,2p)//(U)B3LYP/6-311g(d,p) procedure. The ionization energy (IE) and proton affinity [PA(O^–)] of these compounds also were examined From theor. study, imidazolols, thiazolols, and oxazolols were studied to assess their antioxidant activities. 5-Oxazolol could be a promising novel antioxidant precursor. Copyright © 2009 John Wiley and Sons, Ltd.

Journal of Physical Organic Chemistry published new progress about 17236-59-8. 17236-59-8 belongs to alcohols-buliding-blocks, auxiliary class Thiophene,Alcohol, name is Thiophen-3-ol, and the molecular formula is C12H13F2N3O4S, Application of Thiophen-3-ol.

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

Tian, Zhipeng published the artcileHydrodeoxygenation of guaiacol as a model compound of pyrolysis lignin-oil over NiCo bimetallic catalyst: Reactivity and kinetic study, Name: 4-Propylphenol, the publication is Fuel (2022), 122034, database is CAplus.

Catalytic hydrodeoxygenation (HDO) is a popular route to upgrade the pyrolysis lignin-oil that is abundant of phenolic compounds, and the synergistic effect of bimetal enables to improve the catalytic activity significantly. In this work, a series of non-noble metal catalysts are synthesized and their HDO performances of guaiacol are compared. Optimized NiCo/SiO₂-ZrO₂ catalyst expresses a 100% conversion and a 99.9% selectivity of cyclohexane product, which is higher than those over Ni/SiO₂-ZrO₂ catalyst. Catalyst characterization results demonstrate that the interaction between Ni and Co promotes the reduction of metal site and the adsorption of hydrogen, which is the crucial factor during HDO process. Besides, the electron transfer from Co to Ni species weakens the C-O bond of substrate intermediate and results in its cleavage to transform cyclohexanol to cyclohexane. This is also the rate determining step in the HDO of guaiacol. Specific kinetic study is conducted to verify the reaction pathway and the structure-activity relationship. The HDO reaction of guaiacol on NiCo/SiO₂-ZrO₂ fits the first order kinetic model well. The apparent Ea of 55.9 kJ·mol^-1 is lower than those of the noble metal catalysts reported in previous studies. In addition, the upgrading of raw pyrolysis lignin-oil on this non-noble bimetallic catalyst also achieves a high HDO efficiency, with the hydrocarbon contents increased from 4.2% to 60.6%. The good HDO performance of this cheap and easy-prepared NiCo catalyst proves its promising potential in the upgrading of lignin-oil for the production of hydrocarbon fuels.

Fuel 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 C7H5ClN2S, Name: 4-Propylphenol.

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

Zhang, Qifeng published the artcileSulfur(IV)-mediated umpolung α-heterofunctionalization of 2-oxazolines, Product Details of C8H10S, the publication is Chemical Science (2022), 13(18), 5164-5170, database is CAplus and MEDLINE.

The α-umpolung of carbonyl compounds significantly expands the boundaries of traditional carbonyl chem. Despite various umpolung methods available today, reversing the inherent reactivity ofcarbonyls still remains a substantial challenge. In this article, the authors report the first use of sulfonium salts, in lieu of well-established hypervalent iodines, for the carbonyl umpolung event. The protocol enables the incorporation of a wide variety of heteroatom nucleophiles into the α-carbon of 2-oxazolines. The success of this investigation hinges on the following factors: (1) the use of sulfoxides, which are abundant, structurally diverse and tunable, and easily accessible, ensures the identification of a superior oxidant namely phenoxathiin sulfoxide for the umpolung reaction; (2) the “assembly/deprotonation” protocol previously developed for rearrangement reactions in the authors’ laboratory was successfully applied here for the construction of α-umpoled 2-oxazolines.

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 C7H16ClNO2, Product Details of C8H10S.

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