Month: December 2022

Li, Huai-Ming published the artcileAn Iodine-Functionalized Metal-Organic framework for catalytic alkene bromination, Quality Control of 103-26-4, the publication is Inorganic Chemistry Communications (2022), 109529, database is CAplus.

An iodine-functionalized metal-organic framework (MOF), UiO-68-I, was synthesized. UiO-68-I showed good catalytic activity for dibromination of alkenes and alkynes with a low catalyst loading of 1% and was able to be recycled and recovered efficiently. Mechanistic studies suggest that UiO-68-I may trigger the formation of mol. bromine through a radical intermediate and thus accelerate the reaction. The activity and stability of UiO-68-I outperforms most earlier reports on organoiodine catalysts, showing the great potential of iodine-functionalized MOFs as recyclable heterogeneous hypervalent iodine reagents or catalysts.

Inorganic Chemistry Communications published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, Quality Control of 103-26-4.

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

Li, Xiao-Gen published the artcileHydrogenation of Esters by Manganese Catalysts, Quality Control of 103-26-4, the publication is Advanced Synthesis & Catalysis (2022), 364(4), 744-749, database is CAplus.

The hydrogenation of esters catalyzed by a manganese complex of phosphine-aminopyridine ligand was developed. Using this protocol, a variety of (hetero)aromatic and aliphatic carboxylates including biomass-derived esters and lactones were hydrogenated to primary alcs. R¹CH₂OH [R¹ = Me, Ph, 2-furyl, etc.] with 63-98% yields. The manganese catalyst was found to be active for the hydrogenation of Me benzoate, providing benzyl alc. with turnover numbers (TON) as high as 45,000. Investigation of catalyst intermediates indicated that the amido manganese complex was the active catalyst species for the reaction.

Advanced Synthesis & Catalysis published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, Quality Control of 103-26-4.

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

Ni, Zi-hao published the artcileCatalytic esterification, kinetics, and cold flow properties of isobutyl palmitate, Application In Synthesis of 110-34-9, the publication is Fuel (2019), 115368, database is CAplus.

Iso-Bu palmitate was synthesized by the esterification of palmitic acid and isobutanol with pyridine Bu bisulfate ionic liquid as the catalyst in a self-designed reactor. The kinetics of the esterification and cold flow properties of biodiesel were also studied. The optimal reaction conditions for the esterification are as follows: catalyst dosage, 6%; reaction time, 60 min; molar ratio of isobutanol to palmitic acid, 5:1; and reaction temperature, 100°C. The verification test was conducted under the optimal conditions, and the esterification rate was up to 98.79%. The kinetics of catalytic esterification was analyzed. The reaction orders was 1.49; the activation energy E_a was 57.38 kJ/mol; the frequency factor A was 2.70 × 10⁷; and the reaction kinetics model was – dc_A/dt = 2.70 × 10⁷e^-(57.38/RT)c^1.49_A. The solidifying point (SP), cold filter plugging point (CFPP), and kinematic viscosity of iso-Bu palmitate obtained were 3°C, 7°C, and 4.93 mm² s^-1, resp. Compared to Me palmitate, the SP decreased by six times, and CFPP decreased by 3.28 times. Therefore, the use of branched-chain alc. instead of methanol ester exchange descaling method can effectively reduce the SP and CFPP of biodiesel to improve cold flow properties of biodiesel.

Fuel published new progress about 110-34-9. 110-34-9 belongs to esters-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Ester, name is Isobutyl palmitate, and the molecular formula is C20H40O2, Application In Synthesis of 110-34-9.

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

Yu, Shuangjian published the artcileExtrudable Vitrimeric Rubbers Enabled via Heterogeneous Network Design, Product Details of C15H20O6, the publication is Macromolecules (Washington, DC, United States) (2022), 55(8), 3236-3248, database is CAplus.

The state-of-the-art reprocessing of vitrimers still struggles in crude hot-compression processes. The highly cross-linked nature and glass-like viscoelastic behavior of vitrimers critically restrict the network chain mobility, which limits the application of continuous processing techniques during reprocessing. Herein, a multiphase design strategy is outlined through incorporating highly cross-linked vitrimeric powders into a polymer matrix, followed by crosslinking with dynamic covalent bonds (DCBs) containing cross-linkers to form multiphase DCB-based networks. Accordingly, inhomogeneous stress distribution can be achieved inside the networks during deforming. The resulting high interfacial stress significantly accelerates the network relaxation upon mech. activation enabling extrudable reprocessability to the vitrimeric rubbers with ~100% recovery of overall performance. Moreover, the inhomogeneous stress distribution also promotes the chain orientation of the networks, leading to a remarkably mech. reinforcement of the samples without compromising the elasticity. We envisage that this design concept can indeed facilitate the vitrimers toward industrial applications, which is significant to the sustainable development of rubber industry.

Macromolecules (Washington, DC, United States) published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C8H15NO, Product Details of C15H20O6.

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

Feng, Haisheng published the artcileCross-linked charring strategy for mitigating hazards of smoke and heat of aluminum diethylphosphonate/polyamide 6 by caged octaphenyl polyhedral oligomeric silsesquioxanes, Application In Synthesis of 31570-04-4, the publication is Journal of Hazardous Materials (2022), 424(Part_C), 127420, database is CAplus and MEDLINE.

Aluminum diethylphosphonate (ADP) is a highly efficient phosphorus-based flame retardant, widely used in polyamide 6 (PA6). However, ADP/PA6 releases large amounts of heat and smoke under high heat flux, which commonly means serious hazards to life and property. Octaphenyl polyhedral oligomeric silsesquioxanes (OPS) is an organic-inorganic hybrid silicon compound, playing flame retardant role in condensed phase. In this work, combustion behaviors of OPS/ADP/PA6 were investigated by limited oxygen index (LOI), UL94 and cone calorimeter (CONE) tests. The LOI and UL94 rating results did not change obviously, while the CONE data and smoke d. data showed the synergistic effect of OPS and ADP in PA6. For 2.5%OPS/7.5%ADP/PA6, the peak values of heat, smoke and CO release rate (pk-HRR, pk-RSR, Ds, max with/without pilot flame and pk-COP) decreased by 60.2%, 82.1%, 45.9%/38.3% and 80.4% resp., compared with 10%ADP/PA6. Moreover, 2.5%OPS/7.5%ADP/PA6 produced 337.5% more residue than 10%ADP/PA6. TGA, TG-IR, SEM-EDS, XPS and py-GC/MS were used to further explore the synergistic mechanism of OPS and ADP. It was verified that the cross-linked charring strategy apparently has weakened the hazards of smoke and heat of PA6. This work proposed a possible tech. approach to solve both fire risk and heat/smoke hazards of PA6.

Journal of Hazardous Materials published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C42H63O3P, Application In Synthesis of 31570-04-4.

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

Tan, Shaobo published the artcileBase Catalyzed Thiol-Ene Click Chemistry toward Inner -CH=CF- Bonds for Controlled Functionalization of Poly(vinylidene fluoride), HPLC of Formula: 19788-49-9, the publication is Macromolecular Chemistry and Physics (2018), 219(11), n/a, database is CAplus.

A facile and controlled base catalyzed thiol-ene click chem. toward electron-deficient -CH-CF- double bonds in poly(vinylidene fluoride) PVDF (P(VDF-DB)) is reported in present contribution for the first time. The addition reaction is carefully conducted under varied conditions including at the elevated temperature, in the different solvents, and with the altered catalysts and thiols. The addition reaction is well confirmed to follow the base catalyzed route and exhibits close dependence onto the reaction conditions. Besides the addition reaction, the other two side reactions catalyzed by alkylamines, including the further main chain degradation of P(VDF-DB) substrates together with the nucleophilic substitution of thiols to -CH=CF- units, can be completely avoided by choosing a catalyst with a proper pK_a value. With respect to the universality and well controlled feature of the reaction, the low cost and readily prepared P(VDF-DB) substrate and the mild reaction conditions, this strategy may offer a robust tool for attaching various functional groups into PVDF side chain.

Macromolecular Chemistry and Physics published new progress about 19788-49-9. 19788-49-9 belongs to esters-buliding-blocks, auxiliary class Thiol,Aliphatic hydrocarbon chain,Ester, name is Ethyl 2-mercaptopropanoate, and the molecular formula is C8H11BO2, HPLC of Formula: 19788-49-9.

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

Shi, Min published the artcileCatalytic, asymmetric aza-Baylis-Hillman reaction of N-sulfonated imines with 2-cyclohexen-1-one and 2-cyclopenten-1-one in the presence of a chiral phosphine Lewis base, Related Products of esters-buliding-blocks, the publication is Tetrahedron: Asymmetry (2005), 16(7), 1385-1391, database is CAplus.

In the aza-Baylis-Hillman reaction of N-sulfonated imines with 2-cyclohexen-1-one or 2-cyclopenten-1-one the Baylis-Hillman adducts can be obtained in good yields and moderate enantiomeric excess. by using (R)-2′-dimethylphosphanyl-[1,1′]binaphthalenyl-2-ol as a chiral phosphine Lewis base.,. The structure of this chiral phosphine Lewis base on chiral induction in this reaction has also been discussed.

Tetrahedron: Asymmetry published new progress about 126613-06-7. 126613-06-7 belongs to esters-buliding-blocks, auxiliary class Chiral Diphenols, name is (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), and the molecular formula is C8H5F3O3, Related Products of esters-buliding-blocks.

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

Yang, Wenge published the artcileEffect of electron beam irradiation on volatile flavors in Tegillarca granosa meat, Category: esters-buliding-blocks, the publication is Zhongguo Shipin Xuebao (2012), 12(3), 176-184, database is CAplus.

The effect of electron beam irradiation on the volatile flavors in Tegillarca granosa meat was investigated. The volatile flavors in Tegillarca granosa meat were isolated by solid-phase microextraction and analyzed by gas chromatog./mass spectrometry after irradiation of different doses. After irradiation of 1 9kGy, the sorts of volatile flavors increased from 46 to 55, 57, 52, 58 and 66, resp. Volatile carbonyl compounds were the principal parts of volatiles, among which ketones made the contribution of sweet flower scent, while some aldehydes provided the lipid-like and fruity aromas. The unusual smell of 7 kGy group samples should be relevant to the abundant volatile carbonyl compounds The relative content of volatile alcs. increased after irradiation of 3, 5 kGy, containing some enols which might make the flavors softer. However, some kinds of olefins could to a certain extent remove the fishy smell. Electron beam irradiation brought about the increases of heterocyclic compounds Furan contributed to the fruity aromas in Tegillarca granosa meat. Besides, (S-and N-containing compounds including) pyridines and thiazoles provided the flavors of fried meat and nuts. Compared with the other exptl. groups, aromatic compounds exhibited the highest relative content with the dose of 5 kGy, among which benzaldehyde had the almond aroma, making the whole flavor of Tegillarca granosa meat better, to some degree. Electron beam irradiation with the doses of 3-5 kGy produced no significant impact on the original aromas of Tegillarca granosa meat. Furthermore, the irradiation might improve the whole flavors, to some extent.

Zhongguo Shipin Xuebao published new progress about 5340-78-3. 5340-78-3 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is Ethyltert-butylacetate, and the molecular formula is C11H8F2, Category: esters-buliding-blocks.

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

Zhou, Changqian published the artcileChemical composition, antibacterial activity and study of the interaction mechanisms of the main compounds present in the Alpinia galanga rhizomes essential oil, Application of Methyl 3-phenyl-2-propenoate, the publication is Industrial Crops and Products (2021), 113441, database is CAplus.

In this research, the antibacterial activity and the interaction mechanisms of the major chem. constituent present in the Alpinia galanga rhizomes essential oil (AGREO) were investigated. Et cinnamate, Me cinnamate and n-pentadecane were the major components of AGREO. The antibacterial mechanism of AGREO on Enterohemorrhagic Escherichia coli O157:H7 (EHEC O157) was evaluated and the results proved that the potent antibacterial activity of AGREO was due to higher passive permeability of bacterial cell membrane, followed by crucial intracellular components efflux. Addnl., AGREO disrupted the intracellular physiol. metabolism of EHEC O157, including inhibition of P-type ATPases activity and down-regulation expression of four virulence genes associated with EHEC infections. Notably, mol. docking studies suggested that Et cinnamate probably competed with the structural NAD(P)+ for the binding sites of glucose-6-phosphate dehydrogenase (G6PD), resulting in a decrease in G6PD activity with subsequent suppression of respiratory metabolism The spectroscopic techniques and mol. docking studies proved that the AGREO major components were prone to bind to the minor groove of DNA.

Industrial Crops and Products published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is 0, Application of Methyl 3-phenyl-2-propenoate.

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

Zang, Minghui published the artcileStudy on the synthesis, self-assembly and responsive behavior of azobenzene triblock copolymers, COA of Formula: C23H28N2O4, the publication is Zhongguo Keji Lunwen (2014), 9(6), 648-653, database is CAplus.

A new triblock copolymer poly(ethylene oxide)monomethyl ether-b-poly(acrylic aid)-b-poly[6-(4-methoxy-azobenzene-4′-oxy)hexyl methylacrylic acid] was synthesized by the atom transfer radical polymerization (ATRP) method. The self-assembly behaviors in aqueous media, pH value and photo-sensitive properties of this copolymer were studied by the means of transmission electron microscopy (TEM), SEM (SEM), laser light scattering (LLS) and UV-Vis spectrophotometer. It was found that the copolymer could self-assemble into vesicle structure. With decreasing the pH value, the particle size of the micelles increased sharply obviously bigger when pH<3.4; however, there was not significant change for the particle size of micelles when pH>3.4. Under the irradiation of polarized light, the aggregates were elongated with increasing the irradiation time.

Zhongguo Keji Lunwen published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C14H28O5S, COA of Formula: C23H28N2O4.

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