Month: December 2022

Liu, Hongpeng published the artcileShear deformation response of a holographic sensor based on elastic poly(MMA-co-LMA) photopolymer, HPLC of Formula: 142-90-5, the main research area is methyl lauryl methacrylate Shear photopolymer diffraction wavelength.

A holog. sensor based on camphorquinon doped poly (Me methacrylate-co-lauryl methacrylate) (poly (MMA-co-LMA)) elastic photopolymer is developed for characterizing the shear deformation of material. A shear angle and its transverse displacement, which are induced by a couple of shear stresses, are analyzed using a diffraction spectrum of a transmission holog. sensor. The dependence of the peak wavelength shift on the shear deformation presents a good linear relationship which provides a quant. characterization means. The detectable maximum of the shear angle exceeds 26.1 deg, and the peak wavelength shift closes to 4.0 nm. The available sensitivity is better than 3.33 deg/0.5 nm (shear angle/wavelength shift) using a com. spectrometer with 0.5 nm of resolution Finally, the reversibility response of shear deformation further confirmed the practical applicability of the elastic polymerbased shear deformation sensor. The spectrum measurement of shear deformation provides a novel measurement means for the mech. deformation of materials and expands the application of a holog. sensor.

Optics Letters published new progress about Diffraction. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, HPLC of Formula: 142-90-5.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Golubeva, M. A. published the artcileIn Situ Generated Nickel Phosphide Based Catalysts for Hydroprocessing of Levulinic Acid, Formula: C7H12O3, the main research area is nickel phosphide catalyst levulinic acid hydroconversion.

This article describes the production of unsupported nickel phosphide catalysts generated in situ in a reaction mixture from water-soluble and oil-soluble precursors during the hydroconversion of levulinic acid. These catalysts contain crystalline phases, specifically Ni12P5 and Ni(PO3)2. During the hydrogenation of levulinic acid in toluene in the presence of NiP-TOP, a lower temperature and a shorter reaction time contribute to the formation of γ-valerolactone (100% selectivity). A higher temperature and a longer reaction time favor the formation of valeric acid (94% selectivity). In the hydrogenation of levulinic acid in ethanol in the presence of NiP-H3PO2, the main reaction product is Et levulinate (95% selectivity).

Petroleum Chemistry published new progress about Deoxidation. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Formula: C7H12O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Golubeva, Maria A. published the artcileHydroprocessing of furfural over in situ generated nickel phosphide based catalysts in different solvents, SDS of cas: 539-88-8, the main research area is nickel phosphide catalyst furfural hydrodeoxygenation solvent.

The present work is dedicated to the nickel phosphide based catalysts, containing particles, generated in situ in the reaction medium from the different catalytic systems. The present catalytic systems exhibited high activity in the hydroprocessing of furfural. Full conversion of furfural depending on conditions was reached after 0.5-3 h of reaction at 250-350°C. 2-methylfuran was obtained as a main product in toluene with the highest selectivity of 77%. Et levulinate and 2-methylfuran with selectivity of 40% and 38% resp. were obtained as main products in ethanol under different conditions. Different reaction medium and nickel phosphide precursors had an influence on the obtained phases of catalysts. Ni12P5 and Ni2P were obtained in toluene from oil-soluble precursors and Ni12P5 was obtained in ethanol from water-soluble precursors.

Applied Catalysis, A: General published new progress about Deoxidation. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, SDS of cas: 539-88-8.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Golubeva, Maria A. published the artcileSelective production of γ-valerolactone and ethyl valerate from ethyl levulinate using unsupported nickel phosphide, COA of Formula: C7H12O3, the main research area is valerolactone ethyl valerate levulinate nickel phosphide.

Unsupported nickel phosphide catalyst containing Ni2P phase was applied in the hydrodeoxygenation of Et levulinate in ethanol medium for the first time. The obtained catalyst was investigated by XRF, XRD, NH3-TPD, XPS and TEM techniques. γ-Valerolactone and Et valerate were obtained as the hydrodeoxygenation products. Varying the temperature and the reaction time it was possible to obtain these products with high selectivity. γ-Valerolactone was selectively formed at 200-250°C and Et valerate was selectively formed at temperatures of 300-350°C. Increase in reaction time was contributed to Et valerate formation. The highest selectivity of Et valerate was 100% at full Et levulinate conversion at 350°C after 6 h. 100% γ-Valerolactone selectivity was reached at low conversion of Et levulinate. The highest yield of γ-valerolactone reached 41.7% after 6 h of the reaction at 250°C. The selectivity of γ-valerolactone was 86.9% and the conversion of Et levulinate was 48.0%.

Applied Catalysis, A: General published new progress about Deoxidation. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, COA of Formula: C7H12O3.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Li, Song published the artcileOne-pot hydrodeoxygenation of biomass furan derivatives into decane under mild conditions over Pd/C combined with phosphotungstic acid, Safety of Methyl decanoate, the main research area is furan hydrodeoxygenation decane production palladium carbon combined phosphotungstic acid.

One-pot hydrodeoxygenation (HDO) of biomass furan derivatives into long-chain alkanes remains unclear owing to the complicated reactions at high temperatures Here, Pd/C combined with phosphotungstic acid (HPW), a strong Bronsted solid acid promoter, was developed to produce decane under mild conditions through the one-pot HDO of δ-furfurylidenelevulinic acid (FDLA). A 93.16% sum yield of alkanes including 89.53% yield of decane was obtained under 3 MPa H2 at 170°C for 4 h. The ring-opening and HDO of furans are accomplished at preheating stage, which enable to clarify the complicated reaction pathway. In addition, exptl. validations and catalytic characterizations confirm that the synergistic effect of active acid-metal sites plays a critical role in the generation of alkanes via the formation and hydrogenolysis of lactone intermediates to aldehyde/alc. This work provides guidance for the one-pot HDO of biomass furan derivatives via the combination of metal catalyst and strong Bronsted solid acid under mild conditions.

Green Chemistry published new progress about Deoxidation. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, Safety of Methyl decanoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Beckwith, Athelstan L. J. published the artcileReactions of methyl-substituted 5-hexenyl and 4-pentenyl radicals, Category: esters-buliding-blocks, the main research area is hexenyl radical cyclization kinetics; methyl group hexenyl cyclization; pentenyl radical cyclization kinetics.

Relative and absolute kinetic data were determined for cyclization of Me-substituted 5-hexenyl radicals: 2-, 3- and 4-Me- and 2,2-, 3,3- and 4,4-diMe-substituted radicals, generated by interaction of Bu3SnH with the corresponding bromides. Each radical undergoes regiospecific or highly regioselective 1,5-cyclization more rapidly than the unsubstituted radical. The rate enhancements, which arise mainly from lowering of the activation energy, can be rationalized in terms of the gem-di-Me effect. 1,5-Cyclizations of monosubstituted species are stereoselective: 2- and 4-methyl-5-hexenyl radicals give mainly trans products, whereas 3-methyl-4-hexenyl radical gives mainly the cis. This behavior reflects the effect of the substituent on the stabilities of cyclic transition complexes in chair-like conformations. Cyclization of 2,2- or 3,3-dimethyl-4-pentenyl radical could not be detected.

Australian Journal of Chemistry published new progress about Cyclization. 86549-27-1 belongs to class esters-buliding-blocks, name is Ethyl 2,2-dimethylpent-4-enoate, and the molecular formula is C9H16O2, Category: esters-buliding-blocks.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Padwa, Albert published the artcileA Rh(II)-catalyzed cycloaddition approach toward the synthesis of komaroviquinone, Safety of Ethyl 2,2-dimethylpent-4-enoate, the main research area is komaroviquinone icetexane core synthesis cyclization cycloaddition rhodium catalyzed.

Using a rhodium(II)-catalyzed cyclization/cycloaddition sequence as the key reaction step, the icetexane core of komaroviquinone (I) was constructed by an intramol. dipolar-cycloaddition of a carbonyl ylide dipole across a tethered π-bond. The ylide was arrived at by cyclization of a rhodium carbenoid intermediate onto a proximal ester group. Efforts toward the preparation of the required precursor for elaboration to the natural product are discussed.

Tetrahedron published new progress about Cyclization. 86549-27-1 belongs to class esters-buliding-blocks, name is Ethyl 2,2-dimethylpent-4-enoate, and the molecular formula is C9H16O2, Safety of Ethyl 2,2-dimethylpent-4-enoate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Padwa, Albert published the artcileEfficient Construction of the Oxatricyclo[6.3.1.00,0]dodecane Core of Komaroviquinone Using a Cyclization/Cycloaddition Cascade of a Rhodium Carbenoid Intermediate, Formula: C9H16O2, the main research area is oxatricyclododecane core komaroviquinone preparation cyclization cycloaddition cascade rhodium carbenoid.

The rhodium(II)-catalyzed cyclization/cycloaddition cascade of a o-carbomethoxyaryl diazo dione is described as a potential route to the oxatricyclo[6.3.1.00,0]dodecane substructure I (R = H, Me) of the icetexane diterpene komaroviquinone. The initially formed carbonyl ylide dipole prefers to cyclize to an epoxide at 25 °C but can be induced to undergo cycloaddition across the tethered π-bond at higher temperatures

Organic Letters published new progress about Cyclization. 86549-27-1 belongs to class esters-buliding-blocks, name is Ethyl 2,2-dimethylpent-4-enoate, and the molecular formula is C9H16O2, Formula: C9H16O2.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Liu, Ya published the artcileGelator-Enhanced Organohydrogels with Switchable Mechanics and High-Strain Shape-Memory Capacity, Recommanded Product: Dodecyl 2-methylacrylate, the main research area is gelator organogel hydrogel.

Hydrogels and organogels, as two crucial representatives of soft materials, have attracted immense interest. However, they develop independently along two parallel lines, and these gels with single networks have their inherent drawbacks. For example, hydrogels tend to freeze, and organogels are usually brittle. Herein, organogels were incorporated into a hydrogel matrix for the synthesis of organohydrogels GOHs through polymerization in Pickering emulsion. The rigid organogel domains contribute to enhancing the strength of organohydrogels. Besides this, the organogels derived from 12-HAS self-assembly behavior exhibit a gel-sol transition when the temperature reaches 70°C, thus leading to a thermo-softening behavior in the GOHs. Due to the phase transition of organogel domains and the elastic hydrogel network, the resultant organohydrogels demonstrate high-strain shape-memory performance (over 1000%) which could help achieve full recovery in seconds. Consequently, GOHs are endowed with the potential of practical application in soft robots, wearable devices, and biol. materials.

Langmuir published new progress about Compression. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Recommanded Product: Dodecyl 2-methylacrylate.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Lebanov, Leo published the artcileComprehensive characterization of ylang-ylang essential oils according to distillation time, origin, and chemical composition using a multivariate approach applied to average mass spectra and segmented average mass spectral data, SDS of cas: 140-11-4, the main research area is ylang essential oil composition mass spectra data multivariate; Average mass spectrum; Gas chromatography mass spectrometry; Multivariate statistical analysis; Quality control; Ylang-ylang essential oil.

Analyses of the complex essential oil samples using gas chromatog. hyphenated with mass spectrometry (GC-MS) generate large three-way data arrays. Processing such large data sets and extracting meaningful information in the metabolic studies of natural products requires application of multivariate statistical techniques (MSTs). From the GC-MS raw data several different input data sets for the MSTs can be created, including total chromatogram average mass spectra (TCAMS), segmented average mass spectra (SAMS) and chem. composition Herein, we compared the performance of MSTs on average mass spectrum based data sets, TCAMS and SAMS, against chem. composition and attenuated total reflectance – Fourier transformation IR (ATR-FTIR) spectroscopy in the evaluation of quality of ylang-ylang essential oils, based on their grade, geog. origin and chem. composition, using principal component anal. (PCA), partial least squares regression (PLS) and discriminatory anal. (PLS-DA). PCA based on TCAMS, SAMS and chem. composition showed clear trends amongst the samples based on increase in grade (distillation time). PLS-DA applied to TCAMS, SAMS and ATR-FTIR discriminated between all geog. origins. Predicted relative abundances of the 18 most important compounds, using PLS regression models on TCAMS, SAMS and ATR-FTIR, were successfully applied to ylang-ylang essential oil quality assessment based on comparison with the ISO 3063:2004 standard, where the SAMS data set showed superior performance, compared to other data sets.

Journal of Chromatography A published new progress about Composition. 140-11-4 belongs to class esters-buliding-blocks, name is Benzyl acetate, and the molecular formula is C9H10O2, SDS of cas: 140-11-4.

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics