Month: November 2022

Cheng, Huan published the artcileComparison and evaluation of aroma-active compounds for different squeezed Chinese bayberry (Myrica rubra) juices, Recommanded Product: Methyl 3-phenyl-2-propenoate, the publication is Journal of Food Processing and Preservation (2021), 45(11), e15924, database is CAplus.

Chinese bayberry is one of the most valuable fruits with unique flavor in China. Juice aroma can be affected by processing methods, especially squeezing. The present study aimed to differentiate the aroma profiles of bayberry juices under 4 squeezing conditions (freshly/frozenly squeezed at room temperature/4°C). A total of 66 volatiles and 25 active aroma were identified as “green,” “floral,” “fruity” and “woody” odor. The contents of volatiles, including aldehydes, alcs., and esters in the freshly squeezed groups were significantly higher than frozenly squeezed groups. It was found juices squeezed at room temperature had “fermented” flavor. The total content of volatiles in frozenly squeezed at room temperature was the lowest, especially β-caryophyllene and humulene. By using GC-MS-O combined with principal component anal., the bayberry juice freshly squeezed at 4°C was of the best flavor quality, which would be used as optimal condition for squeezing process of bayberry fruits. Novelty impact statement : This work further investigates the effect of 4 different squeezing conditions on volatile aroma compounds of bayberry juice. According to the results of GC-MS-O combined with principal component anal., the contents of volatiles, including aldehydes, alcs., and esters in the freshly squeezed groups, were significantly higher than frozenly squeezed groups, and the bayberry juice obtained by squeezing fresh fruit at 4°C had the best aroma quality.

Journal of Food Processing and Preservation 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, Recommanded Product: Methyl 3-phenyl-2-propenoate.

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

Tang, Xinde published the artcilePhoto- and thermo-dual-responsive organic/inorganic hybrid materials, Application of 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, the publication is Key Engineering Materials (2013), 181-184, 5 pp., database is CAplus.

Organic/inorganic hybrid materials based upon stimuli-responsive copolymers have attracted an increasing attention. Compared with the polymeric materials, these hybrid materials can form aggregates in aqueous solution with much more stable shape-persistence due to the inorganic structure, which facilitate the mass delivery and long-term life. A novel hybrid material based on a new reactive block copolymer, poly(ethylene oxide)-block-poly{3-(trimethoxysilyl)propyl methacrylate-co-N-isopropylacrylamide-co-6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate} [PEO-P(TMSPMA-NIPAM-AzoMA)] was synthesized via atom transfer radical polymerization (ATRP). The vesicles were obtained by self-assembly of the resulting block copolymer in a selective solvent, and then the PTMSPMA block was subjected to hydrolysis and polycondensation reaction to fix vesicle wall in the presence of triethylamine as a catalyst. The photo- and thermo-dual-responsive properties of the vesicles were investigated.

Key Engineering Materials 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 C9H6FNO2, Application of 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate.

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

Zhang, Ji-Shu published the artcilePalladium-Catalyzed Direct Decarbonylative Phosphorylation of Benzoic Acids with P(O)-H Compounds, Category: esters-buliding-blocks, the publication is European Journal of Organic Chemistry (2020), 2020(9), 1148-1153, database is CAplus.

A direct decarbonylative phosphorylation of benzoic acids catalyzed by palladium was disclosed. Under the reaction conditions, a wide range of benzoic acids coupled readily with all the three kinds of P(O)-H compounds, i.e. secondary phosphine oxides, H-phosphinates and H-phosphonates, producing the corresponding organophosphorus compounds in good to high yields. This reaction could be conducted at a gram scale and applied in the late-stage phosphorylative modification of carboxylic acids drug mols. These results well demonstrated the potential synthetic value of this new reaction in organic synthesis.

European Journal of Organic Chemistry published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C9H21NO3, Category: esters-buliding-blocks.

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

Ye, Chen-Xi published the artcileAtroposelective Synthesis of Axially Chiral N-Arylpyrroles by Chiral-at-Rhodium Catalysis, Computed Properties of 30414-53-0, the publication is Angewandte Chemie, International Edition (2020), 59(32), 13552-13556, database is CAplus and MEDLINE.

A transformation of fluxional into configurationally stable axially chiral N-arylpyrroles was achieved with a highly atroposelective electrophilic aromatic substitution catalyzed by a chiral-at-metal rhodium Lewis acid. Specifically, N-arylpyrroles were alkylated with N-acryloyl-1H-pyrazole electrophiles in up to 93% yield and with up to >99.5% ee, and follow-up conversions reveal the synthetic utility of this new method [e.g., I + N-acryloyl-1H-pyrazole �II (up to 93% yield, 92% isolated, 99% ee)]. DFT calculations elucidate the origins of the observed excellent atroposelectivity.

Angewandte Chemie, International Edition published new progress about 30414-53-0. 30414-53-0 belongs to esters-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Ketone,Ester, name is Methyl 3-oxovalerate, and the molecular formula is C6H8O6, Computed Properties of 30414-53-0.

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

Zhang, Lili published the artcilePhotoredox/nickel-catalyzed hydroacylation of ethylene with aromatic acids, SDS of cas: 1877-71-0, the publication is Chemical Communications (Cambridge, United Kingdom) (2021), 57(72), 9064-9067, database is CAplus and MEDLINE.

A general, practical and scalable hydroacylation reaction of ethylene with aromatic carboxylic acids with the synergistic combination of nickel and photoredox catalysis was reported. Under ambient temperature and pressure, feedstock chems. such as ethylene could be converted into high-value-added aromatic ketones in moderate to good yields (up to 92%) with reaction time of 2-6 h.

Chemical Communications (Cambridge, United Kingdom) published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C3H5BN2O2, SDS of cas: 1877-71-0.

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

Sinsheimer, J. E. published the artcileThe genotoxicity of enantiomeric aliphatic epoxides, Recommanded Product: (R)-Oxiran-2-ylmethyl 3-nitrobenzenesulfonate, the publication is Mutation Research, Genetic Toxicology Testing (1993), 298(3), 197-206, database is CAplus and MEDLINE.

The (R)- and (S)-optical isomers of 9 epoxides, benzyloxymethyloxirane, epichlorohydrin, glycidol, glycidyl 3-nitrobenzenesulfonate, glycidyl 4-nitrobenzoate, glycidyl tosylate, styrene oxide, glycidyl 1-naphthyl ether, and glycidyl 4-nitrophenyl ether, were compared for their in vivo and in vitro genotoxicity. Differences in mutagenicity between isomers were established with Salmonella TA100 for all the compounds While 13 of the isomers were genotoxic compared to a neg. control by chromosomal aberration measurements, only in the case of glycidyl 4-nitrobenzoate could a significant difference be found between isomers by this test. However, with sister chromatid exchange evaluations, differences were detected between the (R)- and (S)-isomers for all the pairs of compounds with the exception of those for benzyloxymethyloxirane and glycidyl 4-nitrophenyl ether. At least in part, differences in the patterns of genotoxicity among compounds can be related to their differences in reaction pathways.

Mutation Research, Genetic Toxicology Testing published new progress about 115314-17-5. 115314-17-5 belongs to esters-buliding-blocks, auxiliary class Epoxides,Chiral,Nitro Compound,Sulfonate,Benzene, name is (R)-Oxiran-2-ylmethyl 3-nitrobenzenesulfonate, and the molecular formula is C20H28B2O4S2, Recommanded Product: (R)-Oxiran-2-ylmethyl 3-nitrobenzenesulfonate.

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

Barton, Lisa M. published the artcileElectrochemical borylation of carboxylic acids, COA of Formula: C14H28BNO4, the publication is Proceedings of the National Academy of Sciences of the United States of America (2021), 118(34), e2109408118, database is CAplus and MEDLINE.

A simple electrochem. mediated method for the conversion of alkyl carboxylic acids to their borylated congeners is presented. This protocol features an undivided cell setup with inexpensive carbon-based electrodes and exhibits a broad substrate scope and scalability in both flow and batch reactors. The use of this method in challenging contexts is exemplified with a modular formal synthesis of jawsamycin, a natural product harboring five cyclopropane rings.

Proceedings of the National Academy of Sciences of the United States of America published new progress about 1850305-80-4. 1850305-80-4 belongs to esters-buliding-blocks, auxiliary class Boronic acid and ester,Boronic Acids,Boronate Esters, name is tert-Butyl N-[3-(tetramethyl-1,3,2-dioxaborolan-2-yl)propyl]carbamate, and the molecular formula is C14H28BNO4, COA of Formula: C14H28BNO4.

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

Li, Jingyi published the artcilePhotoguided Shape Deformation of Azobenzene-Containing Polymer Microparticles, Name: 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, the publication is Langmuir (2015), 31(48), 13094-13100, database is CAplus and MEDLINE.

Here we present the generation of uniform microparticles with tunable diameters from azobenzene-based homopolymer by combining the microfluidics technique and emulsion-solvent evaporation route. In addition, the photoinduced deformation behavior of these microspheres, irradiated by a linearly polarized beam with different irradiation time and direction, are systemically studied. The deformation process through real time optical microscope observation can be studied, benefiting from the uniform and microscaled size of the polymer particles. The deformation degree characterized by relative variation of the long axial for the particles can be controlled by the irradiation time. Moreover, elongated particles with tunable aspect ratio or tilted shape can be generated by manipulating the irradiation direction and/or time. Interestingly, the shape transformation kinetics displays a significant dependence on initial size of the polymer particle. In addition, the shape transformation of the polymer particle can lead to the variation of the orientation and distribution of the encapsulated anisotropic gold nanorods.

Langmuir 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 C23H28N2O4, Name: 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate.

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

Shi, Min published the artcileChiral Phosphine Lewis Bases Catalyzed Asymmetric aza-Baylis-Hillman Reaction of N-Sulfonated Imines with Activated Olefins, Application of (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), the publication is Journal of the American Chemical Society (2005), 127(11), 3790-3800, database is CAplus and MEDLINE.

In the aza-Baylis-Hillman reaction of N-sulfonated imines (N-arylmethylidene-4-methylbenzenesulfonamides and others) with Me vinyl ketone, Et vinyl ketone, and acrolein, we found that, in the presence of a catalytic amount of chiral phosphine Lewis base such as (R)-2′-diphenylphosphanyl-[1,1′]binaphthalenyl-2-ol LB1 (10 mol %) and mol. sieve 4A, the corresponding aza-Baylis-Hillman adducts could be obtained in good yields with good to high ee (70-95% ee) at low temperature (âˆ?30 to -20 °C) or at room temperature in THF, resp. In CH₂Cl₂ upon heating at 40 °C, the aza-Baylis-Hillman reaction of N-sulfonated imines with Ph acrylate or naphthyl acrylate gave the adducts in good to high yields (60-97%) with moderate ee (52-77%). The mechanistic insight has been investigated by ³¹P and ¹H NMR spectroscopic measurements. The key enolate intermediate, which has been stabilized by intramol. hydrogen bonding, has been observed by ³¹P and ¹H NMR spectroscopy. An effective bifunctional Lewis base and Bronsted acid phosphine Lewis base system has been disclosed in this catalytic, asym. aza-Baylis-Hillman reaction.

Journal of the American Chemical Society 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 C5H6BNO2, Application of (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate).

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

Yu, Liguo published the artcileImpregnation modeling and preparation optimization of continuous glass fiber reinforced polylactic acid filament for 3D printing, Recommanded Product: Tris(2,4-di-tert-butylphenyl) phosphite, the publication is Polymer Composites (2021), 42(11), 5731-5742, database is CAplus.

Continuous glass fiber reinforced polylactic acid (CGF/PLA) composites were prepared by 3D printing technol. in this study. The multi-roll melt impregnation mold was manufactured according to the melt impregnation model. CGF/PLA filament was prepared by a melt impregnation device, and then used to prepare CGF/PLA composite materials by the self-modified 3D printer device. The full impregnation of the fibers was achieved by the action of the coverage angle of the tension roller in the impregnation mold. The effects of the total coverage angle, traction speed, fiber content, and impregnation temperature on the fiber impregnation effect and 3D printed product performance were studied. The bending strength, tensile strength, impact strength, and interlayer shear strength of the printed sample reached 312, 220, 154, and 14 MPa, resp. The strategy in this study can effectively improve the impregnation effect of PLA resin on CGFs and promote the development and application of 3D printing technol. in the field of high-performance composite manufacturing

Polymer Composites 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 C6H20Cl2N4, Recommanded Product: Tris(2,4-di-tert-butylphenyl) phosphite.

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