Category: esters-buliding-blocks

Zhang, Wen published the artcileAxially chiral P,S-heterodonor ligands with a binaphthalene framework for palladium-catalyzed asymmetric allylic substitutions: experimental investigation on the reversal of enantioselectivity between different alkyl groups on sulfur atom, Recommanded Product: (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), the publication is Tetrahedron: Asymmetry (2004), 15(21), 3467-3476, database is CAplus.

The enantioselectivity in the palladium-catalyzed asym. allylic alkylation of 1,3-diphenylpropenyl acetate with di-Me malonate using axially chiral P,S-heterodonor ligands BINAPS with different alkyl groups on sulfur atom has been investigated. Their bidentate coordination patterns to a Pd metal center with both P and S atoms have been unambiguously disclosed by X-ray diffraction. The reaction mechanism and the investigation on the reversal of enantioselectivity between different alkyl groups on sulfur atom have been discussed on the basis of the X-ray crystal structure and NMR spectroscopic data.

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 C8H7ClO3, Recommanded Product: (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate).

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

Zhang, Xiao-Nan published the artcileA Highly Nucleophilic Multifunctional Chiral Phosphane-Catalyzed Asymmetric Intramolecular Rauhut-Currier Reaction, Application In Synthesis of 126613-06-7, the publication is European Journal of Organic Chemistry (2012), 2012(31), 6271-6279, database is CAplus.

An asym. variant of the intramol. Rauhut-Currier (RC) reaction can be achieved using a highly nucleophilic multifunctional chiral phosphine; the corresponding cyclopentene and cyclohexene derivatives are produced in moderate to good yields and with good to excellent enantioselectivities. E.g., in presence of the chiral phosphine I, Rauhut-Currier reaction of (E,E)-II gave 96% cyclohexene derivative III (61% ee).

European Journal of Organic Chemistry 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 C16H12O, Application In Synthesis of 126613-06-7.

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

Wang, Wenliang published the artcileCatalytic fast pyrolysis of cellulose for increasing contents of furans and aromatics in biofuel production, Name: 3-Acetyldihydrofuran-2(3H)-one, the publication is Journal of Analytical and Applied Pyrolysis (2018), 93-100, database is CAplus.

The catalytic fast pyrolysis of cellulose, cellobiose and glucose with the zeolite catalyst of NaY was carried out using thermogravimetric analyzer (TG) and pyrolysis-gas chromatog./mass spectrometry (Py-GC/MS). Results from TG showed that all samples presented significant mass loss at low temperature and exhibited high residual chars with NaY. The activation energies of cellulose, cellobiose and glucose were significantly decreased with NaY. PY-GC/MS showed that saccharides were significantly decreased or even completely eliminated and converted into furans, aromatics, phenols and light oxygenates with NaY. The contents of furans of cellulose, cellobiose and glucose with NaY were increased from 17.48%, 18.79% and 28.77% to 46.71%, 52.11% and 67.81%, resp. Pyrolysis of cellulose and cellobiose presented high selectivity of BTX (Benzene, Toluene, and Xylene). The furans are mainly formed on the surface of NaY by dehydration, fragmentation/retro-aldol condensation, decarbonylation, or decarboxylation. The pyrolysis intermediates of anhydro-oligosaccharides dominated the formation of aromatics and phenols during the catalytic fast pyrolysis of cellulose in the zeolite catalyst pores at the active sites.

Journal of Analytical and Applied Pyrolysis published new progress about 517-23-7. 517-23-7 belongs to esters-buliding-blocks, auxiliary class Tetrahydrofuran,Ketone,Ester, name is 3-Acetyldihydrofuran-2(3H)-one, and the molecular formula is C13H15NO6S, Name: 3-Acetyldihydrofuran-2(3H)-one.

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

Chen, Yukun published the artcileThe High Complexity of Plastic Additives in Hand Wipes, Recommanded Product: Propyl 3,4,5-trihydroxybenzoate, the publication is Environmental Science & Technology Letters (2021), 8(8), 639-644, database is CAplus.

Extensive and long-term applications have resulted in global distributions of plastic additives (PAs). To facilitate the understanding of human exposure to PAs, the present study investigated the abundances and profiles of a broad range of PAs on human hands via hand wipe sampling. Sixty out of 160 PAs were detected in >50% of hand wipes collected from 30 children and 45 adults, among which a number of organophosphate esters (OPEs) and synthetic antioxidants that have rarely or never been investigated in prior studies. The total masses of PAs ranged from 650 to 87 030 ng (median: 6110 ng) and 1230 to 19360 ng (median: 5600 ng) in adultsâ€?and children′s hand wipes, resp. By categories, phthalates (PAEs) represented the most abundant group of PAs, followed by non-PAE plasticizers, UV stabilizers, OPEs, antioxidants, and bisphenol analogs. Children exhibited greater PA levels per square centimeter of hand surface, indicating elevated exposure compared with adults. Strong correlations existed for many PAs between adults and children or within each subpopulation, indicating close connections between the two subpopulations in the exposure profiles. The great complexity of plastic additives on hands raises the need for future investigations on human exposure pathways and potential health risks from the “cocktail” effects.

Environmental Science & Technology Letters published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C10H12O5, Recommanded Product: Propyl 3,4,5-trihydroxybenzoate.

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

Chen, Yukun published the artcileThe High Complexity of Plastic Additives in Hand Wipes, Related Products of esters-buliding-blocks, the publication is Environmental Science & Technology Letters (2021), 8(8), 639-644, database is CAplus.

Extensive and long-term applications have resulted in global distributions of plastic additives (PAs). To facilitate the understanding of human exposure to PAs, the present study investigated the abundances and profiles of a broad range of PAs on human hands via hand wipe sampling. Sixty out of 160 PAs were detected in >50% of hand wipes collected from 30 children and 45 adults, among which a number of organophosphate esters (OPEs) and synthetic antioxidants that have rarely or never been investigated in prior studies. The total masses of PAs ranged from 650 to 87 030 ng (median: 6110 ng) and 1230 to 19360 ng (median: 5600 ng) in adultsâ€?and children′s hand wipes, resp. By categories, phthalates (PAEs) represented the most abundant group of PAs, followed by non-PAE plasticizers, UV stabilizers, OPEs, antioxidants, and bisphenol analogs. Children exhibited greater PA levels per square centimeter of hand surface, indicating elevated exposure compared with adults. Strong correlations existed for many PAs between adults and children or within each subpopulation, indicating close connections between the two subpopulations in the exposure profiles. The great complexity of plastic additives on hands raises the need for future investigations on human exposure pathways and potential health risks from the “cocktail” effects.

Environmental Science & Technology Letters 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, Related Products of esters-buliding-blocks.

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

Cho, Suk Young published the artcileSynthesis and evaluation of a new chiral ligand: 2-diphenylarsino-2′-diphenylphosphino-1,1′-binaphthyl (BINAPAs), Related Products of esters-buliding-blocks, the publication is Tetrahedron Letters (1998), 39(13), 1773-1776, database is CAplus.

Chiral 2-diphenylarsino-2′-diphenylphosphino-1,1′-binaphthyl (BINAPAs) was synthesized and is an effective ligand in an aryl triflate-using asym. Heck reaction. For example, intramol. cyclization of I to the tetrahydroanthracene derivative in the presence of BINAPAs, Pd₂(dba)₃ and K₂CO₃ occurred with 91% yield and 88% ee in toluene at 40°.

Tetrahedron Letters 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 C22H12F6O6S2, Related Products of esters-buliding-blocks.

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

Su, Timothy A. published the artcileA Modular Ionophore Platform for Liver-Directed Copper Supplementation in Cells and Animals, Name: (3aR,5R,6R,7R,7aR)-5-(Acetoxymethyl)-2-methyl-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]oxazole-6,7-diyl diacetate, the publication is Journal of the American Chemical Society (2018), 140(42), 13764-13774, database is CAplus and MEDLINE.

Copper deficiency is implicated in a variety of genetic, neurol., cardiovascular, and metabolic diseases. Current approaches for addressing copper deficiency rely on generic copper supplementation, which can potentially lead to detrimental off-target metal accumulation in unwanted tissues and subsequently trigger oxidative stress and damage cascades. Here we present a new modular platform for delivering metal ions in a tissue-specific manner and demonstrate liver-targeted copper supplementation as a proof of concept of this strategy. Specifically, we designed and synthesized an N-acetylgalactosamine-functionalized ionophore, Gal-Cu(gtsm), to serve as a copper-carrying “Trojan Horse” that targets liver-localized asialoglycoprotein receptors (ASGPRs) and releases copper only after being taken up by cells, where the reducing intracellular environment triggers copper release from the ionophore. We utilized a combination of bioluminescence imaging and inductively coupled plasma mass spectrometry assays to establish ASGPR-dependent copper accumulation with this reagent in both liver cell culture and mouse models with minimal toxicity. The modular nature of our synthetic approach presages that this platform can be expanded to deliver a broader range of metals to specific cells, tissues, and organs in a more directed manner to treat metal deficiency in disease.

Journal of the American Chemical Society published new progress about 10378-06-0. 10378-06-0 belongs to esters-buliding-blocks, auxiliary class Other Aliphatic Heterocyclic,Chiral,Ester,Inhibitor,Inhibitor, name is (3aR,5R,6R,7R,7aR)-5-(Acetoxymethyl)-2-methyl-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]oxazole-6,7-diyl diacetate, and the molecular formula is C19H24BNO2, Name: (3aR,5R,6R,7R,7aR)-5-(Acetoxymethyl)-2-methyl-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]oxazole-6,7-diyl diacetate.

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

Mori-Quiroz, Luis M. published the artcileCopper-Catalyzed Amidation of Primary and Secondary Alkyl Boronic Esters, Recommanded Product: tert-Butyl N-[3-(tetramethyl-1,3,2-dioxaborolan-2-yl)propyl]carbamate, the publication is Chemistry – A European Journal (2016), 22(44), 15654-15658, database is CAplus and MEDLINE.

The oxidative copper-catalyzed cross-coupling of functionalized alkyl boronic esters with primary amides is reported. Through the identification of appropriate diketimine ligands, conditions for efficient coupling of both primary and secondary alkyl boronic esters with diverse primary amides, including acetamide, have been developed.

Chemistry – A European Journal 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, Recommanded Product: tert-Butyl N-[3-(tetramethyl-1,3,2-dioxaborolan-2-yl)propyl]carbamate.

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

Gajare, A. S. published the artcileNatural kaolinitic clay and EPZG: efficient solid catalysts for selective regeneration of carboxylic acids from their corresponding allyl or cinnamyl esters, COA of Formula: C12H14O2, the publication is Synthetic Communications (1998), 28(1), 25-33, database is CAplus.

Natural kaolinitic clay and EPZG are efficient catalysts for selective regeneration of carboxylic acids from their corresponding allyl or cinnamyl esters. E.g., BzOCH₂CH:CMe₂ gave 100% benzoic acid.

Synthetic Communications published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C12H14O2, COA of Formula: C12H14O2.

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

El Hajj, N. published the artcileRecycling of poly(propylene)-based car bumpers as carrier resin for short glass fiber composites, Category: esters-buliding-blocks, the publication is Journal of Material Cycles and Waste Management (2021), 23(1), 288-300, database is CAplus.

The production of composite materials from post-consumer polypropylene car bumper waste (PP-CBW) and short glass fibers (SGF) by melt processing was investigated during this study. To improve the interfacial adhesion between the fibers and the matrix, two coupling agents maleic anhydride-grafted linear low-d. polyethylene (LLDPE-g-MA) and Retain were introduced during the compounding process. The effect of various SGF loadings, types of coupling agents, SGF to coupling agent ratio and short glass fiber length on thermal, phys. and mech. properties were thoroughly investigated during this study. Differential scanning calorimetry (DSC) anal. indicated significant changes in the crystallization temperature (T_c) and percentage crystallinity (X_c) when the SGF content and length were modified. The average length (Lave) was found to decrease with increasing the SGF loading. On the other hand, Lave values increased with the original glass fiber length and when a SGF/LLDPE-g-Ma ratio of 5:1 was used compared to the ratio 3:1. The incorporation of SGF improved drastically the flexural and the tensile properties but decreased the impact properties. The impact properties improved when a ratio of SGF/LLDPE-g-MA of 3:1 was used. Mech. results showed also that the LLDPE-g-MA is a better compatibilizer than Retain for stiffness and strength, whereas Retain composites resulted in higher impact properties than LLDPE-g-MA composites. The SEM results revealed that SGFs are evenly distributed in PP-CBW matrixes.

Journal of Material Cycles and Waste Management 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, Category: esters-buliding-blocks.

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