Esters-buliding-blocks

Rosenau, Thomas published the artcileOn the role of N-methylmorpholine-N-oxide (NMMO) in the generation of elemental transition metal precipitates in cellulosic materials, Recommanded Product: Propyl 3,4,5-trihydroxybenzoate, the publication is Cellulose (Dordrecht, Netherlands) (2021), 28(16), 10143-10161, database is CAplus.

Several literature reports describe the role of aqueous solutions of N-methylmorpholine-N-oxide monohydrate (NMMO) as a suitable medium for the generation of transition metal (nano)particles in or on cellulosic materials and further elaborate its role as a co-reactant of the transition metal salts that are reduced to the elemental metal. However, this would assign NMMO the role of a reductant, which is in contradiction of its obvious oxidative nature. In the present study, the exemplary cases of silver, gold, and platinum salts as the precursors of the resp. metal (nano)particles in aqueous NMMO/cellulose mixtures were investigated. Naturally, NMMO did not act as a reducing agent in any case-this role was taken over by the frequently used NMMO stabilizer Pr gallate, or by cellulose itself, into which carbonyl and carboxyl groups were introduced. Also, hypochlorite-produced intermediately from chloride ions and subsequently undergoing disproportionation into chloride and chlorate-or transient N-methylene(morpholinium) ions generated from NMMO, which are in turn oxidized to formyl morpholide, can act as the corresponding reductants while the metal ions are reduced, depending on the reaction conditions. Apart from providing interesting mechanistic insights, the study points to the importance of a precise description of the composition of the chem. systems used, as well as the importance of seemingly inert auxiliaries, which turned out to be essential co-reactants in the metal (nano)particle generation.

Cellulose (Dordrecht, Netherlands) 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

Lo Turco, Vincenzo published the artcilePlasticizers and BPA in spices and aromatic herbs of Mediterranean areas, COA of Formula: C8H14O4, the publication is Natural Product Research (2020), 34(1), 87-92, database is CAplus and MEDLINE.

This research is carried out in order to characterize the actual contamination by two ubiquitous environmental pollutants, plasticizers and Bisphenol A, in spices (black pepper, caraway and coriander) and aromatic herbs (fennel, laurel, mint, oregano, rosemary, thyme and verbena) from Algeria (n = 26), Tunisia (n = 65) and Italy (n = 53). Algerian samples seem to contain fewer residues than Italian and Tunisian samples. Among the Italian samples, only aromatic herbs, precisely mint, oregano, and laurel, were contaminated. In general, all Tunisian samples showed five plasticizers residues: the caraway, among the spices, and the rosemary, among the aromatic herbs, are found to contain more residues. Also, dietary intake of these contaminants by spices and aromatic herbs under anal. seems not to constitute a risk to the consumers.

Natural Product Research published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, COA of Formula: C8H14O4.

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

Fehrentz, Jean-Alain published the artcileSynthesis of chiral N-protected α-amino aldehydes by reduction of N-protected N-carboxyanhydrides (UNCAs), Name: (R)-tert-Butyl (3-methyl-1-oxobutan-2-yl)carbamate, the publication is Tetrahedron Letters (1994), 35(48), 9031-4, database is CAplus.

Pure N-protected (Boc, Z, Fmoc) α-amino aldehydes were obtained in high yields by reduction of N-protected N-carboxyanhydrides with equivalent amounts of LiAlH(OCMe₃)₃ or lithium tris[(3-ethyl-3-pentyl)oxy]aluminum hydride (LTEPA) in THF as solvent. The reaction is simple, rapid and proceeds without detectable racemization.

Tetrahedron Letters published new progress about 106391-88-2. 106391-88-2 belongs to esters-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Aldehyde, name is (R)-tert-Butyl (3-methyl-1-oxobutan-2-yl)carbamate, and the molecular formula is C10H19NO3, Name: (R)-tert-Butyl (3-methyl-1-oxobutan-2-yl)carbamate.

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

Morone, Marika published the artcile3-Ketoquinolones as new photoinitiators for free radical photopolymerization under LED, Recommanded Product: Ethyl 4-dimethylaminobenzoate, the publication is Polymer Chemistry (2022), 13(18), 2659-2664, database is CAplus.

A new class of photoinitiators for free radical photopolymerization based on 3-ketoquinolone chromophoric group is presented. Spectroscopic properties, quantum yield in triplet state and efficiency in formation of initiating radicals were measured. Photopolymerization experiments show that 3-ketoquinolones are effective photoinitiators for LED curing. Addnl. properties such as yellowing of cured films are also measured. These compounds appear to be interesting alternative to conventional type II photoinitiators.

Polymer Chemistry published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C11H15NO2, Recommanded Product: Ethyl 4-dimethylaminobenzoate.

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

Aubrecht, Jaroslav published the artcileDo metal-oxide promoters of Cu hydrogenolysis catalysts affect the Cu intrinsic activity?, Application of Dimethyl adipate, the publication is Applied Catalysis, A: General (2020), 117889, database is CAplus.

The well-established ester hydrogenolysis process has to be further improved to reduce its high energy demand and to replace used Adkins CuCr catalysts by chromium-free alternatives. In this study, the copper-based catalyst was modified by ZnO, ZnO with Al₂O₃ or MgO to elucidate the metal-oxide influence on catalyst structure, activity, performance and stability in ester hydrogenolysis. The catalysts composition, structure and physicochem. properties were examined by AAS, XRD, TPR, BET, N₂O-RFC, TGA-MS, NH₃-TPD and CO₂-TPD. It was confirmed that copper itself possesses high intrinsic activity for ester hydrogenolysis but the unpromoted copper species were very unstable. All used metal oxides were proven to be structural promoters stabilizing copper species and increasing the number of active sites. Consequently, they enhanced remarkably catalyst performance in di-Me adipate conversion despite the decreased intrinsic activity of Cu active sites. All prepared catalysts outperformed a com. CuCr catalyst in di-Me adipate hydrogenolysis.

Applied Catalysis, A: General published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Application of Dimethyl adipate.

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

Aubrecht, Jaroslav published the artcileUnderstanding of the key properties of supported copper-based catalysts and their influence on ester hydrogenolysis, SDS of cas: 627-93-0, the publication is Catalysis Today (2022), 173-181, database is CAplus.

The application of Cr-free Cu-based catalysts in ester hydrogenolysis is a modern environmentally-friendly research approach. The comprehensive study of four supported Cu-based catalysts was performed using 8 wt% of Cu loaded on Al₂O₃, ZnO, TiO₂ and ZrO₂ supports by an impregnation method. Using XRD, H₂-TPR, BET, pyridine-TPD, CO₂-TPD and N₂O-RFC methods, the effect of the support on the formation of Cu-nanoparticles was described. Al₂O₃ was evaluated as the support ensuring the highest nanoparticles dispersion, while Cu nanoparticles in Cu-TiO₂ were liable to sintering. The catalysts were tested in di-Me adipate hydrogenolysis, where the catalyst performance and activity (TOF) were evaluated and Cu-ZrO₂ showed the best results. A correlation between the number of acid-base sites and the catalyst selectivity was revealed and the catalyst effect on the formation of various byproducts was described. The intrinsic selectivity to hydrogenolysis products was found to decrease with the increasing acid-base character of the supports whereas the selectivity to transesterification and cyclization products increased. The hydrogenolysis activity was not a simple function of the number of the surface copper atoms, but it was affected by the support nature and its properties.

Catalysis Today published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, SDS of cas: 627-93-0.

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

Aubrecht, Jaroslav published the artcileCritical evaluation of parameters affecting Cu nanoparticles formation and their activity in dimethyl adipate hydrogenolysis, Synthetic Route of 627-93-0, the publication is Catalysis Today (2022), 61-71, database is CAplus.

Supported copper catalysts are promising alternative to replace CuCr catalysts in ester hydrogenolysis and decrease the environmental footprint of the process. However, the effect of the support properties on the Cu nanoparticles formation and, consequently, on the final hydrogenolysis performance has not been investigated in detail. Therefore, we have selected 10 supports with different textural-structural properties and impregnated them by incipient wetness impregnation to achieve 8 wt% Cu loading. Although the silica-based supports provided much larger surface area to deposit Cu compared to ZnO, MgO, or TiO₂, the final Cu dispersion was similar for these catalysts due to the insufficient electrostatic attraction. A significant improvement was observed when using ZrO₂ as a support, while the best Cu dispersion was achieved using alumina-based supports. The reduced catalysts were tested in di-Me adipate (DMA) hydrogenolysis to obtain hexane-1,6-diol (HDOL). Due to the good Cu dispersion ensured by ZrO₂ and alumina supports, they outperformed the rest of the catalysts reaching the highest DMA conversion of 36 and 22-25%, resp. Moreover, Cu-ZrO₂ reached the highest hydrogenolysis activity (TOFH) due to a good copper-zirconia interaction. The maximum HDOL selectivity of about 8% was obtained over alumina-based catalysts. The increasing number of acid-base sites was found to be responsible for decreasing HDOL selectivity. Over these sites, a large amount of transesterification byproducts (<80%) and other side products were formed. Although the larger support surface area may ensure a better Cu dispersion, the acid-base sites or electrostatic attraction during impregnation play a key role by affecting the Cu nanoparticle formation and, consequently, the final catalyst performance.

Catalysis Today published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Synthetic Route of 627-93-0.

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

Lefebvre, Quentin published the artcileOne Amine-3 Tasks: Reductive Coupling of Imines with Olefins in Batch and Flow, Recommanded Product: Dimethyl itaconate, the publication is Chemistry – A European Journal (2020), 26(6), 1363-1367, database is CAplus and MEDLINE.

An iridium-based photocatalyst promotes the direct reductive cross-coupling of imines Ar¹CH=NAr² (Ar¹ = C₆H₅, 2-CH₃OC₆H₄, 4-FC₆H₄, etc.; Ar² = C₆H₅, 4-FC₆H₄, 4-ClC₆H₄, 4-CH₃OC₆H₄) with olefins R¹R²C=CH₂ (R¹ = H, CH₃, NHC(O)CH₃, CH₂C(O)₂CH₃; R² = C(O)₂Me, S(O)₂Ph, C(O)₂(t-Bu), etc.) upon irradiation with visible light to give GABA derivatives Ar¹CH(NHAr²)CH₂CH(R¹)R² in good yields and selectivities. By enabling triple role of tributylamine additive in this process, the advantages of strategies based on proton-coupled electron transfer (PCET) and the scale-up of this reaction in continuous flow have been achieved.

Chemistry – A European Journal published new progress about 617-52-7. 617-52-7 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Aliphatic hydrocarbon chain,Ester, name is Dimethyl itaconate, and the molecular formula is C7H10O4, Recommanded Product: Dimethyl itaconate.

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

Sieroslawski, Krzysztof published the artcilePotassium p-nitrophenyl sulfate, Synthetic Route of 6217-68-1, the publication is Acta Crystallographica, Section C: Crystal Structure Communications (2004), C60(7), m327-m329, database is CAplus and MEDLINE.

Crystals of the title compound are orthorhombic, space group Pbca, with a 6.905(3), b 13.116(5), c 18.969(11) Å; Z = 8, d_c = 1.989; R = 0.036, R_w(F²) = 0.085 for 2514 reflections. The structure is built up from p-nitrophenyl sulfate anions and K cations. Adjacent anions form dimers, which are linked together in a three-dimensional network via short C-H···O contacts. The coordination sphere of the K⁺ ions may be described as a distorted square antiprism. The crystal structure is further stabilized by π-π stacking interactions between the aryl rings.

Acta Crystallographica, Section C: Crystal Structure Communications published new progress about 6217-68-1. 6217-68-1 belongs to esters-buliding-blocks, auxiliary class Salt,Nitro Compound,Sulfonate,Benzene, name is Potassium 4-nitrophenyl sulfate, and the molecular formula is C7H14N4, Synthetic Route of 6217-68-1.

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

Bielicka-Daszkiewicz, Katarzyna published the artcileExtraction of organic compounds released from dental materials, Related Products of esters-buliding-blocks, the publication is Microchemical Journal (2021), 106594, database is CAplus.

Extraction method based on polymer inclusion membranes device was used for isolation organic compounds released from dental materials. These compounds were isolated form artificial saliva solution Three different membranes were used, it based on cellulose triacetate and 2-nitrophenyloctyl ether as plasticizer. One of membranes addnl. contained Aliquat-336 as carrier of analytes. The best efficiency of polymer membranes was achieved between 80 and 100% for three components membrane. The retention properties of polymeric membranes was described and confirmed using Hansen Solubility Parameter determined for each isolated compound and membrane components. Determination of this parameter allows to describe the interaction between isolated compound and membrane, and conclude which membrane composition gives the best retention properties.

Microchemical Journal published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, Related Products of esters-buliding-blocks.

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