Tag: M.W=150-200

Day, Daniel M. published the artcileAn experimental investigation into the kinetics and mechanism of the aza-Michael additions of dimethyl itaconate, Recommanded Product: Dimethyl itaconate, the publication is Tetrahedron (2022), 132921, database is CAplus.

The aza-Michael addition is a versatile reaction for the modification of α,β-unsaturated carbonyl compounds with amines. The reactivity of di-Me itaconate as a bio-based Michael acceptor is explored in this work. Through its reactions with piperidine and dibutylamine, it was found that the order of reaction can be changed by the choice of catalyst, solvent, or the concentration of the amine reactant. The effectiveness of catalysts was proportional to their Lewis acidity. Competitive isomerisation of di-Me itaconate into unreactive regioisomers can be suppressed using low-polarity solvents and lower temperatures This investigation of the aza-Michael additions of di-Me itaconate has clarified the possible reaction mechanisms and optimized the protocol, supporting further use of this reaction in small mol. synthesis and modification of polymers.

Tetrahedron 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

Brokl, Michal published the artcileImprovement of ylang-ylang essential oil characterization by GC × GC-TOFMS, Product Details of C12H14O2, the publication is Molecules (2013), 1783-1797, database is CAplus and MEDLINE.

A single fraction of essential oil can often contain hundreds of compounds Despite of the tech. improvements and the enhanced selectivity currently offered by the state-of-the-art gas chromatog. (GC) and mass spectrometry (MS) instruments, the complexity of essential oils is frequently underestimated. Comprehensive two-dimensional GC coupled to time-of-flight MS (GC × GC-TOFMS) was used to improve the chem. characterization of ylang-ylang essential oil fractions recently reported in a previous one-dimensional (1D) GC study. Based on both, the enhanced chromatog. separation and the mass spectral deconvolution, 161 individual compounds were identified and labeled as potentially characteristic analytes found in both low and high boiling fractions issued from distillation of mature ylang-ylang flowers. Compared to the most recent full GC-MS characterization, this represents 75 new compounds, essentially consisting of terpenes, terpenoid esters, and alcs.

Molecules 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, Product Details of C12H14O2.

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

Joshi, Sumedh published the artcileMenaquinone Biosynthesis: New Strategies to Trap Radical Intermediates in the MqnE-Catalyzed Reaction, HPLC of Formula: 1877-71-0, the publication is Biochemistry (2021), 60(21), 1642-1646, database is CAplus and MEDLINE.

Aminofutalosine synthase (MqnE) is a radical SAM enzyme that catalyzes the conversion of 3-((1-carboxyvinyl)oxy)benzoic acid to aminofutalosine during the futalosine-dependent menaquinone biosynthesis. In this Communication, the authors report the trapping of a radical intermediate in the MqnE-catalyzed reaction using sodium dithionite, mol. oxygen, or 5,5-dimethyl-1-pyrroline-N-oxide. These radical trapping strategies are potentially of general utility in the study of other radical SAM enzymes.

Biochemistry 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 C9H8O4, HPLC of Formula: 1877-71-0.

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

Joshi, Sumedh published the artcileAntibacterial Strategy against H. pylori: Inhibition of the Radical SAM Enzyme MqnE in Menaquinone Biosynthesis, Category: esters-buliding-blocks, the publication is ACS Medicinal Chemistry Letters (2019), 10(3), 363-366, database is CAplus and MEDLINE.

Aminofutalosine synthase (MqnE) catalyzes an important rearrangement reaction in menaquinone biosynthesis by the futalosine pathway. We report the identification of previously unreported inhibitors of MqnE using a mechanism-guided approach. The best inhibitor shows efficient inhibitory activity against Helicobacter pylori (IC₅₀ = 1.8 ± 0.4 μM) and identifies MqnE as a promising target for antibiotic development.

ACS Medicinal Chemistry Letters 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 C9H8O4, Category: esters-buliding-blocks.

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

Li, Guoping published the artcileNon-fullerene acceptors with direct and indirect hexa-fluorination afford >17% efficiency in polymer solar cells, Category: esters-buliding-blocks, the publication is Energy & Environmental Science (2022), 15(2), 645-659, database is CAplus.

The rational mol. design of non-fullerene acceptors (NFAs) in organic solar cells (OSCs) can profoundly influence the photovoltaic (OPV) performance. To date, NFA fluorination has proven beneficial to cell performance. However, there is a lack of comprehensive understanding of how various fluorination modalities influence film morphol., carrier mobility, mol. packing, other structural properties, electronic structure, exciton separation, and charge transport, that determine ultimate cell efficiency. Here, we compare two types of end group (EG) fluorination patterns on Y6-based A-DAD-A cores, resulting in highly efficient NFAs: direct skeletal fluorination (BTF) and indirect trifluoromethyl fluorination (BTFM). These two patterns induce distinctive behaviors in the active layer blends with a chlorinated donor polymer D18-Cl and the additive, 1-chloronaphthalene, affording high PCE values of 17.30% (BTF + additive) and 17.10% (BTFM, no-additive). The BTFvs. BTFM OSC performance trends can be correlated with diffraction-derived differences in mol. packing. D. functional theory (DFT) reveals remarkably low internal reorganization energies and high electronic coupling between NFA dimers, greater and more numerous than in other NFAs reported to date, thus providing extended 3D charge transport networks in the thin film crystalline domains. Transient absorption spectroscopy reveals that hole transfer from the acceptor to the donor occurs in <300 fs and that photoexcited carriers persist for hundreds of ns in each blend film. The contrasting role of the additive in BTF and BTFM cells is further clarified by recombination dynamics anal. using in situ photocurrent and impedance spectroscopy. Overall, this work provides guidance for developing new NFAs via direct and indirect fluorination strategies for high efficiency OSCs.

Energy & Environmental Science 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, Category: esters-buliding-blocks.

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

Parker, Seth J. published the artcileSpontaneous hydrolysis and spurious metabolic properties of α-ketoglutarate esters, Recommanded Product: Dimethyl itaconate, the publication is Nature Communications (2021), 12(1), 4905, database is CAplus and MEDLINE.

α-ketoglutarate (KG), also referred to as 2-oxoglutarate, is a key intermediate of cellular metabolism with pleiotropic functions. Cell-permeable esterified analogs are widely used to study how KG fuels bioenergetic and amino acid metabolism and DNA, RNA, and protein hydroxylation reactions, as cellular membranes are thought to be impermeable to KG. Here we show that esterified KG analogs rapidly hydrolyze in aqueous media, yielding KG that, in contrast to prevailing assumptions, imports into many cell lines. Esterified KG analogs exhibit spurious KG-independent effects on cellular metabolism, including extracellular acidification, arising from rapid hydrolysis and de-protonation of α-ketoesters, and significant analog-specific inhibitory effects on glycolysis or mitochondrial respiration. We observe that imported KG decarboxylates to succinate in the cytosol and contributes minimally to mitochondrial metabolism in many cell lines cultured in normal conditions. These findings demonstrate that nuclear and cytosolic KG-dependent reactions may derive KG from functionally distinct subcellular pools and sources.

Nature Communications 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

Gencoglu, Turkan published the artcilePhotoinitiating systems based on poly(ethylene imine) for Michael addition and free radical photopolymerization, Application of Ethyl 4-dimethylaminobenzoate, the publication is Journal of Photochemistry and Photobiology, A: Chemistry (2021), 112959, database is CAplus.

Multifunctional polymeric photoinitiators with the ability of aza-Michael addition with acrylates, free radical polymerization of (meth)acrylates through type II photoinitiation and charge transfer complex (CTC) formation with iodonium salt (Iod) were prepared They were synthesized via aza-Michael addition reaction between branched poly(ethylene imine) (PEI, M_n =1800 g/mol), 2-acryloyloxy thioxanthone and tetra-Et vinylidene bisphosphonate or di-Et vinylphosphonate. Their structures were confirmed by ¹H NMR and FTIR spectroscopy. CTC formation between Iod (acceptor) and amines on PEI (donor) was confirmed by absorption shift to 440 nm in spectral anal. Photopolymerization kinetics were monitored by real time FTIR upon visible light exposure using LED @405 nm, whereas Michael addition reactivities of the photoinitiators were monitored without irradiation Excellent polymerization initiating performances were found and high final conversions were obtained. Results show that the CTCs formed at high concentrations of low-functionalized PEI allow polymerizations without light and increase polymerization efficiencies of Type II photoinitiation.

Journal of Photochemistry and Photobiology, A: 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, Application of Ethyl 4-dimethylaminobenzoate.

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

Gencoglu, Turkan published the artcileA Water Soluble, Low Migration, and Visible Light Photoinitiator by Thioxanthone-Functionalization of Poly(ethylene glycol)-Containing Poly(β-amino ester), Computed Properties of 10287-53-3, the publication is Macromolecular Chemistry and Physics (2022), 223(13), 2100450, database is CAplus.

A novel photoinitiator (PI) is described here for low ecol. impact, p(PEGDA575-TX): It is water soluble, polymerizable, thioxanthone (TX) functional, and is a one-component poly(ethylene glycol)-based poly(β-amino ester). The PI is synthesized in one step via classical aza-Michael addition reaction between poly(ethylene glycol) diacrylate (Mn = 575 D) and amine functionalized TX (2-(2-aminoethoxy)-9H-thioxanthen-9-one). It absorbs at ≈ 404 nm (ε = 14 000-44 309) in water and can photodecompose with or without additives such as Et 4-(dimethylamino)benzoate (EDB) and bis-(4-tert-butylphenyl)-iodonium hexafluorophosphate (Iod). Although it is an effective one-component visible light PI for free radical polymerization of di- and tri(meth)acrylates, EDB or Iod will be favorable for synergistic effect. p(PEGDA575-TX) has higher initiating reactivity, reducing ability of oxygen inhibition and migration stability compared to TX, which make it environmental friendly.

Macromolecular Chemistry and Physics 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, Computed Properties of 10287-53-3.

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

Hansen, Stinne W. published the artcileIdentification of a New Class of Selective Excitatory Amino Acid Transporter Subtype 1 (EAAT1) Inhibitors Followed by a Structure-Activity Relationship Study, Application of Methyl 2-(3-formyl-4-hydroxyphenyl)acetate, the publication is Journal of Medicinal Chemistry (2016), 59(19), 8757-8770, database is CAplus and MEDLINE.

Screening of a small compound library at three excitatory amino acid transporter subtypes 1-3 (EAAT1-3) subtypes resulted in the identification of compound (I) that exhibited a distinct preference as an inhibitor at EAAT1 (IC₅₀ 20 μM) compared to EAAT2 and EAAT3 (IC₅₀ > 300 μM). This prompted us to subject I to an elaborate structure-activity-relationship study through the purchase and synthesis and subsequent pharmacol. characterization of a total of 36 analogs. Although this effort did not result in analogs with substantially improved inhibitory potencies at EAAT1 compared to that displayed by the hit, it provided a detailed insight into structural requirements for EAAT1 activity of this scaffold. The discovery of this new class of EAAT1-selective inhibitors not only supplements the currently available pharmacol. tools in the EAAT field, but also substantiates the notion that EAAT ligands not derived from α-amino acids hold considerable potential in terms of subtype-selective modulation.

Journal of Medicinal Chemistry published new progress about 61874-04-2. 61874-04-2 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester,Aldehyde, name is Methyl 2-(3-formyl-4-hydroxyphenyl)acetate, and the molecular formula is C10H10O4, Application of Methyl 2-(3-formyl-4-hydroxyphenyl)acetate.

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

El Hassani, Fatima Zahra published the artcileEffect of Olive Mill Wastewater on the composition of the essential oil of bergamot-mint under semi-arid climate, Application In Synthesis of 103-26-4, the publication is Industrial Crops and Products (2022), 114487, database is CAplus.

In this work, we investigate the changes in Mentha aquatica var. citrata (bergamot-mint) characteristics and essential oil composition regarding the modification of the amended dose of Olive Mill Wastewater (OMW) in pots at three different doses; D₁ = 9 mL/100 g, D₂ = 22.5 mL/100 g and D₃ = 54 mL/100 g of soil, seven months before plantation of bergamot-mint cuttings. OMW application didn′t affect plant biomass production (leaves, stems, roots) and chlorophylls in the leaf, while the amount of leaf phenols showed a dose dependent increase. Bergamot-mint essential oil major compound is linalool acetate for control, trans-pulegol when OMW is applied at 9 mL/100 g, isopulegyl acetate when OMW is applied at 22.5 mL/100 g, and verbenone when OMW is applied at 54 mL/100 g. When OMW was applied to soil at doses D₁, D₂ and D₃, some of bergamot-mint essential oil compounds such as decanone, citronellol, piperitone epoxide, guaiacol acetate, Me cinnamate and citronellyl propanoate, totally disappeared. OMW spreading at 9 mL/100 g allowed appearance of menthone in Mentha aquatica var. citrata essential oil while menthol and terpineol appeared only when OMW was applied at the high dose 54 mL/100 g.

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 C10H10O2, Application In Synthesis of 103-26-4.

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