Tag: M.W=150-200

Wortman, Sam E. published the artcileA new method for detecting micro-fragments of biodegradable mulch films containing poly(butylene adipate-co-terephthalate) (PBAT) in soil, SDS of cas: 627-93-0, the publication is Journal of Environmental Quality (2022), 51(1), 123-128, database is CAplus and MEDLINE.

Biodegradable mulch (BDM) is a potentially sustainable alternative to polyethylene plastic mulch film for intensive crop production Certified BDMs must demonstrate >90% biodegradation in compost and agricultural soil, but the environmental fate of BDM micro-fragments is usually not measured. While using fatty acid Me ester (FAME) anal. to study changes in soil microbial communities under different BDMs and management conditions, two peaks were detected by gas chromatog. that were derived from a BDM containing poly(butylene adipate-co-terephthalate) (PBAT). The largest peak was identified as 1,4-benzenedicarboxylic acid, di-Me ester, or di-Me terephthalate (DMT). The smaller peak was hexanedioic acid di-Me ester or di-Me adipate. From this observation we hypothesized that the FAME method could be used to detect and quantify micro-fragments (<5 mm in length) of PBAT-containing BDM in soil. To test this, fragments of two com. available BDMs were added to soil and extracted for FAME analyses. Linear relationships were observed between DMT and mulch mass added to soil for both BDMs when the initial mass of fragments was <3.5 mg (r2 > .99). Based on our findings, the FAME method could be redeployed to study the environmental fate and possible accumulation of BDM micro-fragments in soil over time.

Journal of Environmental Quality 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 C8H16O2, SDS of cas: 627-93-0.

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

Liu, Chengwei published the artcileBimetallic Cooperative Catalysis for Decarbonylative Heteroarylation of Carboxylic Acids via C-O/C-H Coupling, Safety of 3-(Methoxycarbonyl)benzoic acid, the publication is Angewandte Chemie, International Edition (2021), 60(19), 10690-10699, database is CAplus and MEDLINE.

Cooperative bimetallic catalysis is a fundamental approach in modern synthetic chem. We report bimetallic cooperative catalysis for the direct decarbonylative heteroarylation of ubiquitous carboxylic acids via acyl C-O/C-H coupling [e.g., benzoxazole + benzoic acid → 2-phenylbenzoxazole (92%)]. This novel catalytic system exploits the cooperative action of a copper catalyst and a palladium catalyst in decarbonylation, which enables highly chemoselective synthesis of important heterobiaryl motifs through the coupling of carboxylic acids with heteroarenes in the absence of prefunctionalization or directing groups. This cooperative decarbonylative method uses common carboxylic acids and shows a remarkably broad substrate scope (>70 examples), including late-stage modification of pharmaceuticals and streamlined synthesis of bioactive agents. Extensive mechanistic and computational studies were conducted to gain insight into the mechanism of the reaction. The key step involves intersection of the two catalytic cycles via transmetalation of the copper-aryl species with the palladium(II) intermediate generated by oxidative addition/decarbonylation.

Angewandte Chemie, International Edition 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, Safety of 3-(Methoxycarbonyl)benzoic acid.

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

Liu, Chengwei published the artcilePalladium-Catalyzed Decarbonylative Borylation of Carboxylic Acids: Tuning Reaction Selectivity by Computation, Synthetic Route of 1877-71-0, the publication is Angewandte Chemie, International Edition (2018), 57(51), 16721-16726, database is CAplus and MEDLINE.

Decarbonylative borylation of carboxylic acids is reported. Carbon electrophiles are generated directly after reagent-enabled decarbonylation of the in situ accessible sterically-hindered acyl derivative of a carboxylic acid under catalyst controlled conditions. The scope and the potential impact of this method are demonstrated in the selective borylation of a variety of aromatics (>50 examples). This strategy was used in the late-stage derivatization of pharmaceuticals and natural products. Computations reveal the mechanistic details of the unprecedented C-O bond activation of carboxylic acids. By circumventing the challenging decarboxylation, this strategy provides a general synthetic platform to access arylpalladium species for a wide array of bond formations from abundant carboxylic acids. The study shows a powerful combination of experiment and computation to predict decarbonylation selectivity.

Angewandte Chemie, International Edition 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, Synthetic Route of 1877-71-0.

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

Liu, Chengwei published the artcileSynthesis of Biaryls via Decarbonylative Palladium-Catalyzed Suzuki-Miyaura Cross-Coupling of Carboxylic Acids, Formula: C9H8O4, the publication is iScience (2019), 749-759, database is CAplus and MEDLINE.

The present report implements a decarbonylative version with loss of carbon monoxide (CO) that enables to directly engage acids ArC(O)OH (Ar¹ = 2-[(E)-2-phenylethenyl]phenyl, naphthalen-1-yl, pyridin-3-yl, etc.)/Ar¹B(OH)₂ (Ar¹ = thiophen-3-yl, naphthalen-2-yl, 2H-1,3-benzodioxol-5-yl, etc.) in a Suzuki-Miyaura cross-coupling to produce biaryls as a general method with high cross-coupling selectivity using a well-defined Pd(0)/(II) catalytic cycle. This protocol shows a remarkably broad scope (>80 examples) and is performed in the absence of exogenous inorganic bases. In a broader context, the approach shows promise for routine applications in the synthesis of biaryls Ar-Ar¹ by carefully controlled decarbonylation of prevalent acids.

iScience 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, Formula: C9H8O4.

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

Liu, Chengwei published the artcileDecarbonylative Phosphorylation of Carboxylic Acids via Redox-Neutral Palladium Catalysis, COA of Formula: C9H8O4, the publication is Organic Letters (2019), 21(22), 9256-9261, database is CAplus and MEDLINE.

We describe the direct synthesis of organophosphorus compounds from ubiquitous aryl and vinyl carboxylic acids via decarbonylative palladium catalysis. The catalytic system shows excellent scope and tolerates a wide range of functional groups (>50 examples). The utility of this powerful methodol. is highlighted in the late-stage derivatization directly exploiting the presence of the prevalent carboxylic acid functional group. DFT studies provided insight into the origin of high bond activation selectivity and P(O)-H isomerization pathway.

Organic 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, COA of Formula: C9H8O4.

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

Zhang, Xin published the artcileReverse atom transfer radical polymerization of dimethyl itaconate initiated by new azo initiator AIBME, Name: Dimethyl itaconate, the publication is RSC Advances (2022), 12(21), 13347-13351, database is CAplus and MEDLINE.

Reverse atom transfer radical polymerization (RATRP) was used to synthesize poly(di-Me itaconate) (PDMI) using an AIBME/CuBr₂/dNbpy system. The number average mol. weight (Mn) of PDMI was as high as Mn = 15 000 g mol^-1, the monomer conversion rate reached up to 70%, and the dispersity remained low (D = 1.06-1.38). The first-order kinetics of PDMI are discussed in detail. The AIBME initiator had a higher initiation efficiency than the AIBN initiator. As the ratio of initiator (AIBME) to catalyst (CuBr₂) decreased, the Mn and D of PDMI decreased. At 60°C and 80°C, the Mn of PDMI was much higher than the theor. number average (M_n,th), and the D of PDMI broadened with the conversion rate. At 100°C, the D of PDMI remained low, and the Mn of PDMI was closer to the Mn,th. As the ratio of monomer (DMI) to initiator (AIBME) increased, the Mn of PDMI changed little over time. These phenomena could be explained by the influence of the initiator and catalyst on polymerization kinetics.

RSC Advances 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 C7H13BrSi, Name: Dimethyl itaconate.

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

Zhang, Yueteng published the artcilePhotoredox Asymmetric Nucleophilic Dearomatization of Indoles with Neutral Radicals, Recommanded Product: Ethyl 4-dimethylaminobenzoate, the publication is ACS Catalysis (2021), 11(2), 998-1007, database is CAplus.

The dearomatization of indoles represents the most efficient approach for accessing highly valued indolines. The inherent nucleophilic reactivity of indoles has dictated indole dearomatization development in both 1e- and 2e- processes. However, the dearomatization of electron-deficient indoles has been challenging. Herein, authors introduce a conceptually distinct photoredox-mediated Giese-type transformation strategy, which is generally used for the conjugate addition of radicals to simple α, β-unsaturated systems, for chemoselectively breaking C=C bonds embedded in the aromatic structure. Moreover, highly diastereoselective addition of challenging neutral radicals has been achieved by Oppolzer camphorsultam chiral auxiliary. Structurally diverse amine-functionalized chiral indolines carrying distinct functional and stereochem. diversity are produced from a wide array of amines as radical precursors. Furthermore, the mild, powerful manifold is capable of the late-stage modification of complex natural products and pharmaceuticals. DFT studies are performed to elucidate the observed stereochem. outcomes.

ACS Catalysis 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 C8H16O2, Recommanded Product: Ethyl 4-dimethylaminobenzoate.

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

Zhang, Guodong published the artcileRegioselective C-H Alkylation via Carboxylate-Directed Hydroarylation in Water, Safety of 3-(Methoxycarbonyl)benzoic acid, the publication is Chemistry – A European Journal (2018), 24(18), 4537-4541, database is CAplus and MEDLINE.

In the presence of catalytic [RuCl₂(p-cym)]₂ and using Li₃PO₄ as the base, benzoic acids react with olefins in water to afford the corresponding 2-alkylbenzoic acids in moderate to excellent yields. This C-H alkylation process is generally applicable to diversely substituted electron-rich and electron-deficient benzoic acids, along with α,β-unsaturated olefins including unprotected acrylic acid. The widely available carboxylate directing group can be removed or used for further derivatization. Mechanistic studies revealed that the transformation proceeds via a ruthenacycle intermediate.

Chemistry – A European Journal 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 C14H10O4, Safety of 3-(Methoxycarbonyl)benzoic acid.

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

Yuan, Nan published the artcileLabel-free Fluorescence Turn on Trypsin Assay Based on Gemini Surfactant/heparin/Nile Red Supramolecular Assembly, Synthetic Route of 10287-53-3, the publication is Journal of Fluorescence (2021), 31(5), 1537-1545, database is CAplus and MEDLINE.

In this research, we designed a label-free fluorometric turn-on assay for trypsin and inhibitor screening, based on a spherical cationic gemini surfactant ethylene-bis (dodecyl di-Me ammonium bromide) (EDAB)/heparin/Nile red (NR) supramol. assembly system. The introduction of gemini surfactant EDAB as template greatly enhanced its salt resistance and resulted in the supramol. assemblies with diameters ranging from 20 to 100 nm. The fluorometric assay for trypsin was performed by firstly disassembling with protamine (a heparin-binding protein) and then re-assembling through hydrolysis of protamine. The disassembly and reassembly of the system resulted in a turn-off first and then a turn-on behavior of the corresponding fluorescence. The overall processes were characterized by fluorescence spectra, TEM measurements and zeta potential tests. The detection level of this assembly system for trypsin was as low as 4.2 ng mL-1. Also, the EDAB/heparin/NR assembly could be used to screen the trypsin inhibitors. The assembly system was easily-fabricated and cost-effective, but also exhibited good salt tolerance in NaCl solution at the concentration of 0-500 mM. At last, the supramol. assembly was successfully applied to detect trypsin in human urine, demonstrating its great potential on clin. diagnosis applications.

Journal of Fluorescence 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 C17H16O2, Synthetic Route of 10287-53-3.

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

Chen, Haifeng published the artcileNickel-Catalyzed Reductive Allylation of Tertiary Alkyl Halides with Allylic Carbonates, COA of Formula: C12H14O2, the publication is Angewandte Chemie, International Edition (2017), 56(42), 13103-13106, database is CAplus and MEDLINE.

The construction of all C(sp³) quaternary centers has been successfully achieved under Ni-catalyzed cross-electrophile coupling of allylic carbonates with unactivated tertiary alkyl halides. For allylic carbonates bearing C1 or C3 substituents, the reaction affords excellent regioselectivity through the addition of alkyl groups to the unsubstituted allylic carbon terminus. The allylic alkylation method also exhibits excellent functional-group compatibility, and delivers the products with high E selectivity.

Angewandte Chemie, International Edition 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