Category: esters-buliding-blocks

Gulyas, Henrik published the artcileHighly active, chemo- and enantioselective Pt-SPO catalytic systems for the synthesis of aromatic carboxamides, Related Products of esters-buliding-blocks, the publication is Catalysis Science & Technology (2015), 5(7), 3822-3828, database is CAplus.

Platinum complexes modified with a chiral non-racemizing SPO pre-ligand have been applied in the hydration of aromatic nitriles. [Pt(1)₃Cl]Cl formed readily from Pt(COD)Cl₂. A chiral secondary phosphine oxide complex showed moderate activity in the hydration of para- and meta-substituted benzonitriles, but failed in converting the ortho-substituted derivatives The hydride complex PtH(PR₂OH)(PR₂O-H···OR₂P) (PR₂OH = 1) formed from Pt(PPh₃)₄ and 1, and the cationic complex derived from [Pt(1)₃Cl]Cl by a direct chloride abstraction with AgNO₃ were proven to be considerably more active, allowing us to extend the scope to the hydration of ortho-substituted aromatic nitriles, including axially chiral [1,1′-binaphthalene]-2,2′-dicarbonitrile. In the hydration of a racemic dinitrile, successful kinetic resolution has been achieved. The catalysts derived from a non-racemizing ligand are the first chiral transition metal-SPO complexes that provide kinetic resolution in the hydration of a racemic chiral nitrile. The synthesis of the target compounds was achieved using (11bR)-4,5-dihydro-3H-Dinaphtho[2,1-c:1′,2′-e]phosphepin 4-oxide as a chiral ligand and dichloro[(1,2,5,6-η)-1,5-cyclooctadiene]platinum or tetrakis(triphenylphosphine)platinum as catalyst. Starting materials included benzonitrile derivatives, naphthalenecarbonitrile, benzeneacetonitrile., [1,1′-binaphthalene]-2,2′-dicarbonitrile.

Catalysis Science & Technology 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

Mayadunne, Roshan T. A. published the artcileLiving Radical Polymerization with Reversible Addition-Fragmentation Chain Transfer (RAFT Polymerization) Using Dithiocarbamates as Chain Transfer Agents, Product Details of C12H17NS2, the publication is Macromolecules (1999), 32(21), 6977-6980, database is CAplus.

Living radical polymerization with reversible addition-fragmentation chain transfer (RAFT polymerization) can be achieved with the use of dithiocarbamate derivatives that have the nonbonded electron pair of the nitrogen included as part of an aromatic system. These compounds have been shown to be highly effective in RAFT polymerization of styrene and (meth)acrylate esters to produce polymers of predetermined mol. weight and narrow polydispersity (usually <1.2). By contrast, simple N,N-dialkyl dithiocarbamates (those compounds previously described as “photoiniferters”) are ineffective as RAFT agents. The reasons for the different behavior are discussed.

Macromolecules published new progress about 3052-61-7. 3052-61-7 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Amide, name is Benzyl diethylcarbamodithioate, and the molecular formula is C12H17NS2, Product Details of C12H17NS2.

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

Wood, Callum H published the artcileIncidence of persistent lymphopenia in people with multiple sclerosis on dimethyl fumarate., Product Details of C6H8O4, the publication is Multiple sclerosis and related disorders (2022), 103492, database is MEDLINE.

BACKGROUND: Dimethyl fumarate (DMF) is a disease modifying therapy (DMT) used in the management of Multiple Sclerosis (MS). Lymphopenia occurs in approximately 30% of people receiving this medication. The recently revised Summary of Product Characteristics (SPC) recommends increased monitoring or cessation of this medication in the context of persistent lymphopenia, because of an increased risk of progressive multifocal leukoencephalopathy (PML). It is therefore important for clinicians and patients to be aware of the frequency of persistent, moderate-severe lymphopenia in order to make informed decisions regarding drug choice and safety monitoring. METHODS: We reviewed medical records of 156 people with MS (PwMS) started on DMF between 2014 and 2020, who received at least 6 months of treatment, in order to identify the incidence and duration of persistent lymphopenia. RESULT: Ten were excluded due to missing data. In 146 patients, treated for 30.7 months (mean), 16 (11%) were found to experience persistent moderate lymphopenia (0.5-0.7 × 10⁹/L) and 5 (3%) experienced persistent severe lymphopenia (<0.5 × 10⁹/L). Of the 5 patients with persistent severe lymphopenia, 3 discontinued DMF. Two cases stopped directly due to SPC recommendations and after 6-months no further DMTs were initiated. Treatment was withdrawn in a further case due to lack of efficacy. Two cases remained on DMF as their persistent severe lymphopenia predated SPC revision. Mean times to persistent moderate and severe lymphopenia were 10.6 months and 25.5 months respectively. Increased age was a predictor for persistent lymphopenia (B = 0.071, p = 0.004) while sex, and previous DMT were not.

Multiple sclerosis and related disorders published new progress about 624-49-7. 624-49-7 belongs to esters-buliding-blocks, auxiliary class Inhibitor,Natural product, name is Dimethyl fumarate, and the molecular formula is C11H14O4, Product Details of C6H8O4.

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

Yougnia, Rodrigue published the artcileOne-pot synthesis of novel poly-substituted phenanthrenes, Product Details of C15H21BO4, the publication is Tetrahedron (2010), 66(15), 2803-2808, database is CAplus.

A one-pot synthesis of novel poly-substituted phenanthrenes is described in this article through a Suzuki-Miyaura cross-coupling followed by a Dieckmann-Thorpe ring closure under microwave irradiation The selection of the appropriate starting materials allowed us to introduce diversity on various positions of the phenanthrene ring system.

Tetrahedron published new progress about 956229-86-0. 956229-86-0 belongs to esters-buliding-blocks, auxiliary class Boronic acid and ester,Benzene,Ester,Boronate Esters,Boronic acid and ester, name is Methyl 2-(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)acetate, and the molecular formula is C13H19BO3, Product Details of C15H21BO4.

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

Verdugo, Felipe published the artcilePalladium-Catalyzed Tandem Cycloisomerization/Cross-Coupling of Carbonyl- and Imine-Tethered Alkylidenecyclopropanes, Related Products of esters-buliding-blocks, the publication is Angewandte Chemie, International Edition (2022), 61(24), e202202295, database is CAplus and MEDLINE.

Pd⁰ catalysts featuring phosphorus-based monodentate ligands was detour the reactivity of carbonyl-tethered alkylidenecyclopropanes (ACPs) from standard (3+2) cycloadditions towards tandem cycloisomerization/cross-coupling processes. This new reactivity lies on the formation of key π-allyl oxapalladacyclic intermediates, which were subsequently trapped with external nucleophilic partners, instead of undergoing canonical C-O reductive eliminations. Importantly, the use of imine-tethered ACP’s was also feasible. Therefore, the method provided a straightforward and stereoselective entry to a wide variety of highly functionalized cyclic alcs. and amines.

Angewandte Chemie, International Edition 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 C15H23BO2, Related Products of esters-buliding-blocks.

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

Gao, Yuan published the artcileFrontal Polymerization of Thin Layers on a Thermally Insulating Substrate, Recommanded Product: Trimethylolpropane triacrylate, the publication is ACS Applied Polymer Materials (2022), 4(7), 4919-4927, database is CAplus.

Motivated by the use of frontal polymerization for the manufacturing of thin layers with thickness down to 1̃00μm, we numerically and exptl. investigate the interplay between the exothermic polymerization and the heat losses to the substrate. The results show how the reaction-diffusion power balance affects the velocity and temperature of the polymerization front. The lower thickness limit of the thin layer depends on the cure kinetics of the resin and the thermal properties of the substrate and is described by a scaling law. Concurrently, thin-layer frontal polymerization experiments confirm the effects of front-substrate interaction on the front propagation and the limiting thickness of the polymerized layer. The present study offers a fundamental understanding of the resin-substrate interplay in thin-layer frontal polymerization and provides a quant. description of the limiting thickness of the layer in the fabrication of functional thin polymeric parts and resin coatings.

ACS Applied Polymer Materials published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C15H20O6, Recommanded Product: Trimethylolpropane triacrylate.

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

Andrade, Romano published the artcileOptimization of a pheromone lure for Spodoptera frugiperda (Smith) in Central America, SDS of cas: 16974-11-1, the publication is Journal of the Brazilian Chemical Society (2000), 11(6), 609-613, database is CAplus.

Mass trapping of Spodoptera frugiperda (Smith) in Central America required a high performance lure with consistent capture rates. S. frugiperda lures from North America and England gave erratic capture rates under field conditions. A reinvestigation of four acetate attractants (Z9-14Ac, Z11-16Ac, Z7-12Ac and Z9-12Ac) for S. frugiperda present in Costa Rica revealed that Z7-12Ac and Z9-12Ac were highly attractive to S. frugiperda when presented alone. Binary combination of Z7-12Ac with Z9-14Ac significantly increased attraction and was at least 10 times more attractive to S. frugiperda in Costa Rica than North American or English lures. Addition of Z11-16Ac to binary combinations of Z9-14Ac and Z7-12Ac marginally increased capture rates. If the concentration of Z7-12Ac is increased to 5% in lures containing Z9-14Ac, Z11-16Ac and Z7-12Ac capture rates significantly decrease. The optimized lure contains Z7-12Ac that is a component not previously reported in S. frugiperda from the Caribbean region.

Journal of the Brazilian Chemical Society published new progress about 16974-11-1. 16974-11-1 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is (Z)-Dodec-9-en-1-yl acetate, and the molecular formula is C14H26O2, SDS of cas: 16974-11-1.

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

Dong, Xichang published the artcileMerging shuttle reactions and paired electrolysis for reversible vicinal dihalogenations, Synthetic Route of 5205-11-8, the publication is Science (Washington, DC, United States) (2021), 371(6528), 507-514, database is CAplus and MEDLINE.

Vicinal dibromides and dichlorides are important commodity chems. and indispensable synthetic intermediates in modern chem. that are traditionally synthesized using hazardous elemental chlorine and bromine. Meanwhile, the environmental persistence of halogenated pollutants necessitates improved approaches to accelerate their remediation. Here, we introduce an electrochem. assisted shuttle (e-shuttle) paradigm for the facile and scalable interconversion of alkenes and vicinal dihalides, a class of reactions that can be used both to synthesize useful dihalogenated mols. from simple alkenes and to recycle waste material through retro-dihalogenation. The reaction is demonstrated using 1,2-dibromoethane, as well as 1,1,1,2-tetrachloroethane or 1,2-dichloroethane, to dibrominate or dichlorinate, resp., a wide range of alkenes in a simple setup with inexpensive graphite electrodes. Conversely, the hexachlorinated persistent pollutant lindane could be fully dechlorinated to benzene in soil samples using simple alkene acceptors.

Science (Washington, DC, United States) 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, Synthetic Route of 5205-11-8.

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

Kim, Junheon published the artcileA co-attractant mixture of (Z)-11-tetradecenyl acetate and (Z)-9-dodecenyl acetate for Neocalyptis angustilineata and Homona magnanima, HPLC of Formula: 16974-11-1, the publication is Journal of Asia-Pacific Entomology (2014), 17(4), 659-661, database is CAplus.

While monitoring for the seasonal occurrence of the tea tortrix moth, Homona magnanima Diakonoff (Lepidoptera: Tortricidae), a number of Neocalyptis angustilineata (Walsingham) were attracted to traps baited with H. magnanima attractant, a 9:1 blend of (Z)-11-tetradecenyl acetate (Z11-14Ac) and (Z)-9-dodecenyl acetate (Z9-12Ac). We evaluated a 1:1 blend (1 mg) and a 9:1 blend (1 mg) of Z11-14Ac and Z9-12Ac for their attractiveness to the two moth species. H. magnanima was attracted only to the 9:1 blend. However, N. angustilineata was equally attracted to both blends. Thus, we report the 9:1 blend as a co-attractant for N. angustilineata and H. magnanima. This blend is the first finding for the attractant for N. angustilineata.

Journal of Asia-Pacific Entomology published new progress about 16974-11-1. 16974-11-1 belongs to esters-buliding-blocks, auxiliary class Aliphatic Chain, name is (Z)-Dodec-9-en-1-yl acetate, and the molecular formula is C14H26O2, HPLC of Formula: 16974-11-1.

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

Han, Li-Jun published the artcilePalladium-Catalyzed Methoxycarbonylation of 1,3-Butadiene to Methyl-3-Pentenoate: Introduction of a Continuous Process, Recommanded Product: Dimethyl adipate, the publication is Journal of Catalysis (2021), 283-290, database is CAplus.

The base-assisted Pd(cod)Cl₂/xantphos-catalyzed methoxycarbonylation of 1,3-butadiene (BD) to methyl-3-pentenoate (MP) was explored. Mechanistic studies suggested excessive xantphos (beyond an equimolar amount per Pd) as well as its substitute, pyridines of proper steric and electronic functionality, do participate catalytic cycle and significantly reduce activation energy by accelerating rate-limiting methanolysis step. As thus, all reaction parameters, especially solvents, were optimized based on Pd(cod)Cl₂/Xantphos/4-hexylpyridine catalytic system, enabling construction of a continuous process. Systematic optimization demonstrated that a yield of 82% of MP with a purity of 99.8% could be reached under steady-state operation.

Journal of Catalysis 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, Recommanded Product: Dimethyl adipate.

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