Month: December 2022

Kang, Suk Hoon published the artcileEmbedding Nanofibers in a Polymer Matrix by Polymerization of Organogels Comprising Heterobifunctional Organogelators and Monomeric Solvents, Category: esters-buliding-blocks, the publication is Chemistry of Materials (2008), 20(17), 5532-5540, database is CAplus.

We demonstrate the embedding of nanofibers in a polymer matrix through the polymerization of an organogel. A series of organogelators based on a biphenyl ester having two different polymerizable groups, namely, acryl and diacetylene groups, are prepared The resulting heterobifunctional gelators show the ability to gelate various monomeric solvents. The photopolymerization of an organogel of a heterobifunctional gelator (1.5 or 10 wt %), formed in hexyl methacrylate (HMA), is carried out by UV irradiation in the presence of 2,2-dimethoxy-2-phenylacetophenone (photoinitiator, 4 wt %). The polymerization of HMA forms a polymer matrix, while the polymerization of the acryl and diacetylene groups of the gelator forms the nanofibers with a cross-linked structure. The copolymerization of a gelator and HMA at the interface will improve the adhesion between the nanofiber and the polymer matrix. The polymerized gels appear yellowish and exhibit strong fluorescence when irradiated with 365 nm UV light. This is due to the presence of polydiacetylene chains. The fluorescent polydiacetylene nanofibers embedded in the polymer matrix are visualized by using confocal laser scanning microscopy. The thermal and mech. properties of the nanofibers embedded in polyHMA are investigated using differential scanning calorimetry, dynamic mech. anal., and a universal testing machine. The polymerized gels show improved thermal and phys. properties in comparison to the matrix polymer (polyHMA).

Chemistry of Materials published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Category: esters-buliding-blocks.

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

Badet, Bernard published the artcilePhase-transfer alkylation with sulfonium salts, COA of Formula: C12H14O2, the publication is Synthesis (1980), 926-9, database is CAplus.

Sulfonium salts are effective alkylating agents under phase-transfer conditions. Thus PhSO₂H was treated with K₂CO₃ and Me₂C:CHCH₂S⁺(C₁₂H₂₅)₂ ClO^4- in CH₂Cl₂ at room temperature to give 78% Me₂C:CHCH₂SO₂Ph. BzOH similarly gave 88% BzOCH₂CH:CMe₂. Treatment of KOAc with C₆H₁₃S⁺Ph₂ ClO₄^– gave 80% hexyl acetate.

Synthesis 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

Gauchet, F. published the artcileRegiochemistry of alkylation of benzoate and hydrogen dibenzoate anions with 1,1-dimethylallyl and 3,3-dimethylallyldimethylsulfonium salts. Influence of copper(I), Recommanded Product: 3-Methylbut-2-en-1-yl benzoate, the publication is Bulletin de la Societe Chimique de France (1990), 268-74, database is CAplus.

CH₂:CHCMe₂S⁺Me₂ BF₄^– (I) was prepared by methylation of CH₂:CHCMe₂SMe, to compare its reactivity towards substitution to that of Me₂C:CHCH₂S⁺Me₂ BF₄^– (II). Substitution by benzoate is remarkably sensitive to the nature of the nucleophile: whereas, the reaction of PhCO₂K with I gives a 50:50 mixture of primary and tertiary esters, potassium hydrogen dibenzoate leads exclusively to the tertiary ester. In the presence of copper(I) the tertiary benzoate is the only product obtained with both nucleophiles, as in the case of II; this result is consistent with the involvement of a π-allyl copper intermediate common to both isomers.

Bulletin de la Societe Chimique de France 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, Recommanded Product: 3-Methylbut-2-en-1-yl benzoate.

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

Badet, B. published the artcileEffect of copper salts on the alkylation of carboxylate ions by sulfonium salts, Name: 3-Methylbut-2-en-1-yl benzoate, the publication is Tetrahedron (1983), 39(19), 3111-25, database is CAplus.

BzOK, AcOK, and BzOH-K₂CO₃ were alkylated using sulfonium salts Ph₂S⁺R, PhS⁺R¹R², R³S⁺R⁴₂, or R⁵R⁶S⁺CH₂CH:CH₂ [R = Me, Et, Pr, Bu, allyl, CHMe₂, CH₂Ph; R¹, R⁶ = lauryl, Me; R² = allyl, lauryl; R³ = Me, Pr, CHMe₂, CMe₃, allyl, methallyl, 2-octyl, prenyl, lauryl; R⁴ = Me, Pr, allyl, lauryl, (CH₂)_4,5; R⁵ = Et, Ph]. Mixtures of esters were obtained. In the presence of Cu(I) salts, the reaction of allylic sulfonium salts became very selective in favor of the unsaturated residues. Prenyl sulfonium salts, which reacted through the α-position in the absence of Cu salts, gave exclusively tertiary esters when a catalytic amount of CuBr was present.

Tetrahedron 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, Name: 3-Methylbut-2-en-1-yl benzoate.

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

Danko, Lisa published the artcileField evaluation of pheromone-baited traps for monitoring grape berry moth (Lepidoptera: Olethreutidae), Category: esters-buliding-blocks, the publication is Journal of Economic Entomology (1983), 76(3), 480-3, database is CAplus.

Four pheromone trap designs (Pherocon IC, Pherocon ICP, Delta, and Kitterman), trap placement on the trellis, and 2 com. sex pheromone dispensers (Pherocon rubber septa and Albany International capillary tubes) were evaluated for specificity and use for monitoring the grape berry moth (Endopiza viteana, GBM) in Erie County, Pa., during 1979 and 1981 using the pheromone cis-9-dodecenyl acetate  [16974-11-1]. Placement of pheromone dispenser within the trap and an entrance modification on the Delta trap were also studied. The traps were about equal in their ability to capture GBM, although the Pherocon ICP trap captured fewer GBM than the Pherocon IC trap in one test. Both pheromone dispensers were effective in attracting GBM, but the Albany International dispenser attracted significantly more of a nontarget moth, Episimus argutanus. No differences were observed in number of GBM captured when pheromone dispensers were placed at various locations in the various traps. Traps captured the most GBM and were easiest to service when hung from the top trellis wire. The Delta trap captured fewer E. argutanus when the entrance was enlarged by leaving the flaps open. A nontarget species, the redbanded leafroller (Argyrotaenia velutiana) was captured in low numbers in all pheromone and trap combinations.

Journal of Economic 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, Category: esters-buliding-blocks.

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

Lutter, Ferdinand H. published the artcileFacile Conversion of Molecularly Complex (Hetero)aryl Carboxylic Acids into Alkynes for Accelerated SAR Exploration, Category: esters-buliding-blocks, the publication is Chemistry – A European Journal (2021), 27(60), 14816-14820, database is CAplus and MEDLINE.

Herein, a functional-group-tolerant and operationally simple decarbonylative alkynylation that allows the conversion of complex (hetero)aryl carboxylic acids into alkynes were reported. Furthermore, the utility of this method was demonstrated in the preparation of a triazolo analog of the com. drug moclobemide. Lastly, mechanistic investigations using labeled carboxylic acid derivatives clearly show the decarbonylative nature of this transformation.

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 C9H8O4, Category: esters-buliding-blocks.

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

Estep, Kimberly G. published the artcileSynthesis and Structure-Activity Relationships of 6-Heterocyclic-Substituted Purines as Inactivation Modifiers of Cardiac Sodium Channels, Quality Control of 115314-17-5, the publication is Journal of Medicinal Chemistry (1995), 38(14), 2582-95, database is CAplus and MEDLINE.

Purine-based analogs of SDZ 211-500 were prepared and evaluated as inactivation modifiers of guinea pig or human cardiac sodium (Na) channels expressed in Xenopus oocytes. Substances which remove or slow the Na channel inactivation process in cardiac tissue are anticipated to prolong the effective refractory period and increase inotropy and thus have potential utility as antiarrhythmic agents. Heterocyclic substitution at the 6-position of the purine ring resulted in compounds with increased Na activity and potency, with 5-membered heterocycles being optimal. Only minor modifications to the benzhydrylpiperazine side chain were tolerated. Selected compounds which delayed the inactivation of Na channels were found to increase refractoriness and contractility in a rabbit Langendorff heart model, consistent with the cellular mechanism. Activity in both the oocyte and rabbit heart assays was specific to the S-enantiomers. Preliminary in vivo activity has been demonstrated following i.v. infusion. The most promising compound on the basis of in vitro data is the formylpyrrole (S)-I, which is 25-fold more potent than DPI 201-106 in the human heart Na channel assay.

Journal of Medicinal Chemistry published new progress about 115314-17-5. 115314-17-5 belongs to esters-buliding-blocks, auxiliary class Epoxides,Chiral,Nitro Compound,Sulfonate,Benzene, name is (R)-Oxiran-2-ylmethyl 3-nitrobenzenesulfonate, and the molecular formula is C9H9NO6S, Quality Control of 115314-17-5.

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

Krause, Frederick C. published the artcileScreening electrolytes designed for high voltage electrochemical capacitors, Recommanded Product: Ethyl (2,2,2-trifluoroethyl) carbonate, the publication is Electrochimica Acta (2021), 137898, database is CAplus.

Standard acetonitrile/tetraalkylammonium-tetrafluoroborate-based electrochem. capacitor electrolytes were modified with both fluorinated additives (including fluorinated analogs of ethylmethyl carbonate and di-Et carbonate, lithium difluoro(oxalato)borate, and tris(2,2,2-trifluoroethyl) phosphite) and spiro(1,1′)-bipyrrolidinium tetrafluoroborate salt, to improve stability at higher voltages (>2.7 V). Compounds investigated included (2,2,2-trifluoroethyl) Me carbonate (TFEMC), ethyl(2,2,2-trifluoroethyl) carbonate (ETFEC), bis(2,2,2-trifluoroethyl) carbonate (bTFEC), lithium difluoro(oxalato)borate (LiDFOB), and tris(2,2,2-trifluoroethyl) phosphite (TTFEPi). Screening of modified electrolytes in prototype coin cells using constant current cycling and voltage hold test protocols revealed good retention of capacitance and a reduced cell internal resistance growth when operating at maximum voltages between 3.5 and 4.0 V. These results suggest new strategies for increasing the operating limits of elec. double-layer type supercapacitors, to increase stored energy and improve their compatibility with lithium-ion battery cells for use in hybrid configurations.

Electrochimica Acta published new progress about 156783-96-9. 156783-96-9 belongs to esters-buliding-blocks, auxiliary class Trifluoromethylated Building Blocks, name is Ethyl (2,2,2-trifluoroethyl) carbonate, and the molecular formula is C5H7F3O3, Recommanded Product: Ethyl (2,2,2-trifluoroethyl) carbonate.

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

Crasto, Curtis F. published the artcileA Practical method for preparation of β-glycosides of N-acetylglucosamine, SDS of cas: 10378-06-0, the publication is Tetrahedron Letters (2004), 45(25), 4891-4894, database is CAplus.

A mild and efficient method for preparation of GlcNAc derivatives by reaction of glycosyl acceptors with glycosyl oxazolines has been developed. The key feature is use of Yb(OTf)₃ as promoter, requiring moderate reaction times and equivalence stoichiometry. We anticipate application in the preparation of a wide range of derivatives of this biol. important class of building blocks.

Tetrahedron Letters 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 C14H19NO8, SDS of cas: 10378-06-0.

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

Kumar, Ish published the artcileA Thioesterase for Chemoselective Hydrolysis of S-Acyl Sulfanylalkanoates, Synthetic Route of 19788-49-9, the publication is Organic Letters (2001), 3(2), 283-285, database is CAplus and MEDLINE.

A thioesterase, isolated from a strain of Alcaligenes sp. ISH108, chemoselectively hydrolyzes the thiol ester moiety of S-acyl sulfanylalkanoates. The application of the enzyme has been demonstrated in the preparation of the antihypertensive agent captopril.

Organic Letters published new progress about 19788-49-9. 19788-49-9 belongs to esters-buliding-blocks, auxiliary class Thiol,Aliphatic hydrocarbon chain,Ester, name is Ethyl 2-mercaptopropanoate, and the molecular formula is C5H10O2S, Synthetic Route of 19788-49-9.

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