Tag: 200-300

Nickel-selective coated disk electrode based on carbon nanotube composite modified with a new Schiff base was written by Tashkhourian, J.;Ghaderizadeh, S. M.;Montazerozohori, M.. And the article was included in Russian Journal of Electrochemistry in 2015.Application of 106-79-6 This article mentions the following:

A coated disk polyvinyl chloride (PVC) matrix membrane ion-selective electrode for detection of nickel ion was fabricated based on multiwalled carbon nanotube composite modified with bis(2-hydroxyacetophenone)-1,2-propandiimine (BHAPN) as ionophore. The electrode showed a Nernstian slope of 29.7 ± 0.45 mV decade^-1 over a wide concentration range of 9.1 × 10^-7 to 2.0 x 10^-2 mol L^-1 of Ni(NO₃)₂ with detection limit of 3.2 x 10^-7 mol L^-1. This electrode was applicable in the pH range of 3.0-7.9 and had a short response time of approx. 6.0 s. The electrode exhibited good selectivity for Ni(II) relative to other metal ions. The use of multiwalled carbon nanotube (MWCNTs) in a polymer matrix improves the linear range and sensitivity of the electrode. The practical anal. utility of the electrode was demonstrated by the using it as an indicator electrode for potentiometric titration of Ni(II) ions with EDTA solution In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Application of 106-79-6).

Dimethyl decanedioate (cas: 106-79-6) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Application of 106-79-6

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Diastereomeric (η⁴-diene)Fe(CO)₃ complexes containing chiral amide groups: a convenient method for the resolution of amino acids was written by Schumacher, Marc;Coste, Gerald;Miesch, Laurence. And the article was included in Synthesis in 2009.Electric Literature of C12H23NO4 This article mentions the following:

Diastereomeric (η⁴-N-substituted-hexa-2,4-dienamide)Fe(CO)₃ complexes bearing chiral amide groups were used for the resolution of (η⁴-dienecarboxylic acid)Fe(CO)₃ complexes. Using the latter, enantiomerically pure proteinogenic or nonproteinogenic α-amino acids were prepared In the experiment, the researchers used many compounds, for example, Boc-D-Leu-OMe (cas: 133467-01-3Electric Literature of C12H23NO4).

Boc-D-Leu-OMe (cas: 133467-01-3) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Electric Literature of C12H23NO4

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Straightforward Enantioselective Access to γ-Butyrolactones Bearing an All-Carbon β-Quaternary Stereocenter was written by Meninno, Sara;Fuoco, Tiziana;Tedesco, Consiglia;Lattanzi, Alessandra. And the article was included in Organic Letters in 2014.Application of 33166-79-9 This article mentions the following:

An enantioselective one-pot aldol/lactonization sequence has been developed to access highly challenging γ-butyrolactones bearing an all-carbon quaternary stereocenter at the β-position by reacting acylated succinic esters with aqueous formaldehyde in the presence of 3 mol % loading of a cinchona alkaloid-derived squaramide providing direct access to paraconic acid derivatives in high yield and fairly good level of enantioselectivity (up to 88% ee). Thus, e.g., keto diester I (R¹ = 2-phenyl-2-Pr, R³ = Me) + paraformaldehyde in presence of epi-hydroquinine-derived squaramide afforded lactone II in 79% yield and 78% ee. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Application of 33166-79-9).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Application of 33166-79-9

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Stereocontrolled Alkylative Construction of Quaternary Carbon Centers was written by Kummer, David A.;Chain, William J.;Morales, Marvin R.;Quiroga, Olga;Myers, Andrew G.. And the article was included in Journal of the American Chemical Society in 2008.Related Products of 10203-58-4 This article mentions the following:

Protocols for the stereodefined formation of α,α-disubstituted enolates of pseudoephedrine amides are presented followed by the implementation of these in diastereoselective alkylation reactions. Direct alkylation of α,α-disubstituted pseudoephedrine amide substrates is demonstrated to be both efficient and diastereoselective across a range of substrates, as exemplified by alkylation of the diastereomeric pseudoephedrine α-methylbutyramides, where both substrates are found to undergo stereospecific replacement of the α-C-H bond with α-C-alkyl, with retention of stereochem. This is shown to arise by sequential stereospecific enolization and alkylation reactions, with the alkyl halide attacking a common π-face of the E- and Z-enolates, proposed to be opposite the pseudoephedrine alkoxide side chain. Pseudoephedrine α-phenylbutyramides are found to undergo highly stereoselective but not stereospecific α-alkylation reactions, which evidence suggests is due to facile enolate isomerization. Also α,α-disubstituted pseudoephedrine amide enolates can be generated in a highly stereocontrolled fashion by conjugate addition of an alkyllithium reagent to the s-cis-conformer of an α-alkyl-α,β-unsaturated pseudoephedrine amide, providing α,α-disubstituted enolate substrates that undergo alkylation in the same sense as those formed by direct deprotonation. Methods are presented to transform the α-quaternary pseudoephedrine amide products into optically active carboxylic acids, ketones, primary alcs., and aldehydes. In the experiment, the researchers used many compounds, for example, Diethyl isobutylmalonate (cas: 10203-58-4Related Products of 10203-58-4).

Diethyl isobutylmalonate (cas: 10203-58-4) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Related Products of 10203-58-4

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthesis of aromatic azomethines from 4′-aminopropiophenone, vanillin, vanillal, and their derivatives was written by Dikusar, E. A.;Potkin, V. I.;Kozlov, N. G.. And the article was included in Vestsi Natsyyanal’nai Akademii Navuk Belarusi, Seryya Khimichnykh Navuk in 2006.Reference of 20665-85-4 This article mentions the following:

New aromatic azomethines containing keto, ether and ester groups, e.g., (E)-I, were synthesized by reaction of vanillin, vanillal, and their esters with 4′-aminopropiophenone in anhydrous methanol. In the experiment, the researchers used many compounds, for example, 4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4Reference of 20665-85-4).

4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Reference of 20665-85-4

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Retention indices of symmetric dicarboxylic acid esters was written by Lipp, S. V.;Krasnykh, E. L.;Levanova, S. V.. And the article was included in Journal of Analytical Chemistry in 2008.Reference of 1190-39-2 This article mentions the following:

Retention indexes of 28 sym dicarboxylic acid esters containing from two to six carbon atoms in the acid residue were determined exptl. The temperature dependences of the retention indexes were linear. Equations probably predict the retention indexes for sym. and mixed C2-C6 dicarboxylic acid esters. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Reference of 1190-39-2).

malonic acid dibutyl ester (cas: 1190-39-2) belongs to esters. Volatile esters with characteristic odours are used in synthetic flavours, perfumes, and cosmetics. Certain volatile esters are used as solvents for lacquers, paints, and varnishes. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Reference of 1190-39-2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Unsymmetrical α,ω-Difunctionalized Long-Chain Compounds via Full Molecular Incorporation of Fatty Acids was written by Witt, Timo;Stempfle, Florian;Roesle, Philipp;Haeussler, Manuel;Mecking, Stefan. And the article was included in ACS Catalysis in 2015.Product Details of 3903-40-0 This article mentions the following:

α,ω-Difunctionalized long-chain compounds A-(CH₂)_n-B are valuable intermediates and monomers. Unsym. compounds with two different functional groups (A ≠ B) are, however, only accessible by multistep traditional organic syntheses to date. We report on their generation in a single step by isomerizing alkoxycarbonylations of the double bond deep in the chain of oleic derivatives The compatibility with amide, nitrile and imide functionalities in the substrate allows for the formation with high linear selectivities (ca. 90%) and conversions (70 to 96%) of unsym. diesters, ester-amides, ester-nitriles and ester-(N-imides) in which these functional groups are terminally attached to a ≥ 17 methylene unit chain. These products further provide access to carboxylic acid-esters, alc.-esters and amino-esters, and polymers from these AB-monomers. Undesired transesterifications that scramble the A and B functionalities are suppressed completely (<0.1%) by the utilization of a Pd(II) catalyst precursor devoid of acid additives in the presence of amine base. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Product Details of 3903-40-0).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Acyl chlorides and acid anhydrides alcoholysis is another way to produce esters. Acyl chlorides and acid anhydrides react with alcohols to produce esters. Anydrous conditions are recommended since both acyl chlorides and acid anhydrides react with water.Product Details of 3903-40-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Catalytic Performance and Electrophoretic Behavior of an Yttrium-Organic Framework Based on a Tricarboxylic Asymmetric Alkyne was written by Perez, Juana M.;Rojas, Sara;Garcia-Garcia, Amalia;Montes-Andres, Helena;Ruiz Martinez, Cristina;Romero-Cano, Manuel S.;Choquesillo-Lazarte, Duane;Abdelkader-Fernandez, Victor Karim;Perez-Mendoza, Manuel;Cepeda, Javier;Rodriguez-Dieguez, Antonio;Fernandez, Ignacio. And the article was included in Inorganic Chemistry in 2022.Application In Synthesis of Dimethyl 5-ethynylisophthalate This article mentions the following:

A new Yttrium-based metal-organic framework (MOF) GR-MOF-6 with chem. formula {[YL(DMF)₂]·(DMF)}_n (H₃L = 5-((4-carboxyphenyl)ethynyl) isophthalic acid, DMF = DMF) was prepared by solvothermal route. The structural characterization reveals that this novel material is a 3-dimensional MOF in which the coordination of the tritopic ligand to Y(III) metal ions leads to an intercrossing channel system extending over three dimensions. This material showed to be a very efficient catalyst in the cyanosilylation of carbonyls, being the 2nd in highest catalytic activity among the reported rare earth metal-based MOFs described so far but with the lowest required catalyst loading. Its electrophoretic behavior was studied in deep providing a zero-charge point at pH between 4 and 5, and with the highest electrophoretic mobility of -1.553μm cm/V·s and a ζ-potential of -19.8 mV at pH 10. In the experiment, the researchers used many compounds, for example, Dimethyl 5-ethynylisophthalate (cas: 313648-56-5Application In Synthesis of Dimethyl 5-ethynylisophthalate).

Dimethyl 5-ethynylisophthalate (cas: 313648-56-5) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Application In Synthesis of Dimethyl 5-ethynylisophthalate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

NMR spectroscopic study of tautomeric systems. V. Effect of substituents in the benzene ring and in the ester group on chemical shifts in PMR spectra of benzoylacetates was written by Zheglova, D. Kh.;Ershov, B. A.;Kol’tsov, A. I.. And the article was included in Zhurnal Organicheskoi Khimii in 1974.Recommanded Product: Ethyl 3-oxo-3-(m-tolyl)propanoate This article mentions the following:

NMR spectra of RC6H4COCH2CO2Et (R = p-Me2N, p-Br, m-Me, p-Me, and o-, m-, and p-Cl, -NO2 and -OMe) and of PhCOCH2CO2R (R = Me, Et, Pr, Me2CH, Bu, Me3C) were correlated with structure. Also prepared and characterized were p-RC6H4COCH2CO2R1 (R =MeO, R1 = Pr, Me2CH, Bu, Me2CHCH2, Me3C; R = NO2, R1 = Pr, Me2CH, Bu, Me3C). In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Recommanded Product: Ethyl 3-oxo-3-(m-tolyl)propanoate).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Cyclic esters are called lactones, regardless of whether they are derived from an organic or inorganic acid. One example of an organic lactone is γ-valerolactone.Recommanded Product: Ethyl 3-oxo-3-(m-tolyl)propanoate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Aminoethylenes: A Tetrahedral Intermediate Isostere Yielding Potent Inhibitors of the Aspartyl Protease BACE-1 was written by Yang, Wenjin;Lu, Wanli;Lu, Yafan;Zhong, Min;Sun, Jian;Thomas, Anila E.;Wilkinson, Jennifer M.;Fucini, Raymond V.;Lam, Melissa;Randal, Mike;Shi, Xiao-Ping;Jacobs, Jeffrey W.;McDowell, Robert S.;Gordon, Eric M.;Ballinger, Marcus D.. And the article was included in Journal of Medicinal Chemistry in 2006.Application In Synthesis of Boc-D-Leu-OMe This article mentions the following:

A series of novel β-site amyloid precursor protein cleaving enzyme (BACE-1) inhibitors containing an aminoethylene (AE) tetrahedral intermediate isostere were synthesized and evaluated in comparison to corresponding hydroxyethylene (HE) compounds Enzymic inhibitory values were similar for both isosteres, as were structure-activity relationships with respect to stereochem. preference and substituent variation (P2/P3, P1, and P2′); however, the AE compounds were markedly more potent in a cell-based assay for reduction of β-secretase activity. The incorporation of preferred P2/P3, P1, and P2′ substituents into the AE pharmacophore yielded compound I, which possessed enzymic and cell assay IC₅₀s of 26 nM and 180 nM, resp. A three-dimensional crystal structure of I in complex with BACE-1 revealed that the amino group of the inhibitor core engages the catalytic aspartates in a manner analogous to hydroxyl groups in HE inhibitors. The AE isostere class represents a promising advance in the development of BACE-1 inhibitors. In the experiment, the researchers used many compounds, for example, Boc-D-Leu-OMe (cas: 133467-01-3Application In Synthesis of Boc-D-Leu-OMe).

Boc-D-Leu-OMe (cas: 133467-01-3) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Liquid esters of low volatility serve as softening agents for resins and plastics. Esters also include many industrially important polymers. Polymethyl methacrylate is a glass substitute sold under the names Lucite and Plexiglas; polyethylene terephthalate is used as a film (Mylar) and as textile fibres sold as Terylene, Fortrel, and Dacron.Application In Synthesis of Boc-D-Leu-OMe

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics