Month: February 2023

Action of acetic anhydride in the presence of perchloric acid on ethyl 2-cyclopentanoneglyoxalate was written by Traverso, G.;Pirillo, D.. And the article was included in Farmaco, Edizione Scientifica in 1972.Quality Control of Ethyl 2-oxo-2-(2-oxocyclopentyl)acetate This article mentions the following:

The bis(enol acetate) I is obtained by the title reaction, and the cyclopentaneglycoxylate esters II and III are prepared from I. I is hydrogenated, saponified, and esterified to give IV and V. II and III are obtained by the Jones oxidation of IV and V. In the experiment, the researchers used many compounds, for example, Ethyl 2-oxo-2-(2-oxocyclopentyl)acetate (cas: 39163-39-8Quality Control of Ethyl 2-oxo-2-(2-oxocyclopentyl)acetate).

Ethyl 2-oxo-2-(2-oxocyclopentyl)acetate (cas: 39163-39-8) 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. Polyesters are important plastics, with monomers linked by ester moieties. 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.Quality Control of Ethyl 2-oxo-2-(2-oxocyclopentyl)acetate

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

One-pot synthesis of 3-amino-4-aryl- and 3-amino-4-hetarylfurazans was written by Sheremetev, A. B.. And the article was included in Russian Chemical Bulletin in 2005.Related Products of 33166-79-9 This article mentions the following:

A one-pot process involving hydrolysis of the corresponding ester of a β-aryl- or β-hetaryl-β-oxo acid, nitrosation at the activated methylene group, and treatment of the resulting intermediate with an alk. solution of hydroxylamine in the presence of urea, afforded the title compounds In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Related Products of 33166-79-9).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) 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.Related Products of 33166-79-9

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

Divergent Synthesis of Molecular Winch Prototypes was written by Gisbert, Yohan;Abid, Seifallah;Kammerer, Claire;Rapenne, Gwenael. And the article was included in Chemistry – A European Journal in 2021.Synthetic Route of C18H28BNO4 This article mentions the following:

We report the synthesis of conceptually new prototypes of mol. winches [(η⁵-R₄C₅-bp-XTrzR¹)(Ind₃BH)Ru] [R = 4-FcC₆H₄; bp = 1,1′-biphenyl-4,4′-diyl; X = CH₂NHCOCH₂CH₂(OCH₂CH₂)₈; Trz = 1,2,3-triazole-1,4-diyl; R¹ = 9-triptycenyl (tpc), CH₂CH₂OCOC(C₆₀)CO₂Et, 3,5-C₆H₃(CC-9-tpc)₂, 10,20-(CCtpc)₂Por-Zn] with the ultimate aim to investigate the work performed by a single ruthenium-based mol. motor anchored on a surface by probing its ability to pull a load upon elec.-driven directional rotation. According to a technomimetic design, the motor was embedded in a winch structure, with a long flexible polyethylene glycol chain terminated by an azide hook to connect a variety of mol. loads. The structure of the motor was first derivatized by means of two sequential cross-coupling reactions involving a penta(4-halogenophenyl)cyclopentadienyl hydrotris(indazolyl)borate ruthenium(II) precursor and the resulting benzylamine derivative was next exploited as key intermediate in the divergent synthesis of a family of nanowinch prototypes. A one-pot method involving sequential peptide coupling and Cu-catalyzed azide-alkyne cycloaddition was developed to yield four loaded nanowinches, with load fragments encompassing triptycene, fullerene and porphyrin moieties. In the experiment, the researchers used many compounds, for example, tert-Butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzylcarbamate (cas: 330794-35-9Synthetic Route of C18H28BNO4).

tert-Butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzylcarbamate (cas: 330794-35-9) 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. 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.Synthetic Route of C18H28BNO4

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

Transition-Metal-Free Approach to Polysubstituted Furans was written by You, Changming;Zhang, Zhenming;Tu, Yongliang;Tang, Hong;Wang, Yuanfeng;Long, Da;Zhao, Junfeng. And the article was included in Journal of Organic Chemistry in 2020.Safety of Ethyl 3-oxo-3-(thiophen-2-yl)propanoate This article mentions the following:

A convenient and straightforward strategy for the synthesis of 2,3-disubstituted and 2,3,5-trisubstituted furans via a base-promoted domino reaction of β-keto compounds with vinyl dichlorides is described. This transition-metal-free approach proceeds under operationally simple reaction conditions featuring easily available starting materials, a broad substrate scope, and good functional group tolerance. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8Safety of Ethyl 3-oxo-3-(thiophen-2-yl)propanoate).

Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8) 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, including apples, durians, pears, bananas, pineapples, and strawberries. 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. Safety of Ethyl 3-oxo-3-(thiophen-2-yl)propanoate

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

Novel dihydropyridine thioglycosides and their corresponding dehydrogenated forms as potent anti-hepatocellular carcinoma agents was written by Elgemeie, Galal H.;El-Naggar, Dina H.. And the article was included in Nucleosides, Nucleotides & Nucleic Acids in 2018.Electric Literature of C16H22O11 This article mentions the following:

A novel method for preparation of a new class of dihydropyridine thioglycosides and their corresponding dehydrogenated forms, via reaction of piperidinium salts of dihydropyridinethiones with 2,3,4,6-tetra-O-acetyl-α-D-gluco- and galactopyranosyl bromides has been studied. The evaluation of antiproliferative activity against HepG-2 cell lines (liver carcinoma cell lines) of the dihydropyridine thioglycosides and pyridine thioglycosides revealed that many of the thioglycosides have interesting antitumor activities specifically , and . In the experiment, the researchers used many compounds, for example, (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4Electric Literature of C16H22O11).

(2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Electric Literature of C16H22O11

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

Regularities of the kinetics of miniemulsion polymerization of styrene in the presence of dithiobenzoates as reversible chain transfer agents was written by Serkhacheva, N. S.;Tolkachev, A. V.;Chernikova, E. V.;Prokopov, N. I.. And the article was included in Russian Chemical Bulletin in 2015.Formula: C14H12S2 This article mentions the following:

The results of comparative kinetic study of the miniemulsion controlled radical polymerization of styrene in the presence of reversible chain transfer agents (benzyl dithiobenzoate and polystyrene dithiobenzoate) and bulk polymerization of similar systems are presented. The influence of the reactant nature and dithiobenzoate concentration of the kinetics of the process is discussed. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Formula: C14H12S2).

Benzyl benzodithioate (cas: 27249-90-7) 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. Polyesters are important plastics, with monomers linked by ester moieties. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Formula: C14H12S2

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

gcProfileMakeR: an R package for automatic classification of constitutive and non-constitutive metabolites was written by Perez-Sanz, Fernando;Ruiz-Hernandez, Victoria;Terry, Marta I.;Arce-Gallego, Sara;Weiss, Julia;Navarro, Pedro J.;Egea-Cortines, Marcos. And the article was included in Metabolites in 2021.HPLC of Formula: 868-57-5 This article mentions the following:

Metabolomes comprise constitutive and non-constitutive metabolites produced due to physiol., genetic or environmental effects. However, finding constitutive metabolites and non-constitutive metabolites in large datasets is tech. challenging. We developed gcProfileMakeR, an R package using standard Excel output files from an Agilent Chemstation GC-MS for automatic data anal. using CAS numbers gcProfileMakeR has two filters for data preprocessing removing contaminants and low-quality peaks. The first function NormalizeWithinFiles, samples assigning retention times to CAS. The second function NormalizeBetweenFiles, reaches a consensus between files where compounds in close retention times are grouped together. The third function getGroups, establishes what is considered as Constitutive Profile, Non-constitutive by Frequency i.e., not present in all samples and Non-constitutive by Quality. Can be plotted with the plotGroup function. We used it to analyze floral scent emissions in four snapdragon genotypes. These included a wild type, Deficiens nicotianoides and compacta affecting floral identity and RNAi:AmLHY targeting a circadian clock gene. We identified differences in scent constitutive and non-constitutive profiles as well as in timing of emission. gcProfileMakeR is a very useful tool to define constitutive and non-constitutive scent profiles. It also allows to analyze genotypes and circadian datasets to identify differing metabolites. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5HPLC of Formula: 868-57-5).

Methyl2-methylbutyrate (cas: 868-57-5) 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.HPLC of Formula: 868-57-5

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

Chemistry of phosphodiesters, DNA and models. 3. Microgonotropens and their interactions with DNA. 1. Synthesis of the tripyrrole peptides dien-microgonotropen-a, -b, and -c and characterization of their interactions with dsDNA was written by He, Gong Xin;Browne, Kenneth A.;Groppe, Jay C.;Blasko, Andrei;Mei, Houng Yau;Bruice, Thomas C.. And the article was included in Journal of the American Chemical Society in 1993.Recommanded Product: Ethyl 4-nitro-1H-pyrrole-2-carboxylate This article mentions the following:

Exploration of the novel idea of employing a pyrrole nitrogen of a tripyrrole peptide minor groove binding agent to carry catalytic entities to the phosphates and major groove to DNA has been initiated with the synthesis of dien-microgonotropen-a, -b, and -c [I; R = (CH₂)_nN(CH₂CH₂CH₂NMe₂)₂, n = 3-5] (II). Replacing the carboxyl terminal amidine and amino terminal formyl functionalities of distamycin (Dm) by CH₂NMe₂ and Ac substituents, resp., provides I (R = Me), which has greater stability in water than does Dm. The synthetic design allows the N-Me substituent on the central pyrrole of I (R = Me) to be replaced by connectors terminating in a dien ligand (II). The binding of I (R = Me) is about 20-fold weaker than the binding of II to calf thymus DNA, poly(dA-dT), and poly(dI-dC) due to the contribution of the polyamine substituents of the latter. The specificity and affinity of binding of II to the 5′-[³²P] 167-bp EcoRI/RsaI restriction fragment of pBR322 was determined by DNase I footprint anal. Specific inhibition of cleavage was observed at each of the four potential A+T-rich binding sites after preincubation with II at concentrations as high as 50 μM. At 250 μM, binding at short heteropolymeric A+T secondary sites distal to the cluster of A+T-rich primary binding sites was observed At such higher concentrations of II, increased rates of enzymic cleavage at specific sequences were observed DNase I footprinting anal. of the 3′-labeled fragment provided complementary results. Electrophoretic migration of HaeIII restriction digest fragments of φX-174-RF DNA after preincubation with II was used to assess induction of gross conformational changes in DNA mols. As the concentration of the agents increases, the effect of the agents in changing the conformation of larger DNA fragments decreases in the order II (n = 5) > II (n = 4) > II (n = 3) ≫ Dm > Hoechst 33258. The electrophoretic mobilities of smaller DNA fragments are unaltered in the presence of the various agents. The dien-microgonotropens are much more effective in inducing changes than the sum of the Dm and bis[3-(dimethylamino)propyl]methylamine parts. This is due to the unique relationship between the minor groove binding portion of the dien-microgonotropens and the accompanying electrostatic complexing of the covalently attached dien moiety to the phosphodiester backbone of DNA. In the experiment, the researchers used many compounds, for example, Ethyl 4-nitro-1H-pyrrole-2-carboxylate (cas: 5930-92-7Recommanded Product: Ethyl 4-nitro-1H-pyrrole-2-carboxylate).

Ethyl 4-nitro-1H-pyrrole-2-carboxylate (cas: 5930-92-7) 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. 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.Recommanded Product: Ethyl 4-nitro-1H-pyrrole-2-carboxylate

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

Synthesis of diphenyl sulfides. V. Nitro group mobility in 4-nitrodiphenyl sulfide derivatives was written by Sevbo, D. P.;Stepanova, T. F.;Nekhoroshev, A. A.. And the article was included in Zhurnal Organicheskoi Khimii in 1980.COA of Formula: C9H9NO5 This article mentions the following:

5,4,2-BrCl(O₂N)C₆H₂O₂Et reacted with 2-O₂NC₆H₄SH (I) in DMF containing Et₃N to give 4,2,5-Cl(X)(2-O₂NC₆H₄S)C₆H₂CO₂Et (X = O₂N, 2-O₂NC₆H₄S). Analogous reaction of 5,2-Cl(O₂N)C₆H₃CO₂Me (II) gave 2,5-X(2-O₂NC₆H₄S)C₆H₃CO₂Me (same X), but II and PhSH gave only 2,5-(PhS)₂C₆H₃CO₂Me under these conditions. Similarly, 5,2,3-Br(O₂N)(MeO)C₆H₂CO₂Me and I gave only 3,2,5-MeO(2-O₂NC₆H₄S)₂C₆H₂CO₂Me. However, 2-O₂NC₆H₄R [R = CO₂Me, SC₆H₄NO₂-4, SC₆H₃(NO₂)Me-4,3, SC₆H₂(CO₂Me)(NO₂)NH₂-3,4,5] were inert to arylthiolates. Dinitro esters III (R = Me, R¹ = H, Me; R = CH₂Ph, R¹ = H; X = Br) reacted with I to give to corresponding III (X = 2-O₂NCH₄S) and disubstitution product IV in ≥9:1 ratio. IV (R = CH₂Ph, R¹ = H) were cleaved with refluxing CF₃CO₂H to give 77% IV (R = R¹ = H), which reacted with CH₂N₂ to give IV (R = R¹ = Me). The latter, also prepared by treating III (R = R¹ = Me; X = Br) with excess II, was hydrogenated over Raney Ni to give PhNH₂ and 2,5-X¹(MeO)C₆H₃CO₂Me (V; X¹ = H₂N) and then acetylated to give V (X¹ = AcNH), which was also prepared analogously from 2,5-O₂N(MeO)C₆H₃CO₂H. In the experiment, the researchers used many compounds, for example, Methyl 5-methoxy-2-nitrobenzoate (cas: 2327-45-9COA of Formula: C9H9NO5).

Methyl 5-methoxy-2-nitrobenzoate (cas: 2327-45-9) 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. 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.COA of Formula: C9H9NO5

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

Identification of an impurity in diuretic paraflutizide and its detection in the dosage form was written by Blaschke, Gottfried;Maibaum, Juergen. And the article was included in Pharmazeutische Zeitung in 1985.Electric Literature of C10H11FO2 This article mentions the following:

During experiments in the chromatog. separation of enantiomers, a considerable amount of an impurity was detected in paraflutizide (I) [1580-83-2]. This impurity, also detectable by TLC, was identified by spectroscopic methods as 6-chloro-3-(2-fluorobenzyl)-3,4-dihydro-2H-1,2,4-benzothiadiazine-7-sulfonamide-1,1-dioxide (II) [96782-83-1]. An unambiguous synthesis confirmed this structure. ¹⁹F-NMR spectroscopy enabled the fast and reliable identification of II in a I-containing dosage form besides a large excess of other ingredients. In the experiment, the researchers used many compounds, for example, Ethyl 2-fluorophenylacetate (cas: 584-74-7Electric Literature of C10H11FO2).

Ethyl 2-fluorophenylacetate (cas: 584-74-7) 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. 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 C10H11FO2

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