Tag: 200-300

Biodiesel production from biomass gasification tar via thermal/catalytic cracking was written by Laksmono, Nino;Paraschiv, Maria;Loubar, Khaled;Tazerout, Mohand. And the article was included in Fuel Processing Technology in 2013.COA of Formula: C12H22O4 This article mentions the following:

This paper is devoted to the study of valorization of tar from biomass gasification as a fuel for internal combustion engine. The methods selected were both thermal cracking and catalytic cracking in the presence of zeolite, magnesium oxide, and aluminum oxide catalyst. The chem. composition of the cracking product was analyzed by gas chromatog.-mass spectrometry, together with the physico-chem. properties determination (d., viscosity, higher heating value, and acidic value). Thermal cracking of biomass gasification tar gave a yield of biodiesel 73.67 weight% of feed. The cracking process in the presence of zeolite, magnesium oxide, and aluminum oxide catalysts gave a yield of biodiesel 62-75 weight%, 55-66 weight%, 67-71 weight% resp. The influence of the type and quantity of catalyst on production yield and properties of the produced bio-oil is highlighted. The produced bio-oil d. and heating value were close to the conventional diesel fuel. The viscosity and acidic value were found to be slightly higher than that of conventional diesel fuel. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6COA of Formula: C12H22O4).

Dimethyl decanedioate (cas: 106-79-6) 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.COA of Formula: C12H22O4

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

Catalytic esterification with solid acid HPM was written by Fu, Xiangkai;Liu, Qiang;Hua, Yanqing;Liu, Chenglun;Liu, Shoujun. And the article was included in Shiyou Huagong in 1989.Product Details of 1190-39-2 This article mentions the following:

Solid acid HPM (sic) was used as the catalyst for preparing 22 esters of acetic acid, propionic acid, propanedioic acid, and benzoic acid with yields of 76-96%. Exptl. results indicate esters from primary and secondary alcs. and aliphatic carboxylic acids, aliphatic dicarboxylic acids, and aromatic carboxylic acids can be obtained by direct esterification with the solid acid HPM catalyst. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Product Details of 1190-39-2).

malonic acid dibutyl ester (cas: 1190-39-2) 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.Product Details of 1190-39-2

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

Carbon suboxide and some of its reactions. XX. Reaction of carbon suboxide with sodium alcoholates was written by Dashkevich, L. B.;Pechenyuk, V. A.. And the article was included in Zhurnal Obshchei Khimii in 1965.Recommanded Product: malonic acid dibutyl ester This article mentions the following:

Passage of C₃O₂ into RONa in ROH gave colorless precipitates, which heated with EtI 4-6 hrs. gave CH₂(CO₂R)₂ and EtCH(CO₂R)₂, resp. (R shown): Me, 91%, b₇₆₂ 179-81°, and 0%; Et, 95%, b₇₅₂ 197-8°, and 0%; Pr, 80%, b₇₆₂ 229-30°, d²⁰₂₀ 0.9798, n²⁰_D 1.4204, and 13.9%, b₇₆₂ 240-1°, 0.9863, 1.4219; Bu, 56%, b₅ 118-20°, 0.9650, 1.4265, and 37.3%, b₅ 130-2°, 0.9531, 1.4281; n-C₆H₁₃, 41.6%, b₆ 143-5°, 0.9211, 1.4370, and 53%, b₆ 168-70°, 0.9053, 1.4310; n-C₇H₁₅, 38.8%, b₇ 173-5°, 0.9228, 1.4365, and 61%, b₇ 190-2°, 0.9159, 1.4388; cyclohexyl, 38.2%, b₁₀ 168-70°, 1.0154, 1.4725, and 46%, b₁₀ 190-1°, 1.0289, 1.4742; n-C₈H₁₇, 0%, and 84.5%, b₇ 209-11°, –, 1.4430. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Recommanded Product: malonic acid dibutyl ester).

malonic acid dibutyl ester (cas: 1190-39-2) 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. 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: malonic acid dibutyl ester

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

Evaluation of stereochemically dense morpholine-based scaffolds as proline surrogates in β-turn peptides was written by Sladojevich, Filippo;Guarna, Antonio;Trabocchi, Andrea. And the article was included in Organic & Biomolecular Chemistry in 2010.Product Details of 133467-01-3 This article mentions the following:

Four peptides differing for the structure of the new morpholine-based heterocyclic compound acting as a turn inducer were synthesized in solution phase, and the conformational preferences were assessed by means of NMR anal. All spectroscopic data revealed an adaptive behavior of the turn peptides in generating turn conformations stabilized by intramol. hydrogen-bonds, despite the conformational changes of the turn inducer. Thus, this study suggests the possibility of functionalizing morpholine-containing β-turn peptides with no significant loss of the secondary framework. The 3,4-dihydro-2H-[1,4]oxazine-containing peptide showed a more compact structure stabilized by an addnl. γ-turn-forming hydrogen-bond experienced by the Gly amide proton. In the experiment, the researchers used many compounds, for example, Boc-D-Leu-OMe (cas: 133467-01-3Product Details of 133467-01-3).

Boc-D-Leu-OMe (cas: 133467-01-3) 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.Product Details of 133467-01-3

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

Barbituric acids. I. Synthesis of methylenebis(5-alkyl-barbituric acids) was written by Levina, R. Ya.;Godovikov, N. N.. And the article was included in Zhurnal Obshchei Khimii in 1954.Product Details of 10203-58-4 This article mentions the following:

CH₂(CO₂Et)₂ with paraform and 10% alc. KOH gave 60-70% CH₂[CH(CO₂Et)₂]₂ (I), b₅ 174-5°, n²⁰_D 1.4425, d₂₀ 1.119; mercuration with Hg(OAc)₂ gave the di-HgCl derivative, decompose 165-7° (from EtOH-Me₂CO). I (34 g.) added to 4.6 g. Na in 150 ml. dry EtOH, then RX added dropwise (the heating being interrupted for the addition), and the mixture heated until the basic reaction had nearly disappeared gave by the usual treatment the following (EtO₂C)₂CRCH₂CR'(CO₂Et)₂, (R, R’, % yield, b.p./mm., and n²⁰_D shown): Me, Me, 30.8, 190-1°/10, 1.4470; H, Me, 11.5, 78-9°/10, 1.4132; H, Et, 30.5, 74-5°/3, 1.4152; Et, Et, -, – (m. 62-3°), -; H, Pr, 32.3, 114-16°/3, 1.4198; Pr, Pr, 40, 206-8°/11 (m. 41-2°), -; Bu, Bu, 37.4, 198-9°/5, 1.4522; H, Bu, 30, 124-8°/18, 1.4226; H, PhCH₂, not isolated; PhCH₂,PhCH₂, 17, 240-5°/4 (m. 44°), -. The reactions yielded minor amounts of the polymers of I, m. 156° [cf. Bottomley and Perkin, J. Chem. Soc. 77, 306(1900)]. Alkylation attempts with iso-PrX, iso-BuX, iso-AmX (where X is halide), and cyclohexyl chloride, failed; only the corresponding RCH(CO₂Et)₂, polymer of I, and unreacted starting material were isolated. The reaction of the dialkylated esters with urea in the presence of EtONa yielded the following, 5,5′-methylenebis(5,1-alkylbarbituric acids) (alkyl group shown): H, 45%, decompose 300°; Me, 44.8%, m. 252-3°; Et, 61.7%, decompose 364-5°; Pr, 56.2%, decompose 358-9°; Bu, 25.4%, m. 235-8°; PhCH₂, 15.3%, m. 210-11°. The ring closures were run 18 hrs. at 120°. In the experiment, the researchers used many compounds, for example, Diethyl isobutylmalonate (cas: 10203-58-4Product Details of 10203-58-4).

Diethyl isobutylmalonate (cas: 10203-58-4) 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.Product Details of 10203-58-4

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

Axially chiral amino acid scaffolds as efficient fluorescent discriminators of methanol-ethanol was written by Bag, Subhendu Sekhar;Jana, Subhashis. And the article was included in New Journal of Chemistry in 2017.Recommanded Product: tert-Butyl (3-ethynylphenyl)carbamate This article mentions the following:

The authors report a unique fluorescence sensor based on an axially chiral unnatural triazolyl aromatic amino acid scaffold (^ArTAA) for discrimination of methanol from ethanol via a switch on fluorescence response. All three sensors, the simple scaffold (^ArTAA), and the mono- (PyAm-^ArTAA) and bis-pyrenyl- (Py₂Am-^ArTAA) amides, show similar sensitivity and detection limit ranging from 0.5-2.1 volume/volume% of ethanol. The solid films of these sensors also are effective in sensing ethanol vapor via generation of a distinct and enhanced fluorescence signal. All the authors’ exptl. results suggest the role of axial chirality of the hairpin-shaped scaffold in differential solvation guided H-bonding interaction and discriminating between ethanol and methanol with a switch-on fluorescence response. In the experiment, the researchers used many compounds, for example, tert-Butyl (3-ethynylphenyl)carbamate (cas: 185619-66-3Recommanded Product: tert-Butyl (3-ethynylphenyl)carbamate).

tert-Butyl (3-ethynylphenyl)carbamate (cas: 185619-66-3) 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. 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.Recommanded Product: tert-Butyl (3-ethynylphenyl)carbamate

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

Novel Cambinol Analogs as Sirtuin Inhibitors: Synthesis, Biological Evaluation, and Rationalization of Activity was written by Medda, Federico;Russell, Rupert J. M.;Higgins, Maureen;McCarthy, Anna R.;Campbell, Johanna;Slawin, Alexandra M. Z.;Lane, David P.;Lain, Sonia;Westwood, Nicholas J.. And the article was included in Journal of Medicinal Chemistry in 2009.SDS of cas: 33166-79-9 This article mentions the following:

The tenovins and cambinol are two classes of sirtuin inhibitor that exhibit antitumor activity in preclin. models. This report describes modifications to the core structure of cambinol, in particular by incorporation of substituents at the N1-position, which lead to increased potency and modified selectivity. These improvements have been rationalized using mol. modeling techniques. The expected functional selectivity in cells was also observed for both a SIRT1 and a SIRT2 selective analog. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9SDS of cas: 33166-79-9).

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

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

The organocatalytic highly enantioselective Knoevenagel condensation: applications in the synthesis of various chiral amide derivatives was written by Ashokkumar, Veeramanoharan;Siva, Ayyanar;Sankar, Balakrishnan. And the article was included in Journal of the Iranian Chemical Society in 2019.Application of 1190-39-2 This article mentions the following:

In this work, efficient organocatalysts were designed, synthesized and successfully applied to the Knoevenagel condensation. In this reaction, different α-branched aldehydes were treated with various malonate compounds to give the desired unsaturated diester products [R¹ = H, 4-Me, 3-F, etc.; R² = Me, Et, Bn, etc.] up to 97% yield and excellent e.r up to 99.68:0.32 under the mild reaction conditions. Moreover, the Knoevenagel product, unsaturated diesters I was converted into different chiral amide derivatives II [R³ = n-BuNH, PhNH, N-morpholinyl, pyrrolidin-1-yl, 4-pyridylamino] in higher enantioselectivity. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Application of 1190-39-2).

malonic acid dibutyl ester (cas: 1190-39-2) 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. 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 1190-39-2

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

Synthesis of Heterobiaryl 4-Aryl Furans through a Base-Promoted Decarboxylative Propargylation/Cycloisomerization Annulation was written by Wang, Sasa;Song, Meimei;Li, Xiuguang;Huang, Yunhong;Zhao, Tingxiang;Wei, Zhuoji;Lan, Yanyun;Tan, Haibo. And the article was included in Organic Letters in 2020.Safety of Ethyl 3-oxo-3-(m-tolyl)propanoate This article mentions the following:

A transition-metal-free synthesis of heterobiaryl 4-aryl furans through a base-promoted decarboxylative propargylation/cycloisomerization annulation of ethynyl benzoxazinanones and readily accessible β-keto esters or 1,3-diketones has been developed. A series of novel heterobiaryl 4-aryl furans were accessed efficiently in the presence of base under mild reaction conditions. This protocol is significant for probing the reaction mechanism of ethynyl benzoxazinanones and even other propargylic compounds In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Safety of Ethyl 3-oxo-3-(m-tolyl)propanoate).

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

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

Photochemistry of enolizable β-dicarbonyl compounds: study on the photoketonization of some esters of aroylacetic acids was written by Markov, P.;Petkov, I.;Eglova, D.. And the article was included in Journal of Photochemistry in 1978.HPLC of Formula: 33166-79-9 This article mentions the following:

Photolysis of RC₆H₄COCH₂CO₂Et (R = H, Me, MeO, NO₂, Cl, Br) results in a shift of the keto-enol equilibrium toward the keto form. Rate constants and quantum yields were determined Electron-releasing substituents in the para position favor ketonization. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9HPLC of Formula: 33166-79-9).

Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) 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. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.HPLC of Formula: 33166-79-9

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