Tag: 200-300

Synthesis of malonic esters catalyzed by tin tetrachloride adsorbed with active carbon was written by Xue, Laiqi;Zhang, Zhihong;Qi, Hongjiang. And the article was included in Huaxue Shijie in 1998.Quality Control of malonic acid dibutyl ester This article mentions the following:

Malonic esters (di-Pr malonate, di-Bu malonate, diisobutyl malonate, diamyl malonate, dioctyl malonate) were synthesized through the reaction of malonic acid with corresponding alcs. under the catalysis of SnCl₄. 5H₂O adsorbed with activated C. The water produced in the synthesis reaction was carried off by benzene. The esterification rate for di-Bu malonate was 96.8%. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Quality Control of malonic acid dibutyl ester).

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. 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 malonic acid dibutyl ester

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

Directed resolution of enantiomers by liquid chromatography of diastereomeric derivatives. 7. Syntheses of the stereoisomers of 17,21-dimethylheptatriacontane – sex recognition pheromone of the tsetse fly was written by Ade, Eugen;Helmchen, Guenter;Heiligenmann, Gudrun. And the article was included in Tetrahedron Letters in 1980.Safety of malonic acid dibutyl ester This article mentions the following:

(R,R)- And (S,S)-Me(CH₂)₁₅CHMe(CH₂)₃CHMe(CH₂)₁₅Me [(R,R)- and (S,S)-I] were both prepared in nine steps from (±)-Me(CH₂)₁₅CHMeCO₂H via diastereomeric amides and in eight steps in an asym. preparation from the ester II [R = Me for (S,S)-I; R = Me(CH₂)₁₅ for (R,R)-I]. (R,S)-I was also prepared In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Safety of malonic acid dibutyl ester).

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. 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.Safety of malonic acid dibutyl ester

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

Dynamic Kinetic Resolution Enabled by Intramolecular Benzoin Reaction: Synthetic Applications and Mechanistic Insights was written by Zhang, Guoxiang;Yang, Shuang;Zhang, Xiaoyan;Lin, Qiqiao;Das, Deb. K.;Liu, Jian;Fang, Xinqiang. And the article was included in Journal of the American Chemical Society in 2016.Related Products of 33166-79-9 This article mentions the following:

The highly enantio-, diastereo-, and regioselective dynamic kinetic resolution of β-ketoesters and 1,3-diketones was achieved via a chiral N-heterocyclic carbene catalyzed intramol. cross-benzoin reaction. A variety of tetralone derivatives bearing two contiguous stereocenters and multiple functionalities were liberated in moderate to excellent yields and with high levels of stereoselectivity (>95% ee and >20:1 dr in most cases). In addition, the excellent regioselectivity control for aryl/alkyl 1,3-diketones, and the superior electronic differentiation of 1,3-diarylketones were highlighted. Moreover, a set of new mechanistic rationale that differs with the currently widely accepted understanding of intramol. benzoin reactions was established to demonstrate the superior preference of benzoin over aldol transformation. A coexistence of competitive aldol and benzoin reactions was detected, but a retro-aldol-irreversible benzoin process performs a vital role in the generation of predominant benzoin products. The most essential role of an N-electron-withdrawing substituent in triazolium catalysts was revealed to be accelerating the rate of the benzoin transformation, rather than suppressing the aldol process through reducing the inherent basicity of the catalyst. 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. 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.Related Products of 33166-79-9

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

Studies on ketene and its derivatives. CX. Synthesis of 1,3-dimethoxyfluoren-9-ones was written by Nakano, Jun;Katagiri, Nobuya;Kato, Tetsuzo. And the article was included in Chemical & Pharmaceutical Bulletin in 1982.Quality Control of Ethyl 3-oxo-3-(m-tolyl)propanoate This article mentions the following:

1,3-Dimethoxyfluoren-9-ones (I; R, R² = H, Me, MeO; R¹ = H; R¹R² = benzo) were prepared from dihydroxybenzoates (II; R = H, R⁴ = EtO) (III). Thus, cyclocondensation of diketene with Et 3-aryl-3-oxopropionates in the presence of NaH in THF gave III, which were treated with MeI followed by alc. NaOH to give II (R³ = Me, R⁴ = HO) (IV). Cyclization of IV with (CF₃CO)₂O gave I. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Quality Control of Ethyl 3-oxo-3-(m-tolyl)propanoate).

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

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

Copper-Catalyzed Cross-Coupling of Thiols, Alcohols, and Oxygen for the Synthesis of Esters was written by Lim, Seungyeon;Ji, Miran;Wang, Xi;Lee, Chan;Jang, Hye-Young. And the article was included in European Journal of Organic Chemistry in 2015.SDS of cas: 27249-90-7 This article mentions the following:

Copper-catalyzed, one-pot, three-component coupling reactions using thiols, alcs., and oxygen to form a variety of esters in good yields were studied. In the presence of easily oxidized benzylic and allylic alcs., thiols were selectively oxidized to form thionoesters, which underwent facile S/O exchange to afford esters. Thiols may be used as an alternative benzoyl source under mild aerobic conditions. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7SDS of cas: 27249-90-7).

Benzyl benzodithioate (cas: 27249-90-7) 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. 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.SDS of cas: 27249-90-7

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

Reaction of alkyl malonates with nitric acid was written by Glowczyk, Joanna;Lange, Jerzy;Abramski, Jan W.. And the article was included in Roczniki Chemii in 1977.Product Details of 10203-58-4 This article mentions the following:

The title reaction with fuming HNO₃ gave RC(NO₂)(CO₂Et)₂ (I; R = Me, Et, Me₂CH, Bu, Me₂CHCH₂, Me₃C) and RC(OH)(CO₂Et)₂ (II); the ratio I–II depended on the temperature At low temperature II was favored and at high temperature I was favored. The degree of conversion depended on R. 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. 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.Product Details of 10203-58-4

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

Synthesis of (E)-azomethines from 4-aminobenzenesulfonamide (streptocide) derivatives was written by Dikusar, E. A.;Petkevich, S. K.;Potkin, V. I.;Stepin, S. G.. And the article was included in Vestsi Natsyyanal’nai Akademii Navuk Belarusi, Seryya Khimichnykh Navuk in 2015.Reference of 20665-85-4 This article mentions the following:

Synthesis of (E)-azomethines, derivatives of 4-aminobenzenesulfonamide (Streptocidum), by condensation of substituted vanillin-like benzaldehydes with streptocide in methanol, has been described. 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. 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. 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.Reference of 20665-85-4

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

Luminescence and Configurations of Perylene Dimers in a Langmuir-Blodgett Film was written by Mahrt, J.;Willig, F.;Storck, W.;Weiss, D.;Kietzmann, R.;Schwarzburg, K.;Tufts, B.;Troesken, B.. And the article was included in Journal of Physical Chemistry in 1994.Quality Control of 12-Methoxy-12-oxododecanoic acid This article mentions the following:

Luminescence and excitation spectra of a Langmuir-Blodgett multilayer with a high concentration of densely packed perylene chromophores are measured at 2 K. They are compared with corresponding spectra of the dimeric α-perylene crystal and of perylene dimers formed in a glass. The majority of the perylene chromophores are arrested in the Langmuir-Blodgett film in the form of open metastable dimer configurations with monomer-like spectra. They dominate the absorption spectrum and excitation spectrum of luminescence. From these open dimers the excitation energy is rapidly transferred to the lower excited state of a stable dimer species functioning as a trap. Luminescence from this excited g-state leads to the peak at 550 nm in the luminescence spectrum. A second peak at 630 nm and the red side of the luminescence spectrum are due to E-excimer luminescence. The wide spectral range of the luminescence, extending from below 500 nm up to 800 nm, reflects sub-angstrom differences in the configurations of the dimers. In the experiment, the researchers used many compounds, for example, 12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0Quality Control of 12-Methoxy-12-oxododecanoic acid).

12-Methoxy-12-oxododecanoic acid (cas: 3903-40-0) 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. 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.Quality Control of 12-Methoxy-12-oxododecanoic acid

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

Compound-Specific Radiocarbon Analysis of Low Molecular Weight Dicarboxylic Acids in Ambient Aerosols Using Preparative Gas Chromatography: Method Development was written by Xu, Buqing;Cheng, Zhineng;Gustafsson, Orjan;Kawamura, Kimitaka;Jin, Biao;Zhu, Sanyuan;Tang, Tiangang;Zhang, Bolong;Li, Jun;Zhang, Gan. And the article was included in Environmental Science & Technology Letters in 2021.Recommanded Product: 1190-39-2 This article mentions the following:

Low mol. weight dicarboxylic acids constitute a large fraction of atm. organic aerosols, which impact atm. radiative forcing and hence Earth’s climate. Radiocarbon (¹⁴C) is a unique approach to unambiguously distinguishing the relative contributions of biomass-derived and fossil sources. Here, we developed a compound-specific radiocarbon anal. (CSRA) method for individual dicarboxylic acids in atm. particulates. Specifically, the method starts with a di-Bu ester derivatization technique, followed by separation and harvesting of single compounds employing a preparative capillary gas chromatog. in sufficient amounts for offline ¹⁴C measurement with accelerator mass spectrometry. The optimized preparative steps yielded recoveries of >60% and purities of >99% for target mols. The radiocarbon isotope compositions determined for reference standards taken through the entire method agree well with the original composition of each standard (R² = 0.9998). The applicability of the approach was demonstrated with ambient aerosol samples representing contrasting air mass regimes. This yielded two radically different yet system-consistent precursor sources. A min. size of 50μg of C of ambient dicarboxylic acids is needed for credible ¹⁴C measurement. The established method for CSRA of dicarboxylic acids demonstrates a new anal. dimension for studies of the source and evolution of atm. secondary organic aerosols. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Recommanded Product: 1190-39-2).

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

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

Recovery of wolframite from tungsten mine tailings by the combination of shaking table and flotation with a novel ”crab” structure sebacoyl hydroxamic acid was written by Huang, Zhiqiang;Zhang, Shiyong;Wang, Hongling;Liu, Rukuan;Cheng, Chen;Shuai, Shuyi;Hu, Yajing;Zeng, Yuhui;Yu, Xinyang;He, Guichun;Fu, Weng;Burov, Vladimir E.;Poilov, Vladimir Z.. And the article was included in Journal of Environmental Management in 2022.Recommanded Product: 106-79-6 This article mentions the following:

Tailings ponds for gangue mineral storage are widely recognized as a dangerous source of toxic minerals and heavy metal-bearing solution Therefore, recovering valuable minerals and critical elements from tailings is an important means to protect the environment in an economic way. Wolframite tailings usually contain a considerable amount of tungsten resources, but the presence of high content of kaolinite sludge makes it very difficult to recycle wolframite. Herein, a novel sebacoyl hydroxamic acid (SHA) was synthesized and introduced as a novel wolframite collector to effectively utilize wolframite tailings, and its collection performance was compared with that of benzohydroxamic acid (BHA). Micro-flotation tests showed that SHA could still obtain 80% wolframite recovery in the presence of kaolinite slimes. Bench-scale flotation tests indicated that SHA can effectively recover wolframite concentrate with 55.64% WO₃ grade and 75.28% WO₃ recovery from wolframite tailings by the combined shaking table-flotation process. Polarized light microscope observations showed that SHA could promote the formation of hydrophobic agglomerates of wolframite particles. These results show that SHA can be used as an efficient collector for disposing of wolframite tailings, and provide an important reference for the development of efficient and comprehensive utilization of tailings. In the experiment, the researchers used many compounds, for example, Dimethyl decanedioate (cas: 106-79-6Recommanded Product: 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. 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.Recommanded Product: 106-79-6

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