Tag: 200-300

A Convenient Synthesis of 2-Fluoro- and 2-Chloromalonic Esters Mediated by Hypervalent Iodine was written by Kitamura, Tsugio;Muta, Kensuke;Oyamada, Juzo. And the article was included in Synthesis in 2015.Safety of malonic acid dibutyl ester This article mentions the following:

Direct fluorination of malonic esters with a reagent system of iodosylbenzene and Et₃N·5HF gave the corresponding 2-fluoromalonic esters in good to high yields. Direct chlorination using iodosylbenzene and hydrochloric acid also provided the 2-chloromalonates in high yields. 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 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 malonic acid dibutyl ester

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

Controlling Polymer Composition in Organocatalyzed Photoredox Radical Ring-Opening Polymerization of Vinylcyclopropanes was written by Chen, Dian-Feng;Boyle, Bret M.;McCarthy, Blaine G.;Lim, Chern-Hooi;Miyake, Garret M.. And the article was included in Journal of the American Chemical Society in 2019.Safety of malonic acid dibutyl ester This article mentions the following:

Although radical polymerizations are among the most prevalent methodologies for the synthesis of polymers with diverse compositions and properties, the intrinsic reactivity and selectivity of radical addition challenge the ability to impart control over the polymerization propagation and produce polymers with defined microstructure. Vinylcyclopropanes (VCPs) can be polymerized through radical ring-opening polymerization to produce polymers possessing linear (l) or cyclic (c) repeat units, providing the opportunity to control polymer structure and modify the polymer properties. Herein, we report the first organocatalyzed photoredox radical ring-opening polymerization of a variety of functionalized VCP monomers, where high monomer conversions and spatial and temporal control were achieved to produce poly(VCPs) with predictable mol. weight and low dispersity. Through manipulating polymerization concentration and temperature, tunable l or c content was realized, allowing further investigation of thermal and viscoelastic materials properties associated with these two distinct compositions Unexpectedly, the photoredox catalysis enables a postpolymn. modification that converts l content into the c content. Combined exptl. and computational studies suggested an intramol. radical cyclization pathway, where cyclopentane and cyclohexane repeat units are likely formed. 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. 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.Safety of malonic acid dibutyl ester

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

Regioselective synthesis of 2,3,4- or 2,3,5-trisubstituted pyrroles via [3,3] or [1,3] rearrangements of O-vinyl oximes was written by Wang, Heng-Yen;Mueller, Daniel S.;Sachwani, Rachna M.;Kapadia, Rachel;Londino, Hannah N.;Anderson, Laura L.. And the article was included in Journal of Organic Chemistry in 2011.Name: Ethyl 3-oxo-3-(m-tolyl)propanoate This article mentions the following:

The regioselective synthesis of 2,3,4- or 2,3,5-trisubstituted pyrroles e. g., I has been achieved via [3,3] and [1,3] sigmatropic rearrangements of O-vinyl oximes, resp. Iridium-catalyzed isomerization of easily prepared O-allyl oximes enables rapid access to O-vinyl oximes. Optimization and scope of the O-allyl oxime isomerization and subsequent pyrrole formation are discussed and mechanistic pathways are proposed. The regioselectivity of pyrrole formation can be controlled by either the identity of the α-substituent or through the addition of an amine base. When enolization is favored, a [3,3] rearrangement followed by a Paal-Knorr cyclization provides a 2,3,4-trisubstituted pyrrole; when enolization is disfavored, a [1,3] rearrangement occurs prior to enolization to produce a 2,3,5-trisubstituted pyrrole after cyclization. Conditions are provided for selecting either the [3,3] rearrangement or the [1,3] rearrangement product with β-ester O-allyl oxime substrates. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Name: 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. 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.Name: Ethyl 3-oxo-3-(m-tolyl)propanoate

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

Polymerization of an activated ester monomer based on 4-vinylsulfonic acid and its polymer analogous reaction was written by Nilles, Katja;Theato, Patrick. And the article was included in Polymer Chemistry in 2011.Related Products of 27249-90-7 This article mentions the following:

Homopolymers containing sulfonic ester side groups were synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization utilizing benzyl dithiobenzoate, cumyl dithiobenzoate, and 4-cyano-4-((thiobenzoyl)sulfanyl)pentanoic acid as chain transfer agents. Likewise diblock copolymers containing poly(styrene), poly(octylstyrene) and poly(pentafluorostyrene) as the second block were synthesized. Addnl., nitroxide mediated polymerization (NMP) was investigated for the synthesis of a homopolymer as well as for a diblock copolymer. Furthermore, the post-polymerization functionalization with various amines to yield the resp. sulfonamides was conducted. The conversion was analyzed by ¹H NMR spectroscopy, ¹⁹F NMR spectroscopy and FT-IR spectroscopy and in many cases a very high conversion (>96%) was observed In addition the reaction kinetics of the post-polymerization functionalization of poly(pentafluorophenyl 4-vinylbenzene sulfonate) and the corresponding carboxyl ester poly(pentafluorophenyl 4-vinylbenzoate) were compared by anal. of the reactions by time-resolved ¹⁹F NMR spectroscopy. It was found that poly(pentafluorophenyl 4-vinylbenzoate) showed a higher stability towards hydrolysis and a significantly higher reactivity, resulting in complete conversions with different amines. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Related Products of 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. 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. Related Products of 27249-90-7

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

Extractables from integrated single-use systems in biopharmaceutical manufacturing. Part I. Study on components (Pall Kleenpak connector and Kleenpak filter capsule) was written by Ding, Weibing;Nash, Rebecca. And the article was included in PDA Journal of Pharmaceutical Science and Technology in 2009.Product Details of 1190-39-2 This article mentions the following:

Single-use systems for manufacturing biopharmaceuticals can include filter capsules, connectors, tubing, and polymeric film biocontainers. In order to tackle the variety of extractable compounds from these fairly complex systems, we first studied such systems’ representative components, and then examined an entire single-use system comprised of filters, connectors, tubing, and biocontainers. This approach greatly simplifies the identification of the extractable compounds from the whole system. The test design was based on common, actual processes conducted under worst-case conditions. Part 1 of this series of papers describes a systematic study of extractables from two components, a sterile connector and a capsule filter, in water and ethanol as model solvent extractants. The complete extractables results were obtained using a combination of qualified anal. methods. The results indicated that the potential for the connector and the capsule filter to release leachable materials in significant amounts into the chem. compatible drug product is very low, taking into account the less vigorous conditions in most processes and dilution effects when compared to the water and ethanol extraction conditions reported here. Application of study results is discussed. 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. 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 1190-39-2

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

Liquid-crystalline symmetric triblock copolymers was written by Ivanov, M. G.;Boiko, N. I.;Chernikova, E. V.;Richardson, R.;Zhu, X.-M.;Shibaev, V. P.. And the article was included in Polymer Science, Series A in 2011.Safety of Benzyl benzodithioate This article mentions the following:

Sym. fully liquid-crystalline triblock copolymers of various structures containing optically active mesogenic groups are for the first time synthesized via pseudo-living radical reversible addition-fragmentation chain-transfer polymerization Their phase behavior and physicochem. and optical properties are studied. It is shown that, depending on composition, at low temperatures block copolymers can form at temperatures phase-separated structures caused by microsegregation of blocks of different chem. natures and that, with an increase in temperature, these structures can mix to form a cholesteric mesophase characterized by a helical supramol. structure. A model illustrating the mol. packing of block copolymers with a phase-separated lamellar structure is advanced. The effect of the mol. structure of the block copolymers on their optical properties is discussed. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7Safety of Benzyl benzodithioate).

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. 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.Safety of Benzyl benzodithioate

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

Oxidative dearomative cross-dehydrogenative coupling of indoles with diverse C-H nucleophiles: efficient approach to 2,2-disubstituted indolin-3-ones was written by Yan, Xue;Tang, Ying-De;Jiang, Cheng-Shi;Liu, Xigong;Zhang, Hua. And the article was included in Molecules in 2020.Product Details of 1190-39-2 This article mentions the following:

The oxidative, dearomative cross-dehydrogenative coupling of indoles with various C-H nucleophiles was developed. This process features a broad substrate scope with respect to both indoles and nucleophiles, affording structurally diverse 2,2-disubstituted indolin-3-ones in high yields (up to 99%). The oxidative dimerization and trimerization of indoles were demonstrated under the same conditions. 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. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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 1190-39-2

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

CO₂-expanded liquid assisted self-assembly between Disperse Red 1 and PS-b-P4VP was written by Cheng, Xiaomeng;Zheng, Xiaofang;Zhang, Yaolong;Li, Yu;Li, Hongping;Cao, Renfei;Li, Qianyu. And the article was included in RSC Advances in 2016.COA of Formula: C14H12S2 This article mentions the following:

This work shows that CO₂-expanded liquids (CXLs) facilitate the modulation of morphol. and photoluminescence (PL) performance of the self assembled fluorescent composite (SAFC), which was formed between Disperse Red 1 (DR1) and polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) in CO₂-expanded ethanol. We find that the anti-solvent effect of CXLs with increasing pressure could effectively regulate the amount and type of the hydrogen bonds with DR1 units as well as the confinement extent of DR1, along with the structure and fluorescence (FL) behavior of the SAFC. The morphol. and emission behavior of the SAFC was strongly dependent on the CXL pressure and the molar ratio (R) of 4VP to DR1. The SAFC emission revealed a non-monotonic feature against CXL pressure, which increased with a pressure rise below the threshold pressure (P_T) and then decreased at higher pressures above P_T. The maximum FL of SAFC at 5.58 MPa and R = 2800 was enhanced by 3.4-fold compared with that of the pristine mixture Confinement and hydrogen bonds are the two major factors responsible for the pressure dependence of the emission. Moreover, the hydrogen bonds formed between the DR1 and P4VP blocks are the principal contribution to SAFC emission than those between DR1 and ethanol. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7COA of Formula: C14H12S2).

Benzyl benzodithioate (cas: 27249-90-7) 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.COA of Formula: C14H12S2

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

Soluble and Columnar Liquid Crystalline Peropyrenequinones by Coupling of Phenalenones in Cesium Hydroxide was written by Buffet, Noemie;Grelet, Eric;Bock, Harald. And the article was included in Chemistry – A European Journal in 2010.Related Products of 10203-58-4 This article mentions the following:

The oxidative dimerization of 2-alkyl-3-hydroxy-1-phenalenones, the nitrogen-free carbon homologs of N-alkylnaphthalimides, was achieved using cesium hydroxide. This opens access to a new class of intensely long-wavelength absorbing perylenic dyes that adopt columnar liquid-crystalline structures at ambient temperature and that are obtained as separable pairs of centrosym. (transoid) and polar (cisoid) regioisomers. Their light absorption and mesomorphic properties make these compounds promising materials for organic opto-electronics. 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. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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.Related Products of 10203-58-4

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

Synthesis of rigid-rod linkers to anchor chromophores to semiconductor nanoparticles was written by Wang, Dong;Schlegel, James M.;Galoppini, Elena. And the article was included in Tetrahedron in 2002.SDS of cas: 313648-56-5 This article mentions the following:

Four rigid-rod sensitizers, made of a phenylethynyl spacer substituted with a chromophore and two COOR binding groups, were prepared to study dynamics of electron injection at the interface of metal oxide semiconductor nanoparticles. Di-Me Ru(bpy)₂((5-(5-1,10-phenanthrolinyl)ethynyl)isophthalate)²⁺, di-Me Ru(bpy)₂(5-(4-(2,2′-bipyridinyl)ethynyl)isophthalate)²⁺, di-Me 5-(1-pyrenylethynyl)isophthalate, and di-Me 5-(9-anthracenylethynyl)isophthalate were synthesized and characterized. Their absorption spectra, emission spectra, and electrochem. properties have been studied in acetonitrile and hexane solutions at room temperature In the experiment, the researchers used many compounds, for example, Dimethyl 5-ethynylisophthalate (cas: 313648-56-5SDS of cas: 313648-56-5).

Dimethyl 5-ethynylisophthalate (cas: 313648-56-5) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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.SDS of cas: 313648-56-5

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