Month: January 2023

Effect of char-forming agents rich in tertiary carbon on flame retardant properties of polypropylene was written by Tian, Xiao-Shuang;Zhang, Yue-Fei;Li, Yan;Zhong, Jin-Rong. And the article was included in Journal of Thermal Analysis and Calorimetry in 2022.Product Details of 6683-19-8 This article mentions the following:

In this research, a novel type of triazine-based char-forming agent (PTPA) was synthesized and combined with ammonium polyphosphate (APP) to form an intumescent flame retardant (IFR) system to prevent polypropylene (PP) burning. A commercialized char-forming agent was purchased and the same process was used to study its flame retardant performance on polypropylene, and the results were compared with those of this experiment It was found that the PP/IFR samples in this experiment (APP/PTPA = 4/1-1/1) reached the increased limiting oxygen index (LOI) value of 29.5%, and passed the vertical combustion (UL-94) V-0 rating. The maximum LOI for the purchase of char-forming agent is 31.0%. Thermogravimetric anal. results show that the PTPA/APP system can improve the thermal stability and thermal oxidation stability of carbon slag. The carbon residue was further studied by visual observation and SEM. The dense coke residues formed hinder the transfer of gas and heat during the combustion process, and ultimately endow the PP/IFR system with higher flame retardancy. In the experiment, the researchers used many compounds, for example, 2,2-Bis(((3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl)oxy)methyl)propane-1,3-diyl bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate) (cas: 6683-19-8Product Details of 6683-19-8).

2,2-Bis(((3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoyl)oxy)methyl)propane-1,3-diyl bis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate) (cas: 6683-19-8) 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. 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 6683-19-8

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

Exploring Plant Performance, Fruit Physicochemical Characteristics, Volatile Profiles, and Sensory Properties of Day-Neutral and Short-Day Strawberry Cultivars Grown in Texas was written by Scott, Gabrielle;Williams, Cierra;Wallace, Russell W.;Du, Xiaofen. And the article was included in Journal of Agricultural and Food Chemistry in 2021.Application of 706-14-9 This article mentions the following:

To assist increasing annual acreage of Texas-grown (U.S.A.) strawberries, it is essential to select cultivars with excellent plant and fruit quality characteristics suitable to the diverse environments. This study assessed multiple traits of 10 strawberry cultivars grown under high tunnels. A significant difference (p â‰?0.05) was observed for all traits, which possessed a wide variability of metabolites. Plant anal. (number of live plants, plant vigor, and harvest yield) indicated that the yield ranged from 226 to 431 g/plant, pos. correlated to plant vigor. Fruit physicochem. characteristic anal., including red color (absorbance at 500 nm) and taste-associated indicators [°Brix, titratable acidity (TA), and total soluble solids (TSS)/TA], showed that °Brix and TSS/TA ranged from 8.0 to 12.9 and from 9.1 to 15.3, resp. More than 300 volatiles were identified using solid-phase microextraction-gas chromatog.-mass spectrometry, and total volatiles varied 1.5 times with high variance of individual compounds between cultivars. Descriptive sensory anal. indicated that strawberry flavor was pos. associated with sensory attributes of sweetness, jammy, fruity, buttery, fresh, and creamy while neg. related to bitterness, astringency, and sourness. Partial least squares regression indicated that strawberry flavor was highly correlated with sweet taste and volatile composition No specific relationship between these traits and day-neutral or June-bearing varieties was identified. Ideal cultivars for Texas growing conditions with superior and balanced flavor qualities were Albion, Sweet Charlie, Camarosa, Camino Real, and Chandler. In the experiment, the researchers used many compounds, for example, 5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9Application of 706-14-9).

5-Hexyldihydrofuran-2(3H)-one (cas: 706-14-9) 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. Esters are more polar than ethers but less polar than alcohols. They participate in hydrogen bonds as hydrogen-bond acceptors, but cannot act as hydrogen-bond donors, unlike their parent alcohols. This ability to participate in hydrogen bonding confers some water-solubility.Application of 706-14-9

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

Sulfonyl-phenyl-ureido benzamidines a novel structural class of potent antimalarial agents was written by Leban, Johann;Pegoraro, Stefano;Dormeyer, Matthias;Lanzer, Michael;Aschenbrenner, Andrea;Kramer, Bernd. And the article was included in Bioorganic & Medicinal Chemistry Letters in 2004.Application of 16413-26-6 This article mentions the following:

The high throughput in silico screening of a virtual library into the structure of the P. falciparum lactate dehydrogenase (LDH) with the 4SCan technol. yielded a series of biphenyl urea compounds These were chem. optimized to a new structural class of potent antimalarial agents. The compounds did not inhibit plasmodium LDH enough to fully explain their potency. Therefore we conclude that an unknown mode of action may be the cause of the antimalarial activity. In the experiment, the researchers used many compounds, for example, 3-Cyanophenylisocyanate (cas: 16413-26-6Application of 16413-26-6).

3-Cyanophenylisocyanate (cas: 16413-26-6) 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. Application of 16413-26-6

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

Aroma composition of fruit wines. II. Bilberry wine was written by Schreier, P.;Drawert, F.. And the article was included in Chemie, Mikrobiologie, Technologie der Lebensmittel in 1982.COA of Formula: C11H14O3 This article mentions the following:

The volatile components of 2 laboratory-made and 4 com. bilberry wines were separated by liquid-liquid extraction and investigated by column chromatog. on silica gel, gas chromatog. and combined gas chromatog.-mass spectrometry. Of the aroma components, 43 compounds were identified, including, among them furfural  [98-01-1], 5-methylfurfural  [620-02-0], and Et 4-oxopentanoate  [539-88-8], in some com. samples made from juice concentrates The occurrence of 3-methylbutanoate  [503-74-2] and Et 2- [7452-79-1] and 3-methylbutanoates [108-64-5] in a com. sample, together with a large amount of benzyl alc.  [100-51-6] suggests unlawful addition of flavorings during processing. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0COA of Formula: C11H14O3).

Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0) 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.COA of Formula: C11H14O3

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

Phenylhydrazide as an enzyme-labile protecting group in peptide synthesis was written by Voelkert, Martin;Koul, Surrinder;Mueller, Gernot H.;Lehnig, Manfred;Waldmann, Herbert. And the article was included in Journal of Organic Chemistry in 2002.Quality Control of Ethyl 2-hydroxy-3-phenylpropanoate This article mentions the following:

The enzymic cleavage of amino acid phenylhydrazides with the enzyme tyrosinase (EC 1.14.18.1) offers a new, mild, and selective method for C-terminal deprotection of peptides. The advantages of the described methodol. are the very mild oxidative removal of the protecting group at room temperature and pH 7, a high chemo- and regioselectivity, and the availability of the biocatalyst. Even in oxygen-saturated solution, the oxidation of sensitive methionine residues was not observed These features make the methodol. suitable for the synthesis of sensitive peptide conjugates. Mechanistic data suggest that the hydrolysis of the oxidized adducts proceeds by a free-radical mechanism. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0Quality Control of Ethyl 2-hydroxy-3-phenylpropanoate).

Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0) 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. 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 Ethyl 2-hydroxy-3-phenylpropanoate

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

Regioregularity and Electron Deficiency Control of Unsymmetric Diketopyrrolopyrrole Copolymers for Organic Photovoltaics was written by Aoshima, Kenta;Nomura, Mayuka;Saeki, Akinori. And the article was included in ACS Omega in 2019.Safety of Ethyl 3-oxo-3-(thiophen-2-yl)propanoate This article mentions the following:

Manipulating the electron deficiency and controlling the regioregularity of π-conjugated polymers are important for the fine-tuning of their electronic and electrochem. properties to make them suitable for an organic solar cell. Here, we report such a mol. design of unsym. diketopyrrolopyrrole (DPP) based copolymers with different aromatic side units of either thiophene (Th), pyridine (Py), or fluorobenzene (FBz). The unsym. electron acceptors of Th-DPP-Py and Th-DPP-FBz were polymerized with the electron donor of two-dimensional benzobisthiophene (BDT-Th), affording two regiorandom DPP copolymers. They exhibited contrasting MO levels and bulk heterojunction morphol. in methanofullerene-blended films, leading to power conversion efficiencies of 3.75 and 0.18%, resp. We further synthesized a regioregular DPP copolymer via sandwiching the centrosym. BDT-Th unit by two Th-DPP-Py units in an axisym. manner. The extensive characterization through morphol. observation, X-ray diffraction, and space-charge-limited current mobilities highlight the case-dependent pos./neg. effects of regioregularity and electron deficiency control. 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 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. 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 Ethyl 3-oxo-3-(thiophen-2-yl)propanoate

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

Enantioselective Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones through Organocatalytic Transfer Hydrogenation of 2-Hydroxypyrimidines was written by Meng, Fan-Jie;Shi, Lei;Feng, Guang-Shou;Sun, Lei;Zhou, Yong-Gui. And the article was included in Journal of Organic Chemistry in 2019.Quality Control of Ethyl 3-oxo-3-(m-tolyl)propanoate This article mentions the following:

Chiral phosphoric acid-catalyzed transfer hydrogenation of 2-hydroxypyrimidines has been successfully realized using Hantzsch ester or dihydrophenanthridine as the hydrogen source, furnishing the chiral 3,4-dihydropyrimidin-2(1H)-ones (DHPMs) with excellent yields and enantioselectivities of �9%. Notably, a novel kind of chiral DHPMs with an alkyl stereogenic center can be prepared through highly chemoselective transfer hydrogenation. 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 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. 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 Ethyl 3-oxo-3-(m-tolyl)propanoate

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

Rhodium(III)-catalyzed sulfonamide directed ortho C-H carbenoid functionalization via metal carbene migratory insertion was written by Dong, Yi;Chen, Jiajing;Xu, Heng. And the article was included in Chemical Communications (Cambridge, United Kingdom) in 2019.Application In Synthesis of Methyl 2-(methylsulfonyl)acetate This article mentions the following:

A rhodium(III)-catalyzed sulfonamide directed ortho C-H carbenoid functionalization was developed with good yields. This method was attractive due to its broad substrate scope and enabled derivation of diverse biol. active sulfonamide structures and late-stage modification of sulfa drugs. In the experiment, the researchers used many compounds, for example, Methyl 2-(methylsulfonyl)acetate (cas: 62020-09-1Application In Synthesis of Methyl 2-(methylsulfonyl)acetate).

Methyl 2-(methylsulfonyl)acetate (cas: 62020-09-1) 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 Methyl 2-(methylsulfonyl)acetate

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

Highly efficient asymmetric michael addition reaction of malonates to α,β-unsaturated ketones promoted by a chiral thiourea/PPY dual-catalyst system was written by Moritaka, Maya;Miyamae, Naomu;Nakano, Keiji;Ichikawa, Yoshiyasu;Kotsuki, Hiyoshizo. And the article was included in Synlett in 2012.Formula: C10H14O4 This article mentions the following:

The enantioselective Michael addition reaction of malonates to α,β-unsaturated ketones is efficiently promoted by a combined dual-catalyst system composed of chiral thiourea and 4-pyrrolidinopyridine (PPY) in toluene. The expected Michael adducts with cyclic and acyclic enones are obtained in excellent yields and with excellent enantioselectivities. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9Formula: C10H14O4).

Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9) 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. 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.Formula: C10H14O4

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

Analysis of aromatic compounds in sauce-flavor Moutai lees by GC-MS was written by Zhang, Shixian;Jin, Qian;Zeng, Qihua;Gao, Zhixi. And the article was included in Zhongguo Niangzao in 2012.SDS of cas: 15399-05-0 This article mentions the following:

Aromatic compounds of Moutai lees were extracted by steam distillation and isolated by gas chromatog.-mass spectrometry. Thirty-two kinds of ingredients were identified, including furfural, Et linoleate, Et palmitate, Et oleate, 5-methyl-2-furfural, phenethyl alc., 2-formylpyrrole, benzaldehyde, hyacinthin, 2-acetylfuran, furfuralc., 2,3,5,6-tetra-Me pyrazine, Et 9-hexadecanoate, ethyl-2-hydroxy-3-phenylpropanoate, Et stearate, 3-acetylpyrrole and phytane, etc. They were main components of the sauce-flavor Moutai lees, counted for up to 93.9%. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0SDS of cas: 15399-05-0).

Ethyl 2-hydroxy-3-phenylpropanoate (cas: 15399-05-0) 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. 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. SDS of cas: 15399-05-0

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