Month: January 2023

A smart composite coating with photothermal response, anti-UV and anti-corrosion properties was written by Sun, Yue;Yuan, Sicheng;Fan, Weihao;Lin, Dan;Zhang, Kun;Bai, Ziheng;Zhu, Yanji;Wang, Huaiyuan. And the article was included in Chemical Engineering Journal (Amsterdam, Netherlands) in 2023.Product Details of 6683-19-8 This article mentions the following:

In order to obtain high corrosion protection coatings and break the bottleneck of epoxy (EP) in the loss of UV radiation mech. properties and phys. shielding, we report herein a smart composite coating approach. Ce ion-intercalated montmorillonite (M-Ce) provides reaction sites for 2-fluoroaniline polymerization (PFA), and their nanohybrids (PFAM-Ce) are used as effective additives to improve the anti-corrosion and anti-UV properties of EP coating. In terms of UV resistance mechanism, the free radical scavenging of PFAM-Ce conducted by the DPPH radical activity test. And UV absorption of PFAM-Ce is investigated by photometric system. Addnl., we found that the EP coating was loaded with 2 wt% PFAM-Ce, and the composite coating quickly achieved light-to-heat conversion. In contrast to conventional epoxy-based composites, the functionalized MMT based EP composites show a significant improvement in corrosion resistance under UV radiation, that is passing the 500-h weatherproof test (B-SUN-II) and 90-day 3.5 wt% NaCl immersion electrochem. testing. The results reveal that the uniformly dispersed PFAM-Ce in the fracture surface of the coating could provide the phys. shielding, anodic protection and cathodic inhibition on the steel substrates. This provides a new method for the enhancement of UV resistance of epoxy coatings and reveals the importance of functionalized polyaniline in anti-UV and anti-corrosion. 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 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. 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 6683-19-8

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

Hydrogenation of Alkyl Carboxylic Acids with Tetrahydropyrimidine-Derived Iridium Complexes under Mild Conditions was written by Lu, Sheng-Mei;Wang, Meng-Meng;Lin, Xiangfeng;Li, Can. And the article was included in ACS Catalysis in 2022.Product Details of 659-70-1 This article mentions the following:

Reported herein are competent iridium catalysts [Cp*Ir(N,N’)(H₂O)][OTf]₂ (N,N’ = three different 2,2′-bi-1,4,5,6-tetrahydropyrimidines) for application in the catalytic hydrogenation of a series of alkyl carboxylic acids under mild conditions (25-100°C) without any additives. Among these structurally diverse catalysts evaluated for reactivity, the complex bearing an electron-deficient ligand (N,N’ = 2,2′-bi-5,5′-hydroxyl-1,4,5,6-tetrahydropyrimidine) was the most robust, which can hydrogenate acetic acid smoothly at 25°C to give the alc. and ester products with a TON of 1106. Detailed mechanistic studies suggest that the generation of an [Ir-H] intermediate was involved in the rate-limiting step. With this catalyst system, a broad range of alkyl carboxylic acids were hydrogenated with moderate to high TONs. In the experiment, the researchers used many compounds, for example, Isopentyl 3-methylbutanoate (cas: 659-70-1Product Details of 659-70-1).

Isopentyl 3-methylbutanoate (cas: 659-70-1) 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. 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 659-70-1

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

Synthesis, characterization, reactivity, and catalytic studies of heterobimetallic vanadium(V) complexes containing hydrazone ligands was written by Kumar, Arvind;Kurbah, Sunshine D.;Syiemlieh, Ibanphylla;Dhanpat, Shobha A.;Borthakur, Rosmita;Lal, Ram A.. And the article was included in Inorganica Chimica Acta in 2021.Recommanded Product: Ethyl 2-hydroxybenzoate This article mentions the following:

Six heterobimetallic alkali metal dioxidovanadium(V) coordination polymer complexes {[M₆{VO(μ-O)}₂(μ-OH)₄(μ₄-slox/nph)].n DMF}_{âˆ?/sub> where M = Na, K, and Cs; n = 1 for (1), 0 for (2)-(6) of two dihydrazone ligands, disalicylaldehydeoxaloyldihydrazone (H4slox) and bis(2-hydroxy-1-naphthaldehyde)oxaloyldihydrazone (H4nph) are reported. All the complexes were characterized by various physicochem. techniques such as elemental analyses, molar conductance, IR, NMR, UV-visible, and cyclic voltammetry. The IR, ¹HNMR, and ¹³CNMR spectral data suggest that the dihydrazones are coordinated through phenolate/naphtholate oxygen, enolate oxygen, and azine nitrogen atoms to the metal centers. The structure of {[Na6{VO(μ-O)}2(μ-OH)4(μ4-slox)].DMF}âˆ?/sub> (1) is also determined by single-crystal x-ray data, which revealed that the H4slox coordinated via all possible dative sites to metal centers as tetrabasic octadentate ligand. The vanadium metal centers adopted distorted square-pyramidal coordination geometries, and the sodium atoms are also in five coordination atms. The electronic spectra of the complexes showed LMCT bands in addition to intra-ligand π â†?π^* and n â†?π^* transitions. As evident from the cyclic voltammetry, the complexes showed two metal-centered electron transfer reactions [(V^VV^V(slox)^2-)/V^VV^IV(slox)^3-] and [(V^VV^IV(slox)^3-)/V^VV^IV(slox)^4-], in addition to the ligand centered electron transfer reactions. Further, bovine serum albumin (BSA) interaction studies of {[Na6{VO(μ-O)}2(μ-OH)4(μ4-slox)].DMF}âˆ?/sub> (1) and [Na6{VO(μ-O)}2(μ-OH)4(μ4-nph)]âˆ?/sub> (4) revealed strong binding affinity. Also, the catalytic studies of 1 and 4 are effective for the oxidation of alcs. into their corresponding aldehydes and ketones and bromination of some organic substrates in the presence of H2O2 as an oxidizing agent. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Recommanded Product: Ethyl 2-hydroxybenzoate).}

Ethyl 2-hydroxybenzoate (cas: 118-61-6) 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. 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.Recommanded Product: Ethyl 2-hydroxybenzoate

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

Domino Prins Cyclization of Enynols: Stereoselective Synthesis of Bicyclic Vinyl Fluorides was written by Venkateswarlu, Anipireddy;Kanakaraju, Marumudi;Kunwar, Ajit C.;Rami Reddy, Yellala V.;Reddy, Basi V. S.. And the article was included in European Journal of Organic Chemistry in 2015.HPLC of Formula: 17920-23-9 This article mentions the following:

A fluoride-induced termination of Prins cyclization was observed using a tethered alkyne and stoichiometric amounts of AgSbF₆ and found to generate a novel series of 6-fluoro-1-aryl-hexahydro-1H-isochromene derivatives in good yields with excellent selectivity. This was the first report of the synthesis of fluoro-substituted oxabicycles. In this tandem process, three reactions occurred in one-pot to leading to installation of three contiguous stereocenters. In the experiment, the researchers used many compounds, for example, Diethyl 2-(prop-2-yn-1-yl)malonate (cas: 17920-23-9HPLC of Formula: 17920-23-9).

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

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

Iodine-catalysed sp³ C-H sulfonylation to form β-dicarbonyl sulfones with sodium sulfinates was written by Gao, Wen-Chao;Zhao, Jin-Jin;Chang, Hong-Hong;Li, Xing;Liu, Qiang;Wei, Wen-Long. And the article was included in RSC Advances in 2014.COA of Formula: C9H10O3S This article mentions the following:

An efficient and easily handled method for β-dicarbonyl sulfones with sodium sulfinates as the sulfonyl source was developed. This transformation was involved in the iodine-catalyzed sp³ C-H sulfonylation of β-dicarbonyl compounds In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8COA of Formula: C9H10O3S).

Ethyl 3-oxo-3-(thiophen-2-yl)propanoate (cas: 13669-10-8) 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. 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: C9H10O3S

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

Palladium-catalyzed arylation of diisopropyl malonate applied to the efficient synthesis of the selective MMP inhibitor 5-(4-phenoxyphenyl)-5-[4-(2-pyrimidinyl)-1-piperazinyl]barbituric acid was written by Hutchings, Stanley;Liu, Wen;Radinov, Roumen. And the article was included in Heterocycles in 2006.Electric Literature of C11H20O4 This article mentions the following:

An efficient synthesis of the highly selective MMP inhibitor 5-(4-phenoxyphenyl)-5-(4-pyrimidin-2-ylpiperazin-1-yl)barbituric acid is reported. The title compound was prepared in three steps and 72% overall yield from 4-bromophenyl Ph ether via an improved arylation of diisopropyl malonate. In the experiment, the researchers used many compounds, for example, malonic acid dibutyl ester (cas: 1190-39-2Electric Literature of C11H20O4).

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. 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.Electric Literature of C11H20O4

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

Bioactivity assessment of essential oils of Cymbopogon species using a network pharmacology approach was written by Bansal, Hina;Pravallika, Vusala Sri Sai;Srivastava, Gauri;Ganjewala, Deepak. And the article was included in Biologia Futura in 2022.Quality Control of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate This article mentions the following:

Essential oils of Cymbopogon species have wide com. applications in fragrance, perfumery, and pharmaceuticals as they exhibit a horizon of bioactivities. Here, essential oils of C. flexuosus and C. martinii were analyzed to identify bioactive constituents and bioactivities using a network pharmacol. approach. Essential oils were isolated using hydro-distillation in a mini Clevenger apparatus Anal. of essential oils by GC-MS revealed 20 and 15 chem. constituents in C. flexuosus and C. martinii, resp. An ingredient-target protein-pathway network was constructed comprising 10 oil constituents (citral, geraniol, geranyl acetate, limonene, linalool, α-terpineol, borneol, a-pinene, myrcene, and n-decanol), 14 target proteins, 51 related pathways, and 108 connections. Analyses of the network showed geraniol, geranyl acetate, limonene, linalool, and citral as major active constituents. A core sub-network constructed from the ingredient-target protein-pathway network revealed bioactivities including anti-cancer, anti-inflammatory and neuroprotective. The protein association network pointed out the major target proteins viz., THRB, FXR, ALOX15, and TSHR and pathways like metabolic, and neuroactive ligand-receptor interaction pathways of essential oil constituents. The target proteins and pathways provided insights into the mechanism of action of bioactive constituents. Based on the results of the study, geraniol was correlated with neuroprotective, citral to chemo-preventive, and limonene to anti-inflammatory activities. Thus, the study offers a new way for the assessment of the bioactivities of Cymbopogon species essential oils leading to the development of new biomedicines. In the experiment, the researchers used many compounds, for example, (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3Quality Control of (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate).

(E)-3,7-Dimethylocta-2,6-dien-1-yl acetate (cas: 105-87-3) 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 (E)-3,7-Dimethylocta-2,6-dien-1-yl acetate

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

Construction of Bridged Aza- and Oxa-[n.2.1] Skeletons via an Intramolecular Formal [3 + 2] Cycloaddition of Aziridines and Epoxides with Electron-deficient Alkenes was written by Xing, Siyang;Wang, Yuhan;Jin, Changkun;Shi, Shaochen;Zhang, Yihui;Liao, Ziya;Wang, Kui;Zhu, Bolin. And the article was included in Journal of Organic Chemistry in 2022.Quality Control of malonic acid dibutyl ester This article mentions the following:

An intramol. formal [3+2] cycloaddition of activated aziridines and epoxides with electron-deficient alkene I (X = N,O; R¹ = Me, Et, n-Pr, i-Pr, n-bu, Bn; R³ = H, F, Cl; R⁴ = H, OMe, CF₃; R⁵ = H, Me; R² = 4-Br₆H₄, 4-NO₂C₆H₄, C₆H₅) has been developed for the general and efficient construction of bridged aza- and oxa-[n.2.1] (n = 3,4) II skeletons. The strategy can be promoted by lithium iodide efficiently. In order to demonstrate its potential, the intramol. formal [3 + 2] cycloaddition was used to access the important intermediate of homoepiboxidine. 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 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. 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.Quality Control of malonic acid dibutyl ester

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

Synthesis of functionalized S-benzyl dithiocarbamates from diazo-compounds via multi-component reactions with carbon disulfide and secondary amines was written by Kumar, Nitin;Venkatesh, Rapelly;Kandasamy, Jeyakumar. And the article was included in Organic & Biomolecular Chemistry in 2022.Recommanded Product: 584-74-7 This article mentions the following:

Triflic acid promoted multi-component synthesis of functionalized S-benzyl dithiocarbamates R¹CH(C(O)R²)(SC(S)NR³R⁴) [R¹ = Ph, 2-fluorophenyl, 4-methylphenyl, etc.; R² = OEt, OMe, Oi-Pr, Ot-Bu, cyclohexyloxy; R³ = H, Et, Pr, hexyl; R⁴ = Et, Pr, Bu, hexyl, benzylmethyl; R³R⁴ = -(CH₂)₄-, -(CH₂)₅-, -(CH₂)₂O(CH₂)₂-, -(CH₂)₂S(CH₂)₂-, -(CH₂)₂N(Me)(CH₂)₂-] from diazo compounds R¹C(=N₂)C(O)R², carbon disulfide and secondary amines R³R⁴NH is reported. The reactions proceeded at room temperature and gave the desired S-benzyl dithiocarbamates in good yields. Wide-substrate scope and easy operation are the important features of this methodol. In the experiment, the researchers used many compounds, for example, Ethyl 2-fluorophenylacetate (cas: 584-74-7Recommanded Product: 584-74-7).

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. 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: 584-74-7

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

Identification of volatile and odor-active compounds in Hunan black tea by SPME/GC-MS and multivariate analysis was written by Yin, Xia;Huang, Jian’an;Huang, Jing;Wu, Wenliang;Tong, Tong;Liu, Shujuan;Zhou, Lingyun;Liu, Zhonghua;Zhang, Shuguang. And the article was included in LWT–Food Science and Technology in 2022.Recommanded Product: Ethyl 2-hydroxybenzoate This article mentions the following:

Hunan black tea is well-known for its floral-honey aroma, but the volatile components responsible for the fragrance have not been elucidated yet. In this study, the volatile compounds in Hunan black tea were identified and quantified by the headspace solid-phase microextraction coupled with gas chromatog.-mass spectrometry (HS-SPME-GC-MS). The results showed that 88 compounds were extracted and determined in Hunan black tea, including the dominant components Geraniol, phenethyl alc., phenylacetaldehyde, linalool, nonanal and other 5 aromatic compounds Furthermore, the aroma-active compounds were identified by odor activity value (OAV). It was found that 24 aroma compounds, including geraniol with an OAV� were regarded as the primary active aromatic compounds in Hunan black tea. Finally, partial least squares (PLS) regression anal. was employed and results revealed that Nonanal, trans-nerolidol, benzyl alc., and phenylethanol exhibit a pos. correlation with the intensity of floral and sweet honey aromas. Overall, this study identified the volatile compounds responsible for the dominant floral-honey aroma in Hunan black tea. In the experiment, the researchers used many compounds, for example, Ethyl 2-hydroxybenzoate (cas: 118-61-6Recommanded Product: Ethyl 2-hydroxybenzoate).

Ethyl 2-hydroxybenzoate (cas: 118-61-6) 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. 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: Ethyl 2-hydroxybenzoate

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