Month: February 2023

Assessing the volatile profile of carob tree (Ceratonia siliqua L.) was written by Krokou, Andriana;Stylianou, Marinos;Agapiou, Agapios. And the article was included in Environmental Science and Pollution Research in 2019.Related Products of 868-57-5 This article mentions the following:

Biogenic volatile organic compounds (VOCs) contribute to the communication, growth, breeding, and defense of plant; their role in plant kingdom is vital. Carob tree is cultivated mainly in Middle East and eastern European countries (e.g., Spain, Italy, Greece, Cyprus) and lately in Australia, the USA, and South Africa. Therefore, it is examined as a case study for its volatile emissions in the environment. Apart from the VOCs emitted from carob flowers and fruit, carob is considered of great interest for the food industry (carob powder), not only for its health benefits but also due to its characteristic strong aroma, which can be maintained even after processing (roasting). Solid-phase microextraction/gas chromatog.-mass spectrometry (SPME/GC-MS) analyses of carob flowers, fruit, and powder (com. samples) were performed and the detected VOCs are presented and discussed. The most prominent chem. classes emitted from carob fruit and powder appeared to be acids followed by esters and aldehydes/ketones, whereas from carob flowers the terpenoids. The strongest VOCs both in carob fruits and powder were propanoic acid, 2-Me (isobutyric acid) and in flowers ethanol. The uniqueness of carob benefits is well known in the agriculture, pharmaceutical, cosmetic, and food sector and is closely related to the agro-economy and long history of eastern Mediterranean countries. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Related Products of 868-57-5).

Methyl2-methylbutyrate (cas: 868-57-5) 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. 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 868-57-5

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

Synthesis of aromatic azomethines from anesthesin and derivatives of vanillin and vanillal was written by Dikusar, E. A.;Potkin, V. I.;Kozlov, N. G.;Yuvchenko, A. P.. And the article was included in Vestsi Natsyyanal’nai Akademii Navuk Belarusi, Seryya Khimichnykh Navuk in 2007.Formula: C12H14O4 This article mentions the following:

Novel aromatic azomethines 3-R¹O-4-R²OC₆H₃CH:NR³ (R¹ = Me, Et; R² = H, COMe, PhCH₂CO, BrCH₂CO, PhCO, etc.; R³ = 4-EtO₂CC₆H₄), containing ether and ester groups from vanillin, vanillal and their esters, were synthesized in 90-94% yields by condensation of the corresponding aldehydes 3-R¹O-4-R²OC₆H₃CHO with Et 4-aminobenzoate at reflux in absolute methanol in the absence of any catalyst. In the experiment, the researchers used many compounds, for example, 4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4Formula: C12H14O4).

4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4) 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.Formula: C12H14O4

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

One-pot synthesis of 5-alkylthio-3H-1,2-dithiole-3-thiones: advantages and scopes was written by Aimar, Mario L.;De Rossi, Rita H.. And the article was included in Synthesis in 2000.Application of 1190-39-2 This article mentions the following:

The reaction of dialkyl malonate esters, ROCOCHR¹CO₂R [R = H, Me, Et, Pr, i-Pr, Ph, Bu, hexyl, octyl, decyl, benzyl, 2-ethoxyethyl, R¹ = H; R = Et, R¹ = Me, benzyl, Ph, Cl, OMe, Br, Br₂, NO₂], with P₂S₅/S₈ in boiling xylene in the presence of 2-mercaptobenzothiazole/ZnO as catalyst produced the corresponding 5-alkylthio-3H-1,2-dithiole-3-thiones I as major identifiable product. Moderate yields were obtained with malonate esters of primary alcs. The reaction failed with malonate esters of secondary alcs. Regarding the substituent in position two, dialkyl malonates with groups such as CH₃, Ph, CH₂Ph, OCH₃ and Cl afford the corresponding 4-substituted derivatives whereas with Br and NO₂ did not give the expected products. Some mechanistic evidences were described. 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 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 of 1190-39-2

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

Regio/Stereoselective Glycosylation of Diol and Polyol Acceptors in Efficient Synthesis of Neu5Ac-α-2,3-LacNPhth Trisaccharide was written by Zhang, Ying;Zhao, Fu-Long;Luo, Tao;Pei, Zhichao;Dong, Hai. And the article was included in Chemistry – An Asian Journal in 2019.Name: (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate This article mentions the following:

A concise approach to a Neu5Ac-α-2,3-LacNPhth trisaccharide derivative was developed. First, the regio/stereoselective glycosylation between glycoside donors and glucoNPhth diol acceptors was investigated. It was found that the regioselectivity depends not only on the steric hindrance of the C2-NPhth group and the C6-OH protecting group of the glucosamine acceptors, but also on the leaving group and protecting group of the glycoside donors. Under optimized conditions, LacNPhth derivatives were synthesized in up to 92 % yield through a regio/stereoselective glycosylation between peracetylated-α-galactopyranosyl trichloroacetimidate and p-methoxyphenyl 6-O-tert-butyldiphenylsilyl-2-deoxy-2-phthalimido-β-D-glucopyranoside, avoiding the formation of glycosylated orthoesters and anomeric aglycon transfer. Then, the LacNPhth derivative was deacylated and then protected on the primary position by TBDPS to form a LacNPhth polyol acceptor. Finally, the Neu5Ac-α-2,3-LacNPhth derivative was synthesized in 48 % yield through the regio/stereoselective glycosylation between the LacNPhth polyol acceptor and a sialyl phosphite donor. Starting from D-glucosamine hydrochloride, the target Neu5Ac-α-2,3-LacNPhth derivative was synthesized in a total yield of 18.5 % over only 10 steps. In the experiment, the researchers used many compounds, for example, (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4Name: (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate).

(2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate (cas: 4163-60-4) 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. Name: (2S,3R,4S,5S,6R)-6-(Acetoxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetraacetate

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

Modular click chemistry libraries for functional screens using a diazotizing reagent was written by Meng, Genyi;Guo, Taijie;Ma, Tiancheng;Zhang, Jiong;Shen, Yucheng;Sharpless, Karl Barry;Dong, Jiajia. And the article was included in Nature (London, United Kingdom) in 2019.Quality Control of Methyl 4-aminobicyclo[2.2.2]octane-1-carboxylate This article mentions the following:

Alkyl and aryl azides were prepared from the corresponding primary alkyl and aryl amines by reaction with fluorosulfonyl azide generated in situ from a fluorosulfonylimidazolium triflate and sodium azide, expanding access to azides and both to the 1,2,3-triazoles derived from them and to functional screens employing them. The method allowed the preparation of a library of >1000 azides from the corresponding amines; the azide library underwent copper-catalyzed azide-alkyne cycloaddition reactions to yield a library of >1000 1,2,3-triazoles. In the experiment, the researchers used many compounds, for example, Methyl 4-aminobicyclo[2.2.2]octane-1-carboxylate (cas: 135908-33-7Quality Control of Methyl 4-aminobicyclo[2.2.2]octane-1-carboxylate).

Methyl 4-aminobicyclo[2.2.2]octane-1-carboxylate (cas: 135908-33-7) 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, 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. Quality Control of Methyl 4-aminobicyclo[2.2.2]octane-1-carboxylate

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

Development of a nano-modified glassy carbon electrode for the determination of 2,6-diaminotoluene (TDA) was written by Buyuktas, Duygu;Ghaani, Masoud;Rovera, Cesare;Olsson, Richard T.;Korel, Figen;Farris, Stefano. And the article was included in Food Packaging and Shelf Life in 2021.SDS of cas: 6683-19-8 This article mentions the following:

The objective of this study was to improve the overall performance of a glassy carbon electrode (GCE) for the detection of 2,6-diaminotoluene (TDA), a possibly carcinogenic primary aromatic amines (PAAs) that poses a serious risk for the consumer′ health because they can transfer from multilayer food packages including adhesives based on aromatic polyurethane (PU) systems, to the food. The modification of the electrode surface was made by means of multi-walled carbon nanotubes (MWCNTs) and mesoporous carbon nanoparticles (MCNs). The MWCNTs-MCNs/GCE allowed achieving the best performance in terms of sensitivity, as revealed by cyclic voltammetry – CV, with an oxidation peak of 20.95 μA over 0.079 μA of the bare GCE. The pH of the medium influenced the oxidation of 2,6-TDA, with highest sensitivity at pH ∼7. Amperometry experiments led to an estimated detection limit of 0.129 μM, and three linear ranges were obtained for 2,6-TDA: 0.53-11.37 μM, 11.37-229.36 μM, and 229.36-2326.60 μM. Chronoamperometry experiments combined with Cottrell′s theory allowed estimating a diffusion coefficient of 2,6-TDA of 1.34 x 10^-4 cm²s^-1. The number of electrons (n∼1) involved in the catalytic oxidation of 2,6-TDA was determined according to the Laviron′s theory. Real sample tests demonstrated that the modification of the sensor using nanoparticls allowed to obtain a highly sensitive and selective sensor, which can possibly used as an alternative anal. device for the rapid, easy, and reliable determination of 2,6-TDA. 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: 6683-19-8SDS of cas: 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. 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: 6683-19-8

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

Multivariate Statistical Analysis and Odor-Taste Network To Reveal Odor-Taste Associations was written by Guichard, Elisabeth;Barba, Carmen;Thomas-Danguin, Thierry;Tromelin, Anne. And the article was included in Journal of Agricultural and Food Chemistry in 2020.Quality Control of Methyl2-methylbutyrate This article mentions the following:

Odor-taste association has been successfully applied to enhance taste perception in foods with low sugar or low salt content. Nevertheless, selecting odor descriptors with a given associated taste remains a challenge. In the aim to look for odors able to enhance some specific taste, we tested different multivariate analyses to find links between taste descriptors and odor descriptors, starting from a set of data previously obtained using gas chromatog./olfactometry-associated taste: 68 odorant zones described with 41 odor descriptors and 4 taste-associated descriptors (sweetness, saltiness, bitterness, and sourness). A partial least square anal. allowed for identification of odors associated with a specific taste. For instance, odors described as either fruity, sweet, strawberry, candy, floral, or orange are associated with sweetness, while odors described as either toasted, potato, sulfur, or mushroom are associated with saltiness. A network representation allowed for visualization of the links between odor and taste descriptors. As an example, a pos. association was found between butter odor and both saltiness and sweetness. Our approach provided a visualization tool of the links between odor and taste description and could be used to select odor-active mols. with a potential taste enhancement effect based on their odor descriptors. In the experiment, the researchers used many compounds, for example, Methyl2-methylbutyrate (cas: 868-57-5Quality Control of Methyl2-methylbutyrate).

Methyl2-methylbutyrate (cas: 868-57-5) 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.Quality Control of Methyl2-methylbutyrate

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

Pelletizing ultra-high molecular weight polyethylene (UHMWPE) powders with a novel tapered die and addition of high density polyethylene (HDPE): Processing, morphology, and properties was written by Yang, Huaguang;Yilmaz, Galip;Jiang, Jing;Xie, Jun;Langstraat, Thomas;Chu, Raymond;van Es, Martin;Garg, Priya;Turng, Lih-Sheng. And the article was included in Polymer in 2022.Related Products of 6683-19-8 This article mentions the following:

The extremely high mol. weight and mol. entanglement have rendered ultra-high mol. weight polyethylene (UHMWPE) superior properties. However, poor inter-particle diffusion makes it difficult to pelletize UHMWPE powders for easy processing/handling. A novel tapered die with air cooling was proposed to pelletize UHMWPE and a UHMWPE blend with 5 weight% high-d. polyethylene (HDPE) for compression molding and material characterization. The tensile strength of samples prepared with the tapered die outperformed those by the regular die or from virgin powders. The addition of HDPE further improved the tensile strength. Fourier transform IR spectroscopy (FTIR) revealed little chain scission and the lowest amount of oxidation from the tapered die. Intrinsic viscosity (IV) measurements confirmed the negligible chain scission and showed an increment in IV for the UHMWPE/HDPE blend. Multi-angle light scattering with size-exclusion chromatog. (SEC-MALS) indicated no change in the UHMWPE mol. weight distribution, but some crosslinking in the blend. Polarized optical microscopy (POM) showed that the HDPE and extrusion led to a finer UHMWPE domain size and better fusion between UHMWPE and HDPE. The combined effect of enhanced mol. chain diffusion, improved consolidation, and lower oxidation using the tapered die led to 40% improvement of tensile strength for the UHMWPE/HDPE blend. 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: 6683-19-8Related Products 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. 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.Related Products of 6683-19-8

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

Vanillin Alkanoates in the Synthesis of Hexahydrobenzacridine and Octahydroxanthene Derivatives was written by Kozlov, N. G.;Basalaeva, L. I.. And the article was included in Russian Journal of General Chemistry in 2005.COA of Formula: C12H14O4 This article mentions the following:

Cascade heterocyclization of 1,3-cyclohexanedione and dimedone with 2-naphthylamine and vanillin esters gave 2-methoxy-4-(alkyl-11-oxo-7,8,9,10,11,12-hexahydrobenz[a]acridin-12-yl)- and 2-methoxy-4-(alkyl-1,8-dioxo-2,3,4,5,6,7,8,9-octahydro-1H-xanthen-9-yl)phenyl esters of aliphatic (C₁-C₄) carboxylic acids. In the experiment, the researchers used many compounds, for example, 4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4COA of Formula: C12H14O4).

4-Formyl-2-methoxyphenyl isobutyrate (cas: 20665-85-4) 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. COA of Formula: C12H14O4

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

Preparation of porous materials by amphiphilic block copolymer polystyrene-block-poly (vinyl pyrrolidone) self-assembly was written by Li, Ying;Han, Han;Yuan, Jinfang. And the article was included in Gongneng Cailiao in 2016.HPLC of Formula: 27249-90-7 This article mentions the following:

A series of diblock copolymers, polystyrene-block-poly (vinyl pyrrolidone) (PSt-b-PVP), with different hydrophilic/hydrophobic ratios was prepared by reversible addition fragmentation chain transfer (RAFT) polymerization The structures and properties of the diblock copolymers were characterized by FT IR, 1H NMR and GPC. Different additives and a series of PSt-b-PVP with different hydrophilic/hydrophobic ratios dissolved in selective solvents. After solvent evaporation, the transparent film was obtained by rising with water. FESEM was used to study the morphol. and size of the polymer porous material. The influence of additives, solvent evaporation temperature, the solvents and the hydrophilic/hydrophobic ratios on pore size were also studied. The results show that if the structure that we uses contains -OH functional groups or the monomer itself is used as additive, the porous polymer formed would have smaller holes. Meanwhile, reducing the heat is benefit to reduce the size of porous. And if we can use the structure which hydrophilic/hydrophobic ratios is PSt₁₀₁-b-PVP₇₉, it would be more easier to form smaller porous. Besides, using volatile solvent can be good for the forming of porous. In the experiment, the researchers used many compounds, for example, Benzyl benzodithioate (cas: 27249-90-7HPLC of Formula: 27249-90-7).

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

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