Tag: 100-200

Addition of Alcohols to Acrylic Compounds Catalyzed by Mg-Al LDH was written by Teodorescu, F.;Deaconu, M.;Bartha, E.;Zavoianu, R.;Pavel, O. D.. And the article was included in Catalysis Letters in 2014.Category: esters-buliding-blocks The following contents are mentioned in the article:

This study reports the preparation of hydrotalcite with Mg/Al molar ratio 3 by co-precipitation under low suprasatn. conditions of Mg and Al nitrated solutions with Na₂CO₃ and NaOH at pH 10. The solid was thermally decomposed at 460° in air atm. in order to obtain mixed oxides which, by means of memory effect, can reconstruct the hydrotalcite structure by hydration with bi-distilled water. The hydrotalcite and reconstructed samples by memory effect were characterized by elemental anal., powder x-ray diffraction, DRIFT and TG-DTG. Determination of the catalysts surface base sites was made using a method based on the irreversible adsorption of organic acids with different pK_a values and N₂ adsorption-desorption isotherms. The catalytic activity of these solids was evaluated in 1,4-addition of saturated linear alcs. to different acrylic compounds All these reactions arose with high selectivity in the desired product. No byproducts were detected by means of GC-MS chromatog. and ¹H NMR. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Category: esters-buliding-blocks).

Ethyl 3-ethoxypropanoate (cas: 763-69-9) 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. 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.Category: esters-buliding-blocks

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

Isothiocyanates: cholinesterase inhibiting, antioxidant, and anti-inflammatory activity was written by Burcul, Franko;Generalic Mekinic, Ivana;Radan, Mila;Rollin, Patrick;Blazevic, Ivica. And the article was included in Journal of Enzyme Inhibition and Medicinal Chemistry in 2018.Computed Properties of C4H7NS The following contents are mentioned in the article:

Finding a new type of cholinesterase inhibitor that would overcome the brain availability and pharmacokinetic parameters or hepatotoxic liability has been a focus of investigations dealing with the treatment of Alzheimer’s disease. Isothiocyanates have not been previously investigated as potential cholinesterase inhibitors. These compounds can be naturally produced from their glucosinolate precursors, secondary metabolites widely distributed in our daily Brassica vegetables. Among 11 tested compounds, Ph isothiocyanate and its derivatives showed the most promising inhibitory activity. 2-Methoxyphenyl ITC showed best inhibition on acetylcholinesterase with IC₅₀ of 0.57 mM, while 3-methoxyphenyl ITC showed the best inhibition on butyrylcholinesterase having 49.2% at 1.14 mM. Assessment of the antioxidant efficacy using different methods led to a similar conclusion. The anti-inflammatory activity was also tested using human COX-2 enzyme, ranking Ph isothiocyanate, and 3-methoxyphenyl isothiocyanate as most active, with âˆ?9% inhibition at 50 μM. This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Computed Properties of C4H7NS).

Isopropylisothiocyanate (cas: 2253-73-8) 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. 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.Computed Properties of C4H7NS

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

Volatile compounds of five types of unifloral honey in Northwest China: Correlation with aroma and floral origin based on HS-SPME/GC-MS combined with chemometrics was written by Zhu, Min;Sun, Jing;Zhao, Haoan;Wu, Fanhua;Xue, Xiaofeng;Wu, Liming;Cao, Wei. And the article was included in Food Chemistry in 2022.Computed Properties of C8H16O2 The following contents are mentioned in the article:

Discrimination of floral origin and its complemented aroma features is important for honey authentication. In this study, a comprehensive anal. of five unifloral honeys was analyzed based on the correlation between volatile compounds and aroma and floral origin using HS-SPME/GC-MS combined with chemometrics. A total of 92 volatiles were identified and relatively quantified in honey samples, 51 of which showed contribution to floral discrimination (p < 0.01), and 27 of which had aroma contribution, applying apocynum, jujube and amorpha honey with various fruity, elaeagnus with rosaceous and lavender with green flavor. Chemometrics anal. showed significant correlations between floral origin and volatiles, in particular, compounds hexanal, hexanol, heptanol and Me enanthate were tentatively selected as the key compounds to discriminate lavender honey (Lavandula angustifolia Mill.) from others. These results reveal the volatiles and aroma features in five types of unifloral honey in Northwest China and offer compelling evidence for honey authentication. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Computed Properties of C8H16O2).

Methyl heptanoate (cas: 106-73-0) 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.Computed Properties of C8H16O2

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

Reusable Na-SiO₂@CeO₂catalyst for efficient biodiesel production from non-edible wild olive oil as a new and potential feedstock was written by Khan, Ihtisham Wali;Naeem, Abdul;Farooq, Muhammad;din, Israf Ud;Ghazi, Zahid Ali;Saeed, Tooba. And the article was included in Energy Conversion and Management in 2021.SDS of cas: 106-73-0 The following contents are mentioned in the article:

The main purpose of the current research work is to design competent heterogeneous catalyst for the development of sustainable biodiesel technol. Therefore, a novel and an efficient Na-SiO₂@CeO₂ heterogeneous catalyst was designed for sustainable and eco-friendly biodiesel production using wild olive oil as a new and potentially non-edible feedstock. The designed catalyst was further characterized by using FT-IR, BET-BJH, SEM, EDX, XPS and XRD spectroscopic techniques. The exptl. results demonstrated that the synthesized catalyst appeared to be efficient for the conversion of wild olive oil to biodiesel, providing maximum yield of 97% at optimum reaction conditions: catalyst concentration 2.5wt./weight%, reaction duration 120 min, reaction temperature 65°C, and oil/methanol molar ratio 1:10. It was observed from the endurance test that the synthesized catalyst has remarkable catalytic potency upto five consecutive runs, showing profound stability with negligible leaching of the active basic sites from the surface of the catalyst. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0SDS of cas: 106-73-0).

Methyl heptanoate (cas: 106-73-0) 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, including apples, durians, pears, bananas, pineapples, and strawberries. 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.SDS of cas: 106-73-0

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

Fatty acids methyl esters: Complementary measurements and comprehensive analysis of vaporization thermodynamics was written by Zaitsau, Dzmitry H.;Pimerzin, Andrey A.;Verevkin, Sergey P.. And the article was included in Journal of Chemical Thermodynamics in 2019.Category: esters-buliding-blocks The following contents are mentioned in the article:

Vapor pressures of Me decanoate, Me undecanoate, Me tetradecanoate, Me hexadecanoate and Me octadecanoate were measured by using the static technique. Vapor pressures of Me dodecanoate, Me tridecanoate, Me tetradecanoate, Me heptadecanoate, and Me octadecanoate were measured by using the transpiration method. In the present work, vapor pressures of Me esters of the saturated fatty acids from Me propanoate to Me eicosanoate were collected from the literature. These data together with own complementary results were used for validation of methods for assessment of the difference Δ^g_lC^o_p,m required for the correct adjustment of vaporization enthalpies to the reference temperature 298.15 K. The evaluated vaporization enthalpies for esters from Me propanoate to Me eicosanoate demonstrate impeccable linear chain-length dependence. The CH₂ group contributions for different homologous series were derived and compared. Quant. anal. of dispersion interactions in the long-chained esters have been performed. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Category: esters-buliding-blocks).

Methyl heptanoate (cas: 106-73-0) 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, including apples, durians, pears, bananas, pineapples, and strawberries. 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.Category: esters-buliding-blocks

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

Changes of volatile compounds and odor profiles in Wuyi rock tea during processing was written by Guo, Xiangyang;Ho, Chi-Tang;Wan, Xiaochun;Zhu, Hui;Liu, Qiong;Wen, Zhen. And the article was included in Food Chemistry in 2021.Product Details of 2198-61-0 The following contents are mentioned in the article:

Wuyi rock tea (WRT), is one kind of oolong tea and widely appreciated for its typical ′rock flavorâ€? The odor characteristics of WRT during processing were comprehensive investigated by gas chromatog.-mass spectrometry, sensory evaluation and odor activity value (OAV). Alcs., alkenes and esters were the main volatiles formed during tea processes, but the WRT contained more heterocyclic compounds, among which 15 N-containing volatiles were newly identified in this study, accounting for 60.52% of total amounts of volatiles in WRT. In response, the original green and chem. odors converted to roasted and woody odors, and full fire processing was effective to enhance roasted, floral and woody odors, weaken chem. odor. 2-Ethyl-3,5-dimethylpyrazine (OAV 4.71) was confirmed as the aroma-active compound of WRT with roasted odor by aroma recombination experiment In addition, strong roasted, floral and moderate woody odors were perceived as the outline of ′rock flavorâ€?in WRT aroma. These results provide theor. basis for processing and quality control of WRT. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Product Details of 2198-61-0).

Isopentyl hexanoate (cas: 2198-61-0) 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. Product Details of 2198-61-0

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

Analysis of flavour compounds and prediction of sensory properties in sea buckthorn (Hippophae rhamnoides L.) berries was written by Ma, Xueying;Yang, Wei;Marsol-Vall, Alexis;Laaksonen, Oskar;Yang, Baoru. And the article was included in International Journal of Food Science and Technology in 2020.Recommanded Product: Isopentyl hexanoate The following contents are mentioned in the article:

Summary : The aim of this study was to investigate sugars, organic acids, flavonol glycosides (FGs), proanthocyanidins and volatiles as flavor compounds in sea buckthorn (SB) berries of five cultivars and to predict the sensory properties of berries. The profiles of flavor compounds in SB berries varied significantly among the cultivars. Total proanthocyanidins and FGs were highest in ‘Pertsik’ and ‘Raisa’, resp. Total volatiles were highest in ‘Vorobyevskaya’ and lowest in ‘Raisa’. A previously established PLS model was used to predict the sensory properties of SB berries based on the non-volatile flavor compounds The mouth-drying astringency can be predicted the most reliably, which has the highest regression coefficients with quinic acid, isorhamnetin-3-O-sophoroside-7-O-rhamnoside and total proanthocyanidins. Bitterness cannot be predicted using the model. ‘Pertsik’ berries were predicted to be more mouth-drying astringency and sour than those of ‘Raisa’. The research supports the cultivar selection in cultivation and industry of SB berries. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Recommanded Product: Isopentyl hexanoate).

Isopentyl hexanoate (cas: 2198-61-0) 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.Recommanded Product: Isopentyl hexanoate

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

Impact of chiral tebuconazole on the flavor components and color attributes of Merlot and Cabernet Sauvignon wines at the enantiomeric level was written by Zhao, Shanshan;Li, Minmin;Simal-Gandara, Jesus;Tian, Jian;Chen, Jieyin;Dai, Xiaofeng;Kong, Zhiqiang. And the article was included in Food Chemistry in 2022.SDS of cas: 2198-61-0 The following contents are mentioned in the article:

The impact of chiral tebuconazole on the flavor and appearance of Merlot and Cabernet Sauvignon wines were systematically studied. Gas chromatog.-ion mobility spectrometry and headspace-solid phase microextraction coupled with gas chromatog. mass spectrometry qual. and quant. identified the flavor components, and a photog. colorimeter was used for color attribute anal. Tebuconazole enantiomers had different effects on the flavor and appearance of young wines, especially R-tebuconazole. The flavor differences were mainly manifested in fruity and floral characteristics of the wine due to changes in the concentrations of acids, alcs., and esters; R-tebuconazole alters the concentrations of key flavor compounds to the greatest extent. Tebuconazole treatment changes the color of young wines, with the final red shade of wine being control group > rac-tebuconazole �S-tebuconazole > R-tebuconazole. Since chiral tebuconazole neg. alters wine, grapes treated with chiral pesticides should be subject to stricter quality control during processing. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0SDS of cas: 2198-61-0).

Isopentyl hexanoate (cas: 2198-61-0) 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. 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: 2198-61-0

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

Tuning the wettability and surface free energy of poly(vinylphenol) thin films by modulating hydrogen-bonding interactions was written by Wang, Chih-Feng;Ejeta, Dula Daksa;Wu, Jian-Yi;Kuo, Shiao-Wei;Lin, Ching-Hsuan;Lai, Juin-Yih. And the article was included in Polymers (Basel, Switzerland) in 2020.Reference of 763-69-9 The following contents are mentioned in the article:

The ability to tune the surface properties of a polymer film in a simple and effective manner is important for diverse biol., industrial, and environmental applications. In this work, we investigated whether or not the surface free energy of poly(vinyl phenol; PVPh) can be tuned by adjusting the casting solvent and the thermal treatment time, which alters the proportions of intraand intermol. hydrogen bonding interactions. Compared to the untreated sample, in THF system, the thermal treatment resulted in a lower proportion of intermol. hydrogen bonds and a concomitant decrease in the surface free energy (from 39.3 to 18.8 mJ/m2). In contrast, the thermal treatment in propylene glycol Me ether acetate (PGMEA) and ethyl-3-ethoxypropionate (EEP) systems increased the proportion of intermol. hydrogen bonds and the surface free energy of the polymer thin films, from 45.0 to 54.3 mJ/m2 for PGMEA and from 45.5 to 52.9 mJ/m2 for EEP. Controlling intermol. hydrogen-bonding interactions is a unique and easy method for tuning the surface free energies of polymer substances. This study involved multiple reactions and reactants, such as Ethyl 3-ethoxypropanoate (cas: 763-69-9Reference of 763-69-9).

Ethyl 3-ethoxypropanoate (cas: 763-69-9) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. 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. Reference of 763-69-9

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

Conversion method for linear retention indices in gas chromatography acquired using n-alkanes and n-fatty acid methyl esters was written by Li, Yong;Pang, Tao;Shi, Junli;Deng, Xiaopeng;Kong, Guanghui;Lu, Xiuping. And the article was included in Sepu in 2020.COA of Formula: C8H16O2 The following contents are mentioned in the article:

Retention index (RI) is a powerful tool for gas chromatog.-based structure elucidation of various compounds In this study, linear RIs based on n-alkanes and n-fatty acid Me esters in different temperature programs were fitted. Nearly identical first-order linearities were acquired with different temperature programs. The linear equations were y=1.0051x+318.51 (r²=1) and y=1.0362x+562.519 (r²=1) for polar (packed with polyethylene glycol) and semi-standard non-polar (packed with 5% diphenyl/95% dimethylpolysiloxane) columns, resp. The variables x and y in the equations stand for RIs based on n-fatty acid Me esters and n-alkanes, resp. The established linearity was then verified using the reference RIs collected in the NIST mass spectral library, Golm metabolite library, and Fiehnmetabolite library. The RI values converted using both the acquired equations finely matched those in the references The established relationship between the two kinds of RIs can be used to expand the RI references and decrease the number of RI acquisition experiments This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0COA of Formula: C8H16O2).

Methyl heptanoate (cas: 106-73-0) 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.COA of Formula: C8H16O2

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