Tag: 100-200

Vaporization/sublimation enthalpies of mono- and dimethyl-esters estimated by solution calorimetry method was written by Samatov, Aizat A.;Nagrimanov, Ruslan N.;Miroshnichenko, Evgeniy A.;Solomonov, Boris N.. And the article was included in Thermochimica Acta in 2020.Computed Properties of C8H16O2 The following contents are mentioned in the article:

The additive scheme for calculating the solvation enthalpies of aliphatic compounds has been developed for linear mono- and dimethyl-esters. Ester group contribution to the enthalpy of solvation in n-heptane was obtained. Accuracy of the proposed approach for determination of solvation enthalpies of linear mono- and dimethyl-esters was tested by comparison with exptl. solvation enthalpies. In most cases, deviations do not exceed 1 kJ·mol^-1. It was found that the dependence of the solution enthalpies of mono- and dimethyl-esters on the number of carbon atoms in the mol. can be fitted by power function. This dependence and a group-additivity scheme for solvation enthalpy were used for estimation of the enthalpies of phase transitions of mono- and dimethyl-esters. Evaluated values of sublimation, vaporization, and fusion enthalpies at 298.15 K are in good agreement with exptl. data obtained by conventional methods. 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. 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. 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.Computed Properties of C8H16O2

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

Vaporization/sublimation enthalpies of mono- and dimethyl-esters estimated by solution calorimetry method was written by Samatov, Aizat A.;Nagrimanov, Ruslan N.;Miroshnichenko, Evgeniy A.;Solomonov, Boris N.. And the article was included in Thermochimica Acta in 2020.Electric Literature of C10H20O2 The following contents are mentioned in the article:

The additive scheme for calculating the solvation enthalpies of aliphatic compounds has been developed for linear mono- and dimethyl-esters. Ester group contribution to the enthalpy of solvation in n-heptane was obtained. Accuracy of the proposed approach for determination of solvation enthalpies of linear mono- and dimethyl-esters was tested by comparison with exptl. solvation enthalpies. In most cases, deviations do not exceed 1 kJ·mol^-1. It was found that the dependence of the solution enthalpies of mono- and dimethyl-esters on the number of carbon atoms in the mol. can be fitted by power function. This dependence and a group-additivity scheme for solvation enthalpy were used for estimation of the enthalpies of phase transitions of mono- and dimethyl-esters. Evaluated values of sublimation, vaporization, and fusion enthalpies at 298.15 K are in good agreement with exptl. data obtained by conventional methods. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Electric Literature of C10H20O2).

Octyl acetate (cas: 112-14-1) 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.Electric Literature of C10H20O2

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

Visible light promoted formation of N-S bond by photocatalyst Eosin Y was written by Verma, Ankit;Srivastava, Arjita;Tiwari, Saurabh K.;Yadav, Neetu;Ansari, Mohd Danish;Yadav, Vijay B.;Sagir, Hozeyfa;Siddiqui, Ibadur R.. And the article was included in Journal of Heterocyclic Chemistry in 2020.Application of 2253-73-8 The following contents are mentioned in the article:

A novel efficient protocol for the synthesis of 5-imino-1,2,4-thiadiazole motif in open air using visible light has been reported. The reaction involves Eosin Y as photocatalyst which is a cost-effective organic dye. The designed protocol represents a novel, mild, metal free, green strategy for the construction of imino-substituted thiadiazolo[4,3-a]pyridines I (R¹ = i-Pr, cyclopropyl, n-Pr, Ph, 4-O₂NC₆H₄, etc.; R² = H, 6-O₂N, 7-Me, 8-Cl, etc.) and thiadiazoles II (R¹ = Ph; R³ = n-Pr, Ph, 4-MeC₆H₄) from the corresponding R²-substituted 2-aminopyridines or amidines R³C(:NH)NH₂ and isothiocyanates R¹NCS by intramol. cyclization via N-S bond formation. The reaction was carried out under visible light exposure in ethanol:water (4:1) mixture This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8Application of 2253-73-8).

Isopropylisothiocyanate (cas: 2253-73-8) 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 2253-73-8

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

Visible light promoted formation of N-S bond by photocatalyst Eosin Y was written by Verma, Ankit;Srivastava, Arjita;Tiwari, Saurabh K.;Yadav, Neetu;Ansari, Mohd Danish;Yadav, Vijay B.;Sagir, Hozeyfa;Siddiqui, Ibadur R.. And the article was included in Journal of Heterocyclic Chemistry in 2020.HPLC of Formula: 2253-73-8 The following contents are mentioned in the article:

A novel efficient protocol for the synthesis of 5-imino-1,2,4-thiadiazole motif in open air using visible light has been reported. The reaction involves Eosin Y as photocatalyst which is a cost-effective organic dye. The designed protocol represents a novel, mild, metal free, green strategy for the construction of imino-substituted thiadiazolo[4,3-a]pyridines I (R¹ = i-Pr, cyclopropyl, n-Pr, Ph, 4-O₂NC₆H₄, etc.; R² = H, 6-O₂N, 7-Me, 8-Cl, etc.) and thiadiazoles II (R¹ = Ph; R³ = n-Pr, Ph, 4-MeC₆H₄) from the corresponding R²-substituted 2-aminopyridines or amidines R³C(:NH)NH₂ and isothiocyanates R¹NCS by intramol. cyclization via N-S bond formation. The reaction was carried out under visible light exposure in ethanol:water (4:1) mixture This study involved multiple reactions and reactants, such as Isopropylisothiocyanate (cas: 2253-73-8HPLC of Formula: 2253-73-8).

Isopropylisothiocyanate (cas: 2253-73-8) 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. 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: 2253-73-8

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

The ancient neapolitan sweet lime and the calabrian lemoncetta locrese belong to the same citrus species was written by Cautela, Domenico;Balestrieri, Maria Luisa;Savini, Sara;Sannino, Anna;Ferrari, Giovanna;Servillo, Luigi;De Masi, Luigi;Pastore, Annalisa;Castaldo, Domenico. And the article was included in Molecules in 2020.Formula: C10H20O2 The following contents are mentioned in the article:

“Neapolitan limmo” is an ancient and rare sweet Mediterranean lime, now almost extinct but used until a few decades ago for the production of a fragrant liqueur called the “four citrus fruits”. The objective of this work was to compare, through the use of chem. (flavonoids, volatile organic compounds, and chiral compounds) and mol. (DNA fingerprint based on RAPD-PCR) markers, the residual population of Neapolitan limmo with other populations of sweet limes, identified in Calabria and known as “lemoncetta Locrese”. We report for the first time specific botanical characteristics of the two fruits and unequivocally show that the ancient sweet Mediterranean limes Neapolitan limmo and lemoncetta Locrese are synonyms of the same Citrus species. Owing to the biodiversity conserved in their places of origin, it will now be possible to recover, enhance and implement the use of this ancient sweet lime for agro-industrial purposes. This study involved multiple reactions and reactants, such as Octyl acetate (cas: 112-14-1Formula: C10H20O2).

Octyl acetate (cas: 112-14-1) 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.Formula: C10H20O2

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

Optimization of an intra-oral solid-phase microextraction (SPME) combined with comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry (GC x GC-TOFMS) method for oral aroma compounds monitoring of Baijiu was written by Yu, Yamin;Chen, Shuang;Nie, Yao;Xu, Yan. And the article was included in Food Chemistry in 2022.Name: Isopentyl hexanoate The following contents are mentioned in the article:

The “after-odor” is essential to the quality and consumer preference of Baijiu. An intra-oral solid-phase microextraction (SPME) combined with comprehensive two-dimensional gas chromatog.-time-of-flight mass spectrometry (GC x GC-TOFMS) was developed for oral aroma compounds monitoring of Baijiu. The extraction time, sip volume and rinse time were 120 s, 5 mL, and 10 s, resp. The procedure showed good performances at concentrations of 1.56μg/L-1500 mg/L for different aroma compounds of Baijiu (most R² > 0.9). Furthermore, the optimized procedure detected 85 aroma compounds with different chem. structures and provided good representations of the light, strong, soy sauce and mix aroma type Baijiu’s oral aroma profiles. Principal component anal.’s (PCA) cumulative interpretation rate was 72.42%. The acceptable performance of this procedure can be combined with dynamic sensory evaluation to improve the quality of the Baijiu aroma. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Name: Isopentyl hexanoate).

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

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

Different distillation stages Baijiu classification by temperature-programmed headspace-gas chromatography-ion mobility spectrometry and gas chromatography-olfactometry-mass spectrometry combined with chemometric strategies was written by He, Fei;Duan, Jiawen;Zhao, Jiwen;Li, Hehe;Sun, Jinyuan;Huang, Mingquan;Sun, Baoguo. And the article was included in Food Chemistry in 2021.SDS of cas: 2198-61-0 The following contents are mentioned in the article:

Liquid-liquid microextraction (LLME) combined with gas chromatog.-olfactometry-mass spectrometry (GC-O-MS) was used to detect the variations in volatile compounds during the distillation process (head, heart, and tail) of raw Baijiu produced by different layers of fermented grains; 47 aroma compounds were sniffed and identified. Moreover, temperature-programmed headspace gas chromatog.-ion mobility spectrometry (TP-HS-GC-IMS) was applied to characterize the Baijiu distillation process for the first time. The 3D fingerprint spectrum clearly showed a variation in volatile compounds from different distillation stages, and most compounds showed a downward trend. In addition, multivariate statistical anal., including principal component anal. (PCA), partial least squares discriminant anal. (PLS-DA), etc., confirmed ten aroma active markers related to classification, indicating that these markers had a great influence on the flavor of raw Baijiu. 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. 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.SDS of cas: 2198-61-0

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

Aroma profile and phenolic content of merlot red wines produced in high-altitude regions in Brazil was written by Arcari, Stefany Grutzmann;Caliari, Vinicius;Luiz de Souza, Edson;Godoy, Helena Teixeira. And the article was included in Quimica Nova in 2021.Application In Synthesis of Isopentyl hexanoate The following contents are mentioned in the article:

In Brazil, wine-growing regions of high altitude have been evaluated for the cultivation of grapes destined for the production of quality wines. In this study the phenolic content, the volatile compounds profile and the in vitro antioxidant activity of samples produced in Agua Doce, Campos Novos and Tangara were determined using spectrophotometric and chromatog. techniques. A total of 95 volatile compounds were identified in the samples analyzed, of which borneol is reported in Brazilian Merlot wines for the first time. The quant. results showed that the most important volatile compounds for wine aroma were esters, fatty acids, 1-hexanol and 2-phenylethanol alcs., and C13-norisoprenoids β-damascenone and α-ionone. The phenolic content observed was comparable to the results obtained for Merlot red wines from other regions in Brazil and in other countries. Also, the wine samples were effective in capturing the free radicals DPPH and ABTS. This study involved multiple reactions and reactants, such as Isopentyl hexanoate (cas: 2198-61-0Application In Synthesis of 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. 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 In Synthesis of Isopentyl hexanoate

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

Performance and selectivity of lower-rim substituted calix[4]arene as a stationary phase for capillary gas chromatography was written by Sun, Tao;Li, Bin;Shuai, Xiaomin;Chen, Yujie;Li, WeiWei;Cai, Zhiqiang;Qiao, Xiaoguang;Hu, Shaoqiang;Ma, Lufang. And the article was included in RSC Advances in 2019.Application In Synthesis of Methyl heptanoate The following contents are mentioned in the article:

This work presents the investigation of p-tert-butyl(tetradecyloxy)calix[4]arene (C4A-C10) as stationary phase for capillary gas chromatog. (GC) separations The statically-coated C4A-C10 capillary column showed weak polarity and column efficiency of 2566 plates per m determined by n-dodecane at 120°C. Impressively, the C4A-C10 column exhibited extremely high resolving capability for a wide range of analytes from nonpolar to polar, including n-alkanes, esters, ketones, aldehydes, alcs. and bromoalkanes. Most importantly, the C4A-C10 column exhibited an excellent separation performance for positional, structural and cis-/trans-isomers. Among them, the column displayed advantageous resolving capability over the com. polysiloxane stationary phase for aromatic amine isomers. Moreover, the C4A-C10 column showed good column repeatability with RSD values below 0.06% for run-to-run, 0.12-0.27% for day-to-day and 2.8-5.3% for column-to-column. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Application In Synthesis of Methyl heptanoate).

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 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 In Synthesis of Methyl heptanoate

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

Enantiomeric synthesis of natural alkylglycerols and their antibacterial and antibiofilm activities was written by Fernandez Montoya, Deicy J.;Contreras Jordan, Luis A.;Moreno-Murillo, Barbara;Silva-Gomez, Edelberto;Mayorga-Wandurraga, Humberto. And the article was included in Natural Product Research in 2021.Application In Synthesis of Methyl heptanoate The following contents are mentioned in the article:

Alkylglycerols (AKGs) are bioactive natural compounds that vary by alkyl chain length and degree of unsaturation, and their absolute configuration is 2S. Three AKGs were synthesized in enantiomerically pure form, and were characterized for the 1st time together with 12 other known and naturally occurring AKGs. Their structures were established using ¹H and ¹³C APT NMR with 2D-NMR, ESI-MS, or HRESI-MS and optical rotation data, and they were tested for their antibacterial and antibiofilm activities. Some AKGs showed activity against 5 clin. isolates and Pseudomonas aeruginosa ATCC 15442, with MIC values in the range of 15-125μg/mL. In addition, at half of the MIC, most of the AKGs reduced Staphylococcus aureus biofilm formation in the range of 23-99% and P. aeruginosa ATCC 15442 biofilm formation in the range of 14-64%. The antibiofilm activity of the AKGs assessed in this work had not previously been studied. This study involved multiple reactions and reactants, such as Methyl heptanoate (cas: 106-73-0Application In Synthesis of Methyl heptanoate).

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. 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.Application In Synthesis of Methyl heptanoate

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