Category: esters-buliding-blocks

Roppongi, Takao published the artcileSolubility and mass transfer coefficient of oxygen through gas- and water-lipid interfaces, Formula: C10H20O2, the main research area is gas water lipid interface oxygen solubility mass transfer; Henry’s constant; fatty acid; mass transfer coefficient; oxidation; vegetable oil.

The solubility of oxygen and its transfer rate to the lipid phase play important roles in lipid oxidation, which affects the taste and safety of lipid-containing foods. In this study, we measured the Henry’s constants (solubility) of oxygen for fatty acids, fatty acid esters, and triacylglycerols (TAGs; vegetable oils), as well as the mass transfer coefficients of oxygen at the gas- and water-lipid interfaces. The constants and coefficients were estimated by analyzing the change over time in the oxygen partial pressure or concentration in the closed container based on the mass balance equations of oxygen in the gas and liquid phases. The constant for water obtained by the method used in this study was in agreement with the previously reported value to confirm the validity of the method. The constants for lipids depended on the lipid type, and were higher in the order of fatty acid ester, fatty acid, and TAG. That is, the solubility of oxygen decreased in this order. For all lipids, the constant increased as the number of carbon atoms in the fatty acid chain increased. The constants for fatty acids and their esters were linearly correlated with the enthalpies of evaporation of the lipids. The mass transfer coefficients of oxygen at the gas-liquid interface were on the order of 10-5 m/s for water and Me dodecanoate and of 10-6 m/s for TAG (rapeseed oil). The coefficient at the water-lipid interface was on the order of 10-6 m/s. The Henry’s constants (solubility) and transfer rate of oxygen to the lipid phase, fatty acids, fatty acid esters, and triacylglycerols (TAG) were measured. The lipids solubilized three to five times more oxygen than water, and mass transfer rate of oxygen at gas- and water-lipid interfaces were almost same. The constants for fatty acids and fatty acid esters were linearly correlated to their enthalpies of evaporation, and this correlation is expected to be useful for estimating the Henry’s constants for other fatty acids and their esters.

Journal of Food Science published new progress about Cottonseed (oil). 106-32-1 belongs to class esters-buliding-blocks, name is Ethyl octanoate, and the molecular formula is C10H20O2, Formula: C10H20O2.

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

Satake, Akiharu published the artcileNovel η3-Allylpalladium-Pyridinylpyrazole Complex: Synthesis, Reactivity, and Catalytic Activity for Cyclopropanation of Ketene Silyl Acetal with Allylic Acetates, Safety of Ethyl 2,2-dimethylpent-4-enoate, the main research area is allyl palladium pyridinyl pyrazole preparation catalyst; cyclopropanation ketene silyl acetal allylic acetate; catalysis cyclopropanation ketene silyl acetal allylic.

Novel cationic η3-allylpalladium-pyridinylpyrazole complexes I (R = Me, But) were synthesized from 3-alkyl-5-(2-pyridinyl)pyrazole and η3-allylpalladium chloride dimer in the presence of AgBF4. Cationic complexes I were converted into neutral complexes II under basic conditions. These complexes were characterized by 1H, 13C, and 15N NMR studies. Neutral complexes II have high catalytic activity for cyclopropanation of ketene silyl acetals with allylic acetates. Comparison of the cationic and neutral complexes and the reaction mechanism of cyclopropanation were discussed.

Journal of the American Chemical Society published new progress about Cyclopropanation. 86549-27-1 belongs to class esters-buliding-blocks, name is Ethyl 2,2-dimethylpent-4-enoate, and the molecular formula is C9H16O2, Safety of Ethyl 2,2-dimethylpent-4-enoate.

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

Schork, F. Joseph published the artcileMonomer Transport in Emulsion Polymerization II: Copolymerization, Recommanded Product: Dodecyl 2-methylacrylate, the main research area is emulsion polymerization monomer transport Damkohler number.

The method for evaluating the Damkohler number for monomer transport during emulsion homopolymerization is extended to copolymerization It is shown that monomers that are not monomer-transport limited during homopolymerization may become more so during binary copolymerization, and monomers that are monomer-transport limited during homopolymerization may become less so during binary copolymerization

Macromolecular Reaction Engineering published new progress about Damkohler number. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Recommanded Product: Dodecyl 2-methylacrylate.

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

Schork, F. Joseph published the artcileMonomer transport in emulsion polymerization III terpolymerization and starved-feed polymerization, Product Details of C16H30O2, the main research area is emulsion polymerization monomer transport Damkohler number.

A simple math. model of the transport of monomer from the monomer droplets to the polymerizing polymer particles during batch emulsion homopolymerization has been developed and published previously. A Damkohler number for monomer transport in emulsion polymerization is proposed as the ratio of the maximum rate of polymerization divided by the maximum rate of monomer transport out of the monomer droplets. This Damkohler number is calculated from literature values for a number of common monomers. Following standard practice for the use of such a Damkohler number in other reaction-with-transport systems, monomers with a Damkohler number above 0.1 are considered to be transport limited. In a third paper the anal. is extended to batch binary copolymerization Here the anal. is extended to the more industrially relevant cases of batch terpolymn., starved-feed copolymerization, and the combination of the two (starved-feed terpolymn.).

Macromolecular Reaction Engineering published new progress about Damkohler number. 142-90-5 belongs to class esters-buliding-blocks, name is Dodecyl 2-methylacrylate, and the molecular formula is C16H30O2, Product Details of C16H30O2.

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

Arafa, Asmaa M. published the artcileMicropropagation, myristicin production enhancement, and comparative GC-MS analysis of the n-hexane extracts of different organs of Daucus pumilus (Gouan), family apiaceae, Computed Properties of 929-77-1, the main research area is Daucus embryogenesis organogenesis micropropagation silica apiaceae; Daucus pumilus; gas chromatography–mass spectrometry; myristicin; organogenesis; somatic embryogenesis.

Aim: This work aimed to study the somatic embryogenesis and organogenesis of endangered Daucus pumilus (Gouan) for the conservation of this plant and improving the production of secondary metabolites of medicinal value. Materials and Methods: The callus formation and in vitro propagation of D. pumilus (Gouan) by using a different combination of naphthalene acetic acid and benzylaminopurine were established. Various embryogenic stages were tracked using SEM and light microscopy. The volatile constituents of the n-hexane extracts of D. pumilus (Gouan) that extracted by ultrasonic-assisted technique were analyzed by gas chromatog.-mass spectrometry. Results and Discussion: Somatic embryogenesis and organogenesis of endangered D. pumilus (Gouan) were established for the first time. Myristicin and elemicin were successfully increased during micropropagation to 70.89% and 2.19%, resp. Furthermore, the induction of compounds such as 6-methoxymellein, eugenin, Me behenate, and 1,6-dimethylnaphthalene was also detected. Conclusion: Com., this protocol decreases the dependence on wild medicinal plants, enhances the manufacturing of valuable phytochems. to meet the great demands of the pharmaceutical industries, and acts as a mean for genetic transformation of this plant.

Journal of Pharmacy and BioAllied Sciences published new progress about Daucus (pumilus). 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Computed Properties of 929-77-1.

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

Wanmolee, Wanwitoo published the artcileOne step liquefaction of hardwood lignin to oligomers soluble in polymerizable solvents, Application In Synthesis of 539-88-8, the main research area is liquefaction hardwood lignin oligomer soluble polymerizable solvent solubility.

Today tech. lignins produced from different industrial processes are underutilized because they possess recalcitrant C-C bonds and reduced proportion of ether bonds, making it difficult to produce building block compounds in high yields. Current methods being developed to process tech. lignin and improve its usefulness involve multiple steps and the use of toxic chems. We report an innovative cleave and couple one step catalytic process on eucalyptus lignin (EUL) to form unique aromatics oligomers with aliphatic side chains using KOH/HCOOH mixture with methanol as the solvent. Under optimum condition, 71 wt% of predominantly dimers and oligomers are formed which are readily soluble in polymerizable solvents such as Me methacrylate. In this one pot process, the KOH not only acts as the catalyst but ensures complete solubilization of EUL, allowing easier cleavage of bonds to form phenolic monomers and quinone groups (which undergo ring opening) followed by repolymn. to form oligomers. The study has opened pathways toward sustainable catalytic conversion of tech. lignin to reactive macromol. building blocks to produce soft nanomaterials.

Industrial Crops and Products published new progress about Depolymerization. 539-88-8 belongs to class esters-buliding-blocks, name is Ethyl 4-oxopentanoate, and the molecular formula is C7H12O3, Application In Synthesis of 539-88-8.

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

Li, Jian-Feng published the artcileStructural characterization and aquatic toxicity prediction of esters, SDS of cas: 111-11-5, the main research area is aquatic toxicity ester compound structure relationship.

Based on the three-dimensional structures of the compounds, the structures of 48 ester compounds were expressed parametrically. Through multiple linear regression and partial least-squares regression, the relationship models between ester compound structures and aquatic toxicity log(1/IGC50) were established. The correlation coefficients (R2) of the models were 0.9974 and 0.9940, and the standard deviations (SD) were 0.0469 and 0.0646, resp. The stability of the models was evaluated by the leave-one-out internal cross-test. The correlation coefficients (RCV2) of the models of interactive tests were 0.9939 and 0.8952, and the standard deviation (SDCV) was 0.0715 and 0.0925, resp. The external samples were used to test the predictive ability of the models, and the correlation coefficients (Rtest2) of the external predictions were 0.9955 and 0.9955, and the standard deviations (SDtest) were 0.0720 and 0.0716, resp. The mol. structure descriptors could successfully represent the structural characteristics of the compounds, and the built models had good fitting effects, strong stability and high prediction accuracy. The present study has a good reference value for the study of the structure-toxicity relationship of toxic compounds in the environment.

Chinese Journal of Structural Chemistry published new progress about Aquatic toxicity. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, SDS of cas: 111-11-5.

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

Mousavi, Nayereh Sadat published the artcilePredicting the surface tension of mixtures of fatty acid ethyl esters and biodiesel fuels using UNIFAC activity coefficients, HPLC of Formula: 110-42-9, the main research area is surface tension mixture FAME biodiesel fuel UNIFAC.

This work presents the use of a formal thermodn. model together with UNIFAC activity coefficients model, without any further adjustable parameter, to predict the surface tension of biodiesel fuels based on the equality of chem. potentials between the vapor-liquid interface and liquid bulk. The biodiesel samples included in this work were reported previously in the open literature. They were produced from vegetable oils such as: canola, coconut, corn, cottonseed, hazelnut, lard, palm, peanut, rapeseed, safflower, soybean, sunflower, and Walnut. Surface tension values for 18 samples of binary, ternary and quaternary mixtures of fatty acid Et esters (FAEEs) at T = 298.15 were predicted with an average absolute relative deviation (AARD) = 1.39%. Surface tension values for 31 biodiesel samples composed by fatty acid Me esters (FAMEs) were also predicted at temperatures from 303.15 K to 353.15 K. The AARD value obtained for the 78 exptl. points of biodiesel samples was 1.86% which shows a very good agreement with exptl. measurements. In the UNIFAC method, predictions of surface tension values for the mixtures are based on the knowledge of the values of the surface tension for the pure components; these values were obtained from different sources. Also, two simple mixing rules on mass and mole fraction basis were used to predict the surface tension of biodiesel fuels. The AARD value obtained from the comparison between exptl. and calculated values were: 2.77% and 2.91% for mixing rules on mass and mole fractions, resp.

Fluid Phase Equilibria published new progress about Arachis hypogaea. 110-42-9 belongs to class esters-buliding-blocks, name is Methyl decanoate, and the molecular formula is C11H22O2, HPLC of Formula: 110-42-9.

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

Mousavi, Nayereh Sadat published the artcilePredicting the surface tension of mixtures of fatty acid ethyl esters and biodiesel fuels using UNIFAC activity coefficients, Product Details of C9H18O2, the main research area is surface tension mixture FAME biodiesel fuel UNIFAC.

This work presents the use of a formal thermodn. model together with UNIFAC activity coefficients model, without any further adjustable parameter, to predict the surface tension of biodiesel fuels based on the equality of chem. potentials between the vapor-liquid interface and liquid bulk. The biodiesel samples included in this work were reported previously in the open literature. They were produced from vegetable oils such as: canola, coconut, corn, cottonseed, hazelnut, lard, palm, peanut, rapeseed, safflower, soybean, sunflower, and Walnut. Surface tension values for 18 samples of binary, ternary and quaternary mixtures of fatty acid Et esters (FAEEs) at T = 298.15 were predicted with an average absolute relative deviation (AARD) = 1.39%. Surface tension values for 31 biodiesel samples composed by fatty acid Me esters (FAMEs) were also predicted at temperatures from 303.15 K to 353.15 K. The AARD value obtained for the 78 exptl. points of biodiesel samples was 1.86% which shows a very good agreement with exptl. measurements. In the UNIFAC method, predictions of surface tension values for the mixtures are based on the knowledge of the values of the surface tension for the pure components; these values were obtained from different sources. Also, two simple mixing rules on mass and mole fraction basis were used to predict the surface tension of biodiesel fuels. The AARD value obtained from the comparison between exptl. and calculated values were: 2.77% and 2.91% for mixing rules on mass and mole fractions, resp.

Fluid Phase Equilibria published new progress about Arachis hypogaea. 111-11-5 belongs to class esters-buliding-blocks, name is Methyl octanoate, and the molecular formula is C9H18O2, Product Details of C9H18O2.

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

Mousavi, Nayereh Sadat published the artcilePredicting the surface tension of mixtures of fatty acid ethyl esters and biodiesel fuels using UNIFAC activity coefficients, Name: Methyl docosanoate, the main research area is surface tension mixture FAME biodiesel fuel UNIFAC.

This work presents the use of a formal thermodn. model together with UNIFAC activity coefficients model, without any further adjustable parameter, to predict the surface tension of biodiesel fuels based on the equality of chem. potentials between the vapor-liquid interface and liquid bulk. The biodiesel samples included in this work were reported previously in the open literature. They were produced from vegetable oils such as: canola, coconut, corn, cottonseed, hazelnut, lard, palm, peanut, rapeseed, safflower, soybean, sunflower, and Walnut. Surface tension values for 18 samples of binary, ternary and quaternary mixtures of fatty acid Et esters (FAEEs) at T = 298.15 were predicted with an average absolute relative deviation (AARD) = 1.39%. Surface tension values for 31 biodiesel samples composed by fatty acid Me esters (FAMEs) were also predicted at temperatures from 303.15 K to 353.15 K. The AARD value obtained for the 78 exptl. points of biodiesel samples was 1.86% which shows a very good agreement with exptl. measurements. In the UNIFAC method, predictions of surface tension values for the mixtures are based on the knowledge of the values of the surface tension for the pure components; these values were obtained from different sources. Also, two simple mixing rules on mass and mole fraction basis were used to predict the surface tension of biodiesel fuels. The AARD value obtained from the comparison between exptl. and calculated values were: 2.77% and 2.91% for mixing rules on mass and mole fractions, resp.

Fluid Phase Equilibria published new progress about Arachis hypogaea. 929-77-1 belongs to class esters-buliding-blocks, name is Methyl docosanoate, and the molecular formula is C23H46O2, Name: Methyl docosanoate.

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