Tag: M.W=250-300

Singh, Anil K.; Manjula, D. published the artcile< A fluorescence study of 1-p-aminophenyl-4-phenylbuta-1E,3E-diene in organic solvents, 1,4-dioxane-water binary mixtures and micelles>, Formula: C19H34O2, the main research area is fluorescence aminophenylphenylbutadiene organic solvent; solvent effect fluorescence aminophenylphenylbutadiene; dioxane water binary mixture fluorescence aminophenylphenylbutadiene; micelle fluorescence aminophenylphenylbutadiene.

1-P-Aminophenyl-4-phenylbuta-1E,3E-diene (1) was synthesized and its UV-visible absorption and fluorescence emission and excitation spectral properties in a variety of media including organic solvents and 1,4-dioxane-water binary mixtures of varying relative permittivity, and microheterogeneous media of SDS, CTAB and Triton-X-100 micelles were examined In contrast to a largely solvent polarity insensitive nature of the UV-visible absorption and fluorescence excitation spectra, the fluorescence emission maximum (λf max) and the fluorescence quantum yield (Φf) of 1 are significantly influenced by polarity of the medium. The aminodiene 1 in nonpolar n-heptane shows λf max at 422 nm, but in relatively more polar solvents it shows two bands at 426-438 and 467-492 nm, depending on the relative permittivity of the medium. In general, as the polarity of medium is increased, the λf max of 1 undergoes gradual red shift with decreased fluorescence intensity at the shorter wavelength fluorescence band and enhanced fluorescence intensity at the longer wavelength fluorescence band. Further, as the polarity of the medium is increased, the Φf decreases. The solvatochromic fluorescence of 1 also was discussed in terms of the solvent polarity parameter, Δf. In the micellar medium also, 1 exhibits two fluorescence bands, which appear more prominently in SDS micelles as compared to in CTAB or in Triton-X-100 micelles. The positions of the fluorescence bands are dependent on the electronic charges of the micelles. Micropolarity of the solubilization site of 1 in various micelles also was discussed and probably 1 is intercalated in the interfacial domains of the micelles. In general, 1 fluoresces more efficiently in neutral micelles of Triton-X-100 than in ionic micelles of SDS or CTAB. The fluorescence properties of 1 were discussed in terms of the involvement of apolar, initially prepared locally excited state (in nonpolar medium) and dipolar, intramol. charge transfer excited state (in polar medium) along with the possible influence of the solvent polarity induced energy level reordering of the lowest singlet excited states of the aminodiene. This study has brought out interesting features of the excited state structure and dynamics of donor-acceptor diphenylpolyenes and showed the importance of charge transfer excited states in the photoprocesses of linear polyenes in general. Addnl., it provides new directions for designing fluorescence probes as sensors and reporters of the microenvironment of organized assemblies.

Journal of the Indian Chemical Society published new progress about Alkadienes Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), SPN (Synthetic Preparation), PROC (Process), PREP (Preparation). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Formula: C19H34O2.

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

Naga, Naofumi; Satoh, Mitsusuke; Magara, Tomoyuki; Ahmed, Kumkum; Nakano, Tamaki published the artcile< Synthesis of gels by means of Michael addition reaction of multi-functional acetoacetate and diacrylate compounds and their application to ionic conductive gels>, Quality Control of 112-63-0, the main research area is acetoacetate diacrylate Michael addition reaction ionic conductive polymer gel; mech property.

Michael-addition reactions of multi-functional acetoacetate, meso-erythritol tetraacetoacetate (ETAA), trimethylolpropane triacetoacetate (TPTAA), and diacrylate compounds, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,9-nonanediol diacrylate, or poly(ethylene glycol) diacrylate (PEGDA), in DMSO have successfully yielded the corresponding gels in the presence of 1,8-diazabicyclo[5.5.0]undecane-7-ene as a catalyst at room temperature The gel formation rates of the reaction systems with TPTAA were higher than those with ETAA. The gels prepared with the alkyl diacrylate compounds or low mol. weight PEGDA showed higher Young’s modulus in compression test. The ETAA-PEGDA gels were also prepared in propylene carbonate containing Li ion or in an ionic liquid These gels showed good ionic conductivity with conductivity value as high as 2.26 and 2.38 mS/cm at room temperature for the Li ion and ionic liquid containing systems resp.

Journal of Polymer Science (Hoboken, NJ, United States) published new progress about Activation energy. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Quality Control of 112-63-0.

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

Suzuki, Takayoshi; Nagae, Osamu; Kato, Yuka; Nakagawa, Hidehiko; Fukuhara, Kiyoshi; Miyata, Naoki published the artcile< Photoinduced Nitric Oxide Release from Nitrobenzene Derivatives>, Formula: C19H34O2, the main research area is nitrobenzene derivative preparation photoinduced NO donor antitumor cancer.

A new type of photoinduced nitric oxide (NO) donors was designed from nitrobenzene derivatives Visible-light irradiation of 2,6-dimethylnitrobenzenes bearing extended π-electron systems at the 4-position revealed efficient NO release using ESR anal. and the Griess assay. Computational study and UV spectrum anal. suggested that the NO-releasing activity was closely related to the conformation of the nitro group, the absorption intensity, and the length of the conjugated π-electron system. Employing the photodependent cytotoxicity of compound 14 against HCT116 human colon cancer cells, it was demonstrated that 4-substituted-2,6-dimethylnitrobenzene analogs are useful NO donors for the time- and site-controlled NO treatment.

Journal of the American Chemical Society published new progress about Antitumor agents. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Formula: C19H34O2.

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

Raczynska, E. D. published the artcile< Application of semiempirical method (AM1) to the study of tautomeric equilibria in the gas phase for simple compounds containing the amidine group: 4(5)-substituted imidazoles>, Category: esters-buliding-blocks, the main research area is MO gas phase tautomeric equilibrium imidazole; protonation amidine imidazole derivative; acid base equilibrium amidine imidazole derivative.

Semiempirical method (AM1) has been used to predict the tautomeric equilibrium constants (pKT) in the gas phase for 4(5)-substituted imidazoles. The pKT values have been calculated on the basis of heats of formation of individual tautomers. In calculations it has been assumed that the TΔS term has the same value for both tautomers. For comparison, the pKT values have also been estimated on the basis of the calculated (by AM1) proton affinities of N-methyl-4- and 5-substituted imidazoles. Both estimations give almost the same pKT values. Obtained results are compared with those found in solution Comparison shows that the gas-phase substituent effects do not reproduce well those in solution To find an explanation of this observation, the influence of rotational isomerism of substituent on the tautomeric equilibrium constant has been studied. Proton affinities and deprotonation enthalpies of 4- and 5-substituted imidazoles have also been calculated For unsubstituted imidazole, 4(5)-methyl-imidazole and their N-Me derivatives they are compared with those exptl. obtained. Errors are considerably smaller than the average errors of AM1 method for nitrogen acids and bases.

Analytica Chimica Acta published new progress about Acid-base equilibrium. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Category: esters-buliding-blocks.

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

Kamiya, Mamoru; Akahori, Yukio published the artcile< π-Electronic structures of amino-substituted purines and pyrimidines>, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate, the main research area is electronic structure amino purines; pyrimidenes electronic structure; transition purines pyrimidines.

SCF MO calculations (both with and without configuration interaction) were reported for all known aminosubstituted purines and pyrimidines by using the Pariser-Parr-Pople method in the self-consistent electronegativity approximation (R. D. Brown and M. L. Heffernan, 1958). The results are given of the π-π* transition energy, their oscillator strength, the directions of their transition moment, the energies of the highest-occupied and the lowest-vacant orbitals, the π-electron d. in the ground and the 1st excited (S1) and triplet (T1) states, and the frontier electron d. in the ground state. The 1st and 2nd π-π* transition energies in monoaminopyrimidines agree with experiments, without configuration interactions; the predicted amino-substitution effects on the decrease in the transition energy and the increase in the oscillator strength also agree with the exptl. found sequence. The transition energies for the purines, on the other hand, agree with experiments when the configuration interactions are taken into consideration; such comparison allows the assignment of the 4 absorption bands (4.6 ∼ 6.6 eV). The inclusion of configuration interaction increases the difference in the S1 and T1 energies of the purines but it decreases the corresponding difference in the pyrimidines. The compounds examined were pyrimidine, 2-, 4-, and 5-aminopyrimidine, 2,4-, 2,5-, 4,5-, and 4,6-diaminopyrimidine, 2,4,5-, 2,4,6-, and 4,5,6-triaminopyrimidine, 2,4,5,6-tetraminopyrimidine, purine, 2-, 6-, and 8-aminopurine, 2,6-, 2,8-, and 6,8-diaminopurine, and 2,6,8-triaminopurine.

Nippon Kagaku Zasshi published new progress about Electron configuration. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Safety of (9Z,12Z)-Methyl octadeca-9,12-dienoate.

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

Tresohlava, Eliska; Popelka, Stepan; Machova, Ludka; Rypacek, Frantisek published the artcile< Modification of Polylactide Surfaces with Lactide-Ethylene Oxide Functional Block Copolymers: Accessibility of Functional Groups>, Reference of 112-63-0, the main research area is polylactide surface lactide ethylene oxide functional block copolymer.

Feasibility of using amphiphilic block copolymers composed of polylactide (PLA) and poly(ethylene oxide) (PEO) blocks for biomimetic surface modification of polylactide-based biomaterials for tissue engineering was investigated. PEO-b-PLA copolymers were deposited on the PLA surface from a solution in PEO-selective solvent. Copolymers with a neutral ω-methoxy end group of the PEO block (mPEO-b-PLA) were used to provide hydrophilic surface of PLLA, which exhibited suppressed nonspecific protein adsorption. Their analogs, containing biotin group at the end of PEO block (bPEO-b-PLA), were used as a model of functional copolymers, carrying a biomimetic group, for example, a cell-adhesion fibronectin-derived peptide sequence. The surface topog. of functional groups on the modified surface and their accessibility for interaction with a protein receptor was investigated, taking advantage of specific biotin-avidin interaction, on surfaces modified with a combination of mPEO-b-PLA and bPEO-b-PLA copolymers. The accessibility of model biotin groups for interaction with their protein counterpart was proven through visualization of avidin or avidin-labeled nanospheres with at. force microscopy.

Biomacromolecules published new progress about Adsorption (of proteins). 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Reference of 112-63-0.

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

Ravit, B.; Cooper, K.; Buckley, B.; Yang, I.; Deshpande, A. published the artcile< Organic compounds associated with microplastic pollutants in New Jersey, U.S.A. surface waters>, Application In Synthesis of 112-63-0, the main research area is organic compound microplastic surface water New Jersey.

Extensive manufacturing and ubiquitous use in every sector of today’s society has resulted in plastics being detected in all terrestrial and aquatic environments examined to date. However, the pervasiveness of small, potentially invisible, microplastics, their associated chem. additives, and organic compounds that absorb to plastic substrates are the topics of recent investigations. These micro- to nano- size plastic particles that are deliberately manufactured or were fragmented from larger plastic products are now ending up in food webs and worldwide environmental systems. Using a pyrolysis GC-MS method, plastic polymer composition was determined in samples obtained from freshwaters in urban New Jersey. Three polymers dominated the samples: polyethylene (43%), polypropylene (33%), and polystyrene (13%). The dominant polymers differed in each river. To identify Persistent Organic Pollutants sorbed to microplastic particles, headspace solid phase micro extraction coupled with gas chromatog./ion trap mass spectrometry was employed. In the majority of upriver sampling locations, Tentatively Identified Compounds were associated with both the microplastic and the water column fractions in roughly equal proportions. However, in the tidal portion of the Passaic River and in samples from Newark and Raritan Bays, the majority of organic compounds were associated with the microplastic fraction only. Based on a search of chem. databases, the possible source/use of 180 of the 223 compounds identified, whose total mass was 1 ng or more, was determined Forty one percent of the identified compounds were natural substances, thirty five percent were identified as laboratory/research chems. and seven percent were pharmaceutical or biomedical compounds Twelve identified compounds are used for industrial purposes, including a plasticizer and an insecticide. Six compounds are used as cosmetic additives. The findings of this study illustrate the diversity of organic compounds associated with the presence of microplastics in aquatic media.

AIMS Environmental Science published new progress about Bays. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Application In Synthesis of 112-63-0.

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

Formiga, Marcos A. Jr.; Camacho-Pereira, Juliana published the artcile< Assessing mitochondrial function in sciatic nerve by high-resolution respirometry>, Related Products of 112-63-0, the main research area is mitochondrial function sciatic nerve respirometry muscle fiber ROS.

Mitochondrial dysfunction in peripheral nerves accompanies several diseases associated with peripheral neuropathy, which can be triggered by multiple causes, including autoimmune diseases, diabetes, infections, inherited disorders, and tumors. Assessing mitochondrial function in mouse peripheral nerves can be challenging due to the small sample size, a limited number of mitochondria present in the tissue, and the presence of a myelin sheath. The technique described in this work minimizes these challenges by using a unique permeabilization protocol adapted from one used for muscle fibers, to assess sciatic nerve mitochondrial function instead of isolating the mitochondria from the tissue. By measuring fluorimetric reactive species production with Amplex Red/Peroxidase and comparing different mitochondrial substrates and inhibitors in saponin-permeabilized nerves, it was possible to detect mitochondrial respiratory states, reactive oxygen species (ROS), and the activity of mitochondrial complexes simultaneously. Therefore, the method presented here offers advantages compared to the assessment of mitochondrial function by other techniques.

Journal of Visualized Experiments published new progress about Energy metabolism, animal. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.

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

Greis, Kim; Kirschbaum, Carla; Leichnitz, Sabrina; Gewinner, Sandy; Schoellkopf, Wieland; von Helden, Gert; Meijer, Gerard; Seeberger, Peter H.; Pagel, Kevin published the artcile< Direct Experimental Characterization of the Ferrier Glycosyl Cation in the Gas Phase>, Formula: C12H16O7, the main research area is Ferrier glycosyl cation gas phase structure exptl characterization.

The Ferrier rearrangement reaction is crucial for the synthesis of pharmaceuticals. Although its mechanism was described more than 50 years ago, the structure of the intermediate remains elusive. Two structures have been proposed for this Ferrier glycosyl cation: a 1,2-unsaturated cation that is resonance-stabilized within the pyranose ring or a cation that is stabilized by the anchimeric assistance of a neighboring acetyl group. Using a combination of gas-phase cryogenic IR spectroscopy in helium nanodroplets and first-principles d. functional theory, we provide the first direct structural characterization of Ferrier cations. The data show that both acetylated glucal and galactal lead to glycosyl cations of the dioxolenium type.

Organic Letters published new progress about Conformation. 4098-06-0 belongs to class esters-buliding-blocks, and the molecular formula is C12H16O7, Formula: C12H16O7.

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

Chen, Jing; Zhou, Ji; Li, Mingxia; Li, Mu; Hu, Yunan; Zhang, Tao; Shi, Lianxuan published the artcile< Membrane lipid phosphorus reusing and antioxidant protecting played key roles in wild soybean resistance to phosphorus deficiency compared with cultivated soybean>, Category: esters-buliding-blocks, the main research area is Glycine soja phosphorus deficiency membrane lipid antioxidant protecting.

Crop yield and quality are generally limited by poor soils, which is a key limiting factor for sustainable development in modern agriculture. Wild soybean (Glycine soja) is an excellent wild resource, with tolerance to adverse environments, especially poor soil. This study aimed to reveal the key mol. mechanism of wild soybean to resist phosphorus deficiency in soil. Differences in the types, amounts and metabolic pathways of small mol. metabolites and gene expression were compared and multi-omics integration anal. was performed between wild and cultivated soybean (Glycine max) seedling roots under sufficient and artificially simulated low-phosphorus in this study. Results Under low-phosphorus stress, wild soybean seedlings experienced less growth inhibition and rootspecific growth compared with cultivated soybean. Genes encoding sulfoquinovosyl transferase (SQD2), catechol O-methyltransferase (COMT), glutathione S-transferase (GST) and peroxidase (POD) were upregulated; levels of glutamic acid, glycine, putrescine, phenylalanine, tyrosine, catechol and neohesperidin were increased; and levels of glycerol-3-phosphate decreased. Integrated anal. showed that the above genes and metabolites were involved in glutathione metabolism, glycerolipid metabolism and phenylpropane biosynthesis. Conclusions These metabolic pathways are involved in phosphorus reuse, while membrane lipid remodeling and reactive oxygen species scavenging are carried out to maintain membrane stability and ensure plant survival under phosphorus deficiency. This study provides new ideas for the study of mechanism of tolerance to phosphorus deficiency in wild soybean and lays the theor. foundation for developing varieties of cultivated soybean that tolerate poor soils.

Plant and Soil published new progress about Antioxidants. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Category: esters-buliding-blocks.

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