Tag: M.W:300-400

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Phase transfer catalysis: Effect of cationic surfactants on the free radical polymerization of methylmethacrylate

The effect of cationic surfactants, decyltrimethylammonium bromide (DTAB), dodecyltrimethylammonium bromide (DDTAB) and tetradecyltrimethylammonium bromide (TDTAB), has been studied as phase transfer catalysts (PTCs) on the free radical polymerization of methylmethacrylate (MMA) using potassium peroxydisulfate (PDS, K2S2O8) in toluene-water biphase system. Of the three PTCs in their respective critical micellar concentration (CMC) and in common concentration, the TDTAB show comparatively high rate of polymerization (Rp), 7.76 ¡Á 10-5 mol.L-1.S-1, at the lowest reaction time of 30 min in its concentration of 2 ¡Á 10-2 mol.L-1. Detailed kinetic study of polymerization of MMA has been carried out using TDTAB at a fixed time of 30 min by varying [MMA], [K2S2O8], [TDTAB] and temperature. Based on the kinetic results, the free energy of activation has been calculated, and a suitable mechanism and rate law has been proposed.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Related Products of 89972-76-9, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.89972-76-9, Name is 4′-(4-Bromophenyl)-2,2′:6′,2”-terpyridine, molecular formula is C21H14BrN3. In a Article£¬once mentioned of 89972-76-9

Self- and directed assembly of hexaruthenium macrocycles

Rigid terpyridine-based building blocks allow easy access to large polymetallomacrocycles (see picture) through a self-assembly process. Such routes are envisioned to provide one-step methods to higher order motifs and facilitate the creation of precisely organized, metal-based networks for new energy storage devices.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent£¬ Safety of MitMAB, Which mentioned a new discovery about 1119-97-7

CATIONIC LIPOSOMES

Disclosed herein are cationic liposomes suitable for specific delivery of immunomodulating agents to monocytes and dendritic cells. The cationic liposomes comprise phospholipids, cholesterol, cationic lipids, PEG and at least one active ingredient and have a zeta potential in the range of 13-25 mV. Further disclosed are uses of such cationic liposomes in various pharmaceutical applications.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Electric Literature of 89972-76-9, Because a catalyst decreases the height of the energy barrier, its presence increases the reaction rates of both the forward and the reverse reactions by the same amount.89972-76-9, Name is 4′-(4-Bromophenyl)-2,2′:6′,2”-terpyridine, molecular formula is C21H14BrN3. In a article£¬once mentioned of 89972-76-9

Kroehnke reaction in aqueous media: one-pot clean synthesis of 4?-aryl-2,2?:6?,2?-terpyridines

A clean aqueous Kroehnke reaction process has been accomplished via a one-pot procedure of 2-acetylpyridine with aromatic aldehyde and ammonium acetate under microwave irradiation or conventional heating conditions. This method is convenient, economic and environmental friendly.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Related Products of 122-18-9, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 122-18-9, Name is N-Benzyl-N,N-dimethylhexadecan-1-aminium chloride, molecular formula is C25H46ClN. In a Article£¬once mentioned of 122-18-9

Ternary Water-in-Oil Microemulsions Made of Cationic Surfactants, Water, and Aromatic Solvents. 3. Self-Diffusion Studies in Relation to Exchange of Material between Droplets and Percolation

Ternary water-in-oil microemulsions using alkylbenzyldimethylammonium chloride (alkyl = dodecyl (N12), tetradecyl (N14), and hexadecyl (N16)) surfactants and benzene or chlorobenzene as oils have been investigated by means of electrical conductivity and NMR self-diffusion.The variations of the water self-diffusion coefficient with the / molar concentration ratio omega and with the volume fraction of benzene in the oil mixture in water/(benzene + chlorobenzene)/N16 microemulsions are well correlated with the changes of electrical conductivity, as expected from a model of microemulsions where the water cores of the droplets become increasingly connected above the percolation threshold.These connections, however, have a strongly dynamic character.This model permits us to explain the widely differing magnitudes of the changes of electrical conductivity, water self-diffusion coefficient, and rate of exchage of reactants between droplets upon increasing omega.The self-diffusion coefficient of the oil has been found to be about half that of the bulk oil, as in studies reported by others.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Related Products of 943757-71-9, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.943757-71-9, Name is (R)-2-(Diphenyl((trimethylsilyl)oxy)methyl)pyrrolidine, molecular formula is C20H27NOSi. In a Article£¬once mentioned of 943757-71-9

Organocatalytic cascade reactions: Towards the diversification of hydroisochromenes and chromenes through two different activation modes

The organocatalytic enantioselective syntheses of functionalized hydroisochromenes and chromenes by trienamine-mediated [4+2]-cycloaddition/ nucleophilic ring-closing and iminium-ion/aminal-mediated oxa-Michael/Michael/ nucleophilic ring-closing with 2-nitroallylic alcohols are presented. The corresponding cycloadducts, with up to five stereocenters, are formed in good yield and excellent enantioselectivities. The synthetic applications of the obtained products have been demonstrated. High five. The organocatalytic enantioselective syntheses of functionalized hydroisochromenes and chromenes by trienamine-mediated [4+2]-cycloaddition/nucleophilic ring closing and iminium-ion/aminal-mediated oxa-Michael/Michael/nucleophilic ring closing with 2-nitroallylic alcohols are presented. The corresponding cycloadducts, with up to five stereocenters, are formed in good yield and excellent enantioselectivities.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is traditionally divided into organic and inorganic chemistry. COA of Formula: C21H46BrN. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 1120-02-1

Spherical micelle formation by mixed quaternary ammonium surfactants with long, and short, tails in ethanol/water solvent and micellar freezing upon solubilising styrene polymerisation

The association of mixed docosyltrimethylammobium bromide and octadecyltrimethylammonium bromide, C22TABr/C18TABr, in ethanol (a common solvent favoured for both their alkyl tails and head-groups) induced by the addition of water (a non-solvent for the tails) has been studied using light-scattering measurements. Under the assistance of NaBr, which promoted the surfactant molecules to pack tightly in the micelles, mono-disperse spherical micelles composed of mixed C22TABr/C18TABr were obtained in ethanol/water (15/85?wt%). Styrene was solubilised into the templating C22TABr/C18TABr micelles (betasurf, the molar ratio of C18TABr to C22TABr, was 2.5) and then was polymerised in situ. To achieve a good freezing effect, the amount of styrene solubilised, represented as the molar ratio of styrene monomer to total surfactants, nst/nsurf, was required to be greater than 4.87 for this templating micellar system. The diluting tests demonstrated that, after polymerisation, the styrene-containing micelles froze their microstructure well. Light-scattering measurements, and TEM observation, all indicated that these micelles were mono-dispersed, and retained their spherical shape. As swollen by polystyrene, the micelle had an avarage radius of 18?nm.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Reference of 1119-97-7, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1119-97-7, Name is MitMAB, molecular formula is C17H38BrN. In a Conference Paper£¬once mentioned of 1119-97-7

Phase diagram of tetradecyltrimethylammonium bromide (TTAB) + water + octanol system with application of mechanical deformation

Morphological properties of tetradecyltrimethylammonium bromide (TTAB) + water + octanol system in different concentrations have been studied. In the process, isotropic phase (L1) and nematic calamitic (NC), nematic discotic (ND), hexagonal E and lamellar D anizotropic mesophases have been determined by polarizing microscopy method and partial ternary phase diagram of the system set up. Textural properties of the anisotropic mesophases of the system have been discussed and their birefringence values measured. Mechanical deformation has been applied to the mesophases. The textural properties and the birefringence values have been observed to be changed by the deformation, after and before which changes have been compared.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Chemistry is traditionally divided into organic and inorganic chemistry. Recommanded Product: 1119-97-7. The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent£¬Which mentioned a new discovery about 1119-97-7

Kinetics of the diazotization and azo coupling reactions of procaine in the micellar media

The kinetics of the diazotization reaction of procaine in the presence of anionic micelles of sodium dodecyl sulfate (SDS) and cationic micelles of cetyltrimethyl ammonium bromide (CTAB), dodecyltrimethyl ammonium bromide (DDTAB) and tetradecyltrimethyl ammonium bromide (TDTAB) were carried out spectrophotometrically at lambdamax=289nm. The values of the pseudo first order rate constant were found to be linearly dependent upon the [NaNO2] in the concentration range of 1.0¡Á10-3moldm-3 to 12.0¡Á10-3moldm-3 in the presence of 2.0¡Á10-2moldm-3 acetic acid. The concentration of procaine was kept constant at 6.50¡Á10-5moldm-3. The addition of the cationic surfactants increased the reaction rate and gave plateau like curve. The addition of SDS micelles to the reactants initially increased the rate of reaction and gave maximum like curve. The maximum value of the rate constant was found to be 9.44¡Á10-3s-1 at 2.00¡Á10-3moldm-3 SDS concentration. The azo coupling of diazonium ion with beta-naphthol (at lambdamax=488) nm was found to linearly dependent upon [ProcN2+] in the presence of both the cationic micelles (CTAB, DDTAB and TDTAB) and anionic micelles (SDS). Both the cationic and anionic micelles inhibited the rate of reactions. The kinetic results in the presence of micelles are explained using the Berezin pseudophase model. This model was also used to determine the kinetic parameters e.g. km, Ks from the observed results of the variation of rate constant at different [surfactants].

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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Total Syntheses of Rhodomolleins XX and XXII: A Reductive Epoxide-Opening/Beckwith?Dowd Approach

A new TiIII-mediated reductive epoxide-opening/ Beckwith?Dowd rearrangement process efficiently assembles the bicyclo[3.2.1]octane framework of highly oxidized grayanane diterpenoids. By incorporation of a Cu(tbs)2-catalyzed (tbs=N-tert-butylsalicylaldiminato) intramolecular cyclopropanation, a diastereoselective oxidative dearomatization-induced Diels?Alder cycloaddition and a MeReO3-catalyzed Rubottom oxidation, this approach has enabled the first total syntheses of rhodomolleins XX and XXII in 23 and 22 steps, respectively.

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Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI