Then each chitosan sample was-acetylated with acetic anhydride under a homogeneous condition where chitosan was dissolved in a simple aqueous acetic acid. The degree of-acetylation was estimated byH NMR spectroscopy. As a result, the water-solubility of-acetylated chitosan with about 50% substitution...
In this study, as a continuation of our previous studies, chemical modification of low-molecular-weight polystyrenes (PSs) was carried out with various functional group modifiers: epichlorohydrin (ECH), maleic anhydride (MA) and acetic anhydride (AA), in a single stage using a cationic catalyst...
a1.2 Mr. Enrico Ruffini or Fausto Ramozzi for Acetic Anhydride and Weak Acid Recovery production at a monthly rate of Euro 12,000 per person 1.2 先生。 恩里科Ruffini或Faustus Ramozzi为乙酸酐和微弱的酸补救生产在到月度就职欧洲12,000为人[translate] ...
N-methylisatoic anhydride (M25) is a useful precursor for preparing esters or amides of the small N-methylanthranilic acid fluorophore. The small size of this fluorophore should reduce the likelihood that the label will interfere wi...
20 min in paraformaldehyde (4%), digested for 30 min at 37°C with proteinase K (10 µg/ml in 100 mM Tris–HCl containing 50 mM EDTA, pH 8.0), acetylated with acetic anhydride (0.25% in 0.1 M trietholamine, pH 8.0) and dehydrated through graded concentrations of ...
Bromoethyl mercury; 1-acetaldehyde–2,3,6-trichlorobenzene; 1-n-butylamine-n-butadiene; hexene; methyl succinic anhydride; 2-methyl-propanal; Chloro-acetic acid; 1,1-ethylene-di-oxy-di-propane; isopropanol; dextroamphetamine; butyl mesylate. ...
Polysaccharides can be modified or derivatized by etherification (e.g., via treatment with propylene oxide, ethylene oxide, 2,3-epoxypropyl trimethyl ammonium chloride), esterification (e.g., via reaction with acetic anhydride, octenyl succinic anhydride (‘OSA’)), acid hydrolysis, dextrinization,...
PEG-600 mediated simple, efficient and eco-friendly synthesis of N-substituted imides and chemo selective C =C reduction Phthalic anhydride 1 was reacted with aromatic primary amines 2 in acetic acid at room temperature to yield mono acid mono amide derivatives 3. The latter ... PP Kumar,B ...
A few drops of concentrated sulfuric acid is added to a stirring solution of 35.0 g of 4-methacrylamidosalicylic acid (prepared according to Example 1) in 350 mL of acetic anhydride at 0° C. The solution is stirred for 60 minutes at 0° C. and then for an additional 6 hours at room...
aromatic monomers, especially styrene, with one or more additional unsaturated, copolymerizable monomers, particularly the ethylenically unsaturated nitrile monomers (such as acrylonitrile and/or methacrylonitrile), maleic anhydride, alkyl methacrylate, N-substituted maleimide or other polymerizable comonomers...