Aim: Dimedone , gamma pyrone and barbituric acid and their derivatives have also been found to be very important from their application point of view. Thus our aim was to prepare more derivatives from them. Method : Dimedone , gamma pyrone and barbituric acid have been treated with dimethyl sulphoxide and acetic anhydride reagent under varying temperature conditions in order to get more compoun...

[reaction: see text] The reaction of CH(4) with CO(2) has been performed in anhydrous acids using VO(acac)(2) and K(2)S(2)O(8) as promoters. NMR analysis establishes that the primary product is a mixed anhydride of acetic acid and the acid solvent. In sulfuric acid, the overall reaction is CH(4) + CO(2) + SO(3) --> CH(3)C(O)-O-SO(3)H. Hydrolysis of the mixed anhydride produces acetic acid and t...

Paris green or Schweinfurt's green is a cheniical compound of arsenic, copper and acetic acidIts chemical name is copper aceto-arsenite, its f?r" mula being 3 Cu H As 03 -jCu (C2 H3 Os)r It is therefore a double salt of copper arsenite and acetate. It is a microcrystalline powder 01 emerald green colour. It is practically insoluble in water. It is perfectly soluble in ammonia a11 concentrated a...

1. Inmildlyalkaline suspension collagenis acetylated by acetic anhydride at the free amino groups. The number of N-acetyl groups introduced is equal to the total number of lysine and hydroxylysine residues found by analysis. 2. Dry collagen does not react with cold acetic anhydride, but in the presence of acetic acid or of small amounts of water both Nand O-acetylation take place. 3. The reacti...

linear low density polyethylene (lldpe) was blended with esterified styrene-maleic anhydride (esma) and its physical and mechanical properties were studied. styrene-maleic anhydride (sma) copolymer was synthesized by precipitation reaction. then, sma was esterified by 1-decanol in methylethyl ketone solvent. from the ftir spectrum of esma it is evident that the corresponding peaks of anhydride ...

the nanoparticles of gold doped with various percentage of copper (cu 10%, 25%, 75%) were synthesized by wet-chemical method at room temperature. copper (ii) sulfate and gold (iii) chloride trihydride was taken as the metal precursor and ascorbic acid as a reducing agent and anhydride maleic as surfactant. the reaction is performed with high-speed stirring at room temperature under nitrogen atm...

In this investigation thermochemical properties of 3-hydroxyphthalic anhydride were determined. Fusion enthalpy, fusion temperature and molar heat capacity in solid phase obtained by differential scanning calorimetry. By the Knudsen effusion method, enthalpy sublimation at 298.15 K was obtained. thermogravimetric data, it possible to determine vaporization. On other hand, formation determined c...

Insulin receptors from human placenta have been labeled by using an oxidative iodination procedure (iodogen-mediated or chloramine-T-mediated), Bolton-Hunter reagent or [3H]acetic anhydride. The oxidative iodination procedure reduces the affinity for 131I-insulin and the receptor protein becomes fragmented into smaller pieces with an s20,w value of 5-6. However, treatment with Bolton-Hunter rea...

The rare earth metal(III) trifluoromethanesulfonate (rare earth metal(III) triflate, RE(OTf)3) was found to be an efficient catalyst for aromatic nitration with carboxylic anhydride-inorganic nitrate as the nitrating agent. In the presence of a catalytic amount of RE(OTf)3, the nitration of substituted benzenes proceeded to afford the corresponding nitrobenzenes. Especially, scandium(III) trifl...

The aim of this study was to investigate the effect of esterification via acetic or propionic anhydride on the surface roughness of eastern cottonwood. Eastern cottonwood (Populous deltoides) was esterified by using acetic or propionic anhydride without using any solvent or catalyst under different conditions. Two different weight percentage gains (WPGs) were obtained for each of the modifying ...