the water (18 ml, 1.0 mole) distilled off as the azeotrope, and the residue distilled under reduced pressure to afford 87.7 gm (89.5%) of the anhydride, b.p. 82-84°C (15 mm), m.p. 53°C. The residue remaining in the flask consists of about 10 gm of fumaric acid, m.p. 287...
Maleic anhydride CAS:108-31-6 MW:98.05688 MF:C4H2O3 Maleic Anhydride (MAN) is an organic compound with the chemical formula C4H203. It is the acid anhydride of maleic acid and in its pure state it is a colourless or white solid with an acrid odour. Maleic anhydride is truly a remarka...
the environment through various waste streams(SRC). Maleic acid is released directly to the environment in motor vehicle exhaust(3,4) and as a component of tobacco smoke(5). Maleic acid may be formed in the atmosphere via hydrolysis of anthropogenic releases or formation of maleic anhydride(6)...
Maleic anhydride is prepared commercially by theoxidation of benzene or by the reaction of butane with oxygen in thepresence of a vanadium catalyst. 3.6 Purification Methods Crystallise the acid from acetone/pet ether (b 60-80o) or hot water. Dry it at 100o. [Beilstein 2 H 748, 2 I ...
FIG. 1 is a graphical illustration showing the release of various concentrations of dipivefrin (DPE) over time from poly(methylvinylether/maleic anhydride) copolymers containing different amounts of free acid illustrating the principles of the present invention; ...
14. The process of claim 13 wherein the organic reducing agent is an organic acid, aldehyde or secondary alcohol. 15. In a process for producing maleic anhydride from n-butane, n-butenes, 1,3-butadiene or a mixture thereof with molecular oxygen in the vapor phase at a reaction temperature...
Structural investigations on maleic anhydride (MAn) copolymers with ethene, propene and styrene, their products of hydrolysis, and their methyl half-esters by means of 13 C NMR spectroscopy are presented. The spectra of 2,3-diethylsuccinic acid and its anhydrides in the erythro - and threo -...
forming a thin layer by coating a coating solution including a polyimide-based polymer end-capped with maleic acid anhydride, having a heteroaromatic pendant group including a heteroatom in its polyimide major chain, a photoinitiator and a crosslinking agent on a substrate, and drying the substrate...
At acidic pH, the maleamate amide bond is cleaved, yielding a cyclic anhydride and the amine. Thus, disubstituted maleic anhydride derivatives provide a means to reversibly link a molecule of interest, such as a small molecule, targeting group, steric stabilizer, or nucleic acid to an amine-...
Examples of suitable maleic-containing terpolymers include, but are not limited to: maleic anhydride/ethyl acrylate/vinyl acrylate, maleic acid/maleic anhydride/alkylvinyl ether, maleic acid/acrylic acid/nonionic, and maleic acid/ethyl acrylate/vinyl acetate. Examples of particularly suitable commercially...