acid anhydrides

Summary: Acylated low molecular weight chitosans (LChA) were prepared from nucleophilic acylation of chitosan using acid anhydrides of short and medium chain length (4 - 10) to study the response of applied heat as a function of acyl chain length.

While investigating kinetics and interaction mechanism of epoxides with acid anhydrides in the presence of imidazoles, these imidazoles were shown to be comparable with tertiary amines in catalytic action.

groups in the molecule with one or more saturated polycarboxylic acids or acid anhydrides; the polyester acrylic polymer containing less than 10 weight percent aromatic content and having a number average molecular weight of 560-2500 and a viscosity less than 1500 cps at 70 weight percent NVM solids dispersed in 30 weight percent styrene based on the total weight of the polymer and the styrene; the polyester acrylic polymer blended with a polymerizable vinyl monomer.

The infrared technique employed also allowed for the quantitative analysis of the compound types absorbing in the carbonyl region of the IR spectra including carboxylic acids, dicarboxylic acid anhydrides, 2-quinolone type.

Chemical properties related to the carboxyl group: Introduction; Hydrolysis; Esterification; Acid chlorides, acid anhydrides and ketene dimers; Peroxy acids and esters; Long-chain alcohols; Acetals/ketlas and orthoesters; Nitrogen-containing compounds; Sulfonation and other reactions at the a-position; Barton reaction.

Synthesis of fatty acid anhydrides by reaction with dicyclohexylcarbodiimide.