Veltmann Reaction

Veltman reaction - (o. W) - a substance that forms compounds with various compounds (in particular, replaces the -OH, NH or -COOH group) and changes the color of the solution [1]. According to the international nomenclature of chemical substances, it is designated as o-toluidine, toluylaldehyde. Veltman's reagent is highly soluble in benzene, alcohol, ether, chloroform, water and other organic solvents, as well as ammonia. Cooled solutions of the reagent cause temporary precipitation of crystals of manganese tricarbonylmethanates. If the mixture is heated, the precipitate again turns into a colorless transparent state; the amount of solution in this case does not change. Veltman studied synerite and a number of organic compounds in the period from 1880 to 1928. It has been found that in cases where synergitis