The results of liver perfusion experiments of Guggenheim and Loeffler (2) suggested that choline is oxidized to betainealdehyde (formylmethyltrimethyl ammonium ion). The products of reactions in vitro (3-6) exhibited the properties of betainealdehyde and betaine. It was shown that these products are formed by two enzymes of rat liver (7), choline oxidase of mitochondria (8, 9), and betainealdeh...

silica sulfuric acid is employed as solid acid catalyst for the clean and less hazardousprotection of carbonyl compounds as 2,4-dinitrophenylhydrazone under solvent-free conditions.

Silica sulfuric acid is employed as solid acid catalyst for the clean and less hazardousprotection of carbonyl compounds as 2,4-dinitrophenylhydrazone under solvent-free conditions.