I CH, were prepared from the corresponding primary or secondary amines, or secondary diamines, by monoor dimethylation using formic acid-formaldehyde, accordiiig to the procedure of Eschweiler-ClarkeY (method B). The intermediate primary and secondary monoamines were obtained by reductive condensation of an aldehyde or ketone with ammonia or a primary amine in the presence of Raiiey nickel catalyst (method A). When a, ...