Hydroxymethaaefbiol, HOCHaH, was as- sumed by Bawnano' to be formed as an unstable intermediate on treating formaldehyde with hy- drogen sulfide, and he showed that the reaction proceeds to insolubk tsithhfosmaldehyde, HCHO + H2S -+ HOCHaSH + (CH2S)a. Since tri- ... Another method, however, was successful. When piperidine was added to formaldehyde and the 1-piperidinemethanol thus obtained treated with hydrogen sulfide, a vigorous reaction with strong evolution of ...