Aminomethyl mercaptans

Similarly, aminomethyl sulphides (from amines, formaldehyde and mercaptans) react with organolithium compounds to afford amines (equation 40)n°4H... 

The reaction is catalysed by an organic base, usually an amine, which in the past has nearly always been the tertiary amine 2,4,6-tri(dimethyl aminomethyl) phenol. Such LP-modified epoxy resins have been in existence for more than 30 years. Their popularity declined because of the mercaptan odour of the polysulphide polymers in the uncured state and because of the use of a tertiary aromatic amine. 

Only a few a-alkylthiomethyl-3-pyrazolin-5-ones are known.1127 These have been prepared by reaction of mercaptans with 4-dimethyl-aminomethyl-2,3-dimethyl-l-phenyl-3-pyrazolin-5-one (eq. 137). These compounds are listed in Table XIV, Section E. 

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