N. Narender et al., Intermolecular cyclization of diethanolamine and methylamine to N,N '-dimethylpiperazine over zeolites under high pressure, J CATALYSIS, 202(2), 2001, pp. 430-433
Synthesis of N,N ' -dimethylpiperazine via intermolecular cyclization of di
ethanolamine and methylamine has been investigated under high pressure cond
itions using zeolites and montmorillonite K10 for the first time. The HZSM-
5(30) is particularly effective for N,N ' -dimethylpiperazine formation and
the catalyst can be reused many times without significant loss of activity
. (C) 2001 Academic Press.