Jj. Vandeneynde et al., NOVEL SYNTHESIS OF HETEROCYCLES WITH N-(1-HALOALKYL)AZINIUM HALIDES .1. PREPARATION OF IMIDAZOLIDINES, Bulletin des Societes chimiques belges, 101(3), 1992, pp. 233-236
N-(1-Chloroalkyl)pyridinium chlorides, prepared from thionyl chloride,
pyridine, and an aldehyde, readily react with N,N'-disubstituted 1,2-
ethanediamine to yield imidazolidines under mild and neutral condition
s.