The structure of the principal condensation product between ethylenediamine and formaldehyde is not 1,3,6,8-tetra-azatricyclo[6,2,1,13,6]dodecane (I) but is 1,3,6,8-tetra-azatricyclo[4,4,1,13,8]dodecane (II), the molecules of which show an interesting inversion process both in the solid and in solution.
F. G. Riddell and P. Murray-Rust, J. Chem. Soc. D, 1970, 1075 DOI: 10.1039/C29700001075
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