Revisitation of Formaldehyde Aniline Condensation. VIII - Monomeric N-Methylene Anilines

A convenient, high yield "dry" method pf the synthesis of monomeric N-methyleneanilines and the characterization of the products by MS, 1H and 13C-NMR and IR are reported, improving previous procedures and describing new compounds. It appeared that the existence of monomeric N-methyleneanilines is strictly related to the presence of enough steric hindrance to oligomerization by substituents in ortho positions