Revisitation of Formaldehyde Aniline Condensation. I High Yield Synthesis of 1,3,5‐Triphenylhexahydro‐symtriazine and its X‐Ray Crystal Structure Determination

A rapid and efficient preparation of 1,3,5‐triphenylhexahydro‐sym‐triazine ( 10 ) using paraformaldehyde is reported. The trimeric nature of the compound and its structure in solid state, where a biaxial chair conformation is favoured, are conclusively shown by X‐ray diffraction analysis. A recent report on a preparation of 1,3‐diphenyl‐1,3‐diazetidine is invalidated.