Solvent-free synthesis of 4,4′-diaminotriarylmethanes-leuco malachite materials in the presence of FePO4

A fast, efficient and versatile route for the synthesis of 4,4′-diaminotriarylmethanes is reported using N,N-dimethyl aniline and aryl aldehydes in presence of FePO4 under solvent-free condition at 100°C.