Toluene → Phosphonium, tetrakis((methyl((methylamino)carbonyl)amino)methyl)-,chloride

Participants

Reaction Steps

A mixture of THPC (9.53 g, 0.05 mol), 1,3-dimethylurea (17.62 g, 0.20 mol), and toluene (75 ml) was heated to reflux in an apparatus fitted with a Dean-Stark trap for azeotropic removal of the water. The mixture was held at reflux until the evolution of water ceased; 3.7 ml (0.20 mol) was collected in 1 hr., and no more passed over in the next hr. The product, which has separated during the reaction as a mass of white solids, was broken up, triturated under toluene, filtered, and dried, giving 22.8 g (97.2%) of tetrakis(1,3-dimethylureidomethyl)phosphonium choride (I, R=R'=CH3, R"=H, X=Cl) as a white crystalline solid, mp 187°-189° C. dec. Two recrystallizations from 2-propanol (8 ml/g), followed by drying under vacuum for 2 hr at 56° C. (acetone), gave a 1:1 solvate of the product and 2-propanol, mp 194°-194.5° C. dec.

Provenance & Evidence