Attempts to obtain VII via the bis (isothiouronium) salt by the reaction of TTa with thiourea were unproductive. KO reaction took place when the reactants were refluxed in 2-propanol for 21 hr. When the reaction was attempted at 1.50'in dimethylformamide or propylene glycol, thiourea apparently underwent isomerization to ammonium thiocyanate6 at a rate greater than it reacted with T'a, since ammonium tosylate was the only product which ...
