Solutions of phenylisocyanate (I) in DMF were stored at different temperatures in the presence of both polyurethane catalysts and 1,3-diphenylurea (11). The reaction products were determined by HPLC. Beside the hydrolysis of I to 11, a significant reaction of I with I1 to 1,3,5-triphenylbiuret (111) was observed at 20°C. Above 60°C I reacted with the solvent to form N,N-dimethyl-N'-phenylformamidine (V). In DMF, 111 dissociated to I and I1 already at temperatures >40"C. ZUSAMMENFASSUNG:Liisungen von Phenylisocyanat (I) in DMF wurden sowohl bei verschiedenen Temperaturen als auch in Gegenwart von Polyurethankatalysatoren und/oder 1,3-Diphenylharnstoff (11) gelagert. Die Reaktionsprodukte wurden mit Hilfe der HPLC quantifiziert. Neben der Hydrolyse von I zu I1 wird bei 20°C eine signifikante Reaktion von I mit I1 zu 1,3,STriphenylbiuret (111) beobachtet.Oberhalb 60 "C reagiert I mit dem Liisungsmittel zu N,N-Dimethyl-N'-phenylformamidin (V). In DMF dissoziiert 111 bereits bei Temperaturen > 40 "C zu I und 11.
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