ofmann (Ber., 4, 246. 1871.) found that triethylphosphine served as a catalyst to cause the polymerization of phenyl isocyanate to a dimer which he designated as diphenyl diisocyanate. Staudinger ("Die Ketene", Enke, Stuttgart, 1912, p. 126.) regarded this product as a four atomic ring derivative. It has now been found that triethylphosphine polymerizes a number of substituted phenylisocyanates, such as λ- and β-naphthyl isocyanates, and p-xenyl isocyanate. These products which have more recently been listed as derivatives of uretedione, react with aliphatic amines to produce substituted biurets.
Proceedings of the Iowa Academy of Science
©1942 Iowa Academy of Science, Inc.
Freyermuth, Harlan B. and Raiford, L. Chas.
"Formation and Properties of Some Uretediones,"
Proceedings of the Iowa Academy of Science, 49(1), 285-285.
Available at: https://scholarworks.uni.edu/pias/vol49/iss1/42