Trifluoromethyl and heptafluoropropyl isocyanate have been syntliesised (u) by the Curtius reaction,(b) by controlled hydrolysis of perfluoro (methy1ene-alkylamines), and (c) by reaction of perfluoro (methylenealky1amines) with silica. Perfluoroalkyl carbamates are
[Hauptfleisch, John O.; Hennek, Matthew D.; Waterfeld, Alfred; Fernandez, Richard E.; Thrasher, Joseph S. Journal of Fluorine Chemistry, 2012 , vol. 133, p. 72 - 76]