POLYMERIC PROTECTING GROUPS .5. POLYMERIZABLE UREA COMPOUNDS WITH 2-METHYLPROPYLOXYCARBONYL FUNCTION AS A MODIFIED TERT-BUTOXYCARBONYL-TYPEAMINO-PROTECTING GROUP

inocarbonyloxy)-2-methylpropyl]-3-methacryloylurea (4) was prepared by addition of 1-(2-hydroxy-2-methylpropyl)-3-methacryloylurea (3) to 4- chlorophenyl isocyanate as a model compound. The new monomer 4 acts as a modified tert-butoxycarbonyl (BOC)-type amino-protecting group whic h can be homopolymerized and copolymerized with methyl methacrylate (M MA) upon radical initiation. The kinetics of the deprotection of the a romatic amine under acidic conditions which leads to the formation of ethacryloylamino-5,5-dimethyl-DELTA2-1,3-oxazoline (7) was followed by means of H-1 NMR spectroscopy.