Results The addition reactions could be performed in a number of ways. The N, N-dichloro carbamate could be added dropwise to a cooled solution of the diene or vice versa. With gaseous butadiene it was found to be particularly advantageous simply to distil the material, after dilution with nitrogen, into a chilled solution of the N, N-dichloro carbamate. Removal of the solvent afforded near quantitative yields of monoadduct. The crude products were ...
