Nmr analysis of N-methoxymethylene-2-oxazolidone (4) in o-dichlorobenzene to-10" and deuteriochloroform to-30, with and without europium shift reagents (see Experimental Section), indicated that the exo-N-methylene protons were equivalent. Low-temperature analysis of N-butyl-5-phenoxymethylene-2-oxazolidone (2) in o-dichlorobenzene to-10" and deuteriochloroform to-30", with and without spin decoupling of the adjacent butyl ...
