Dibutyltin oxide catalyzed aminolysis of oxalate
1,3-diphenylimidazolidine-2,4,5-trione;[29] 3d, ethyl N-(4-methyl-
phenyl) carbamate; 3e, ethyl N-(2-methoxyphenyl)carbamate;
3f, ethyl N-(2-chlorophenyl)carbamate;[30] 4d, ethyl N-(4-methyl-
phenyl) oxamate; 4e, ethyl N-(2-methoxyphenyl)oxamate;[11a]
4f, ethyl N-(2-chlorophenyl)oxamate;[3] 4i, methyl N-
methyloxamate;[12] 6, diethyl iminodicarbonate;[31] 10, N1,N2-
bis(2-chlorophenyl)oxalamide (GC-MS).[32] The 1H NMR and 13C
NMRspectrainCDCl3 wererecordedona200and500 MHzBrucker
instrument. Infrared (IR) spectra were recorded on a Perkin-Elmer
system 2000 infrared spectroscope. Samples for IR spectroscopy
were prepared employing a potassium bromide under normal
mode. GC-MS analysis was carried out on an instrument supplied
by Agilent, model 6890/5973N GC mass selective detector using
an HP-5 MS capillary column.
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