I'm not sure about that, it seems a lot of assumptions that really rely on experimentation. It does remind me of a route I proposed on here many years
ago. The convenience is that biurea has low solubility so easily separated.
H2N-CO-NH2 + Cl2 --> H2N-CO-NHCl
H2N-CO-NHCl + NH3 --> H2N-CO-NH-HN-CO-NH2 + H2N-CO-NH-NH2
H2N-CO-NH-HN-CO-NH2 + HNO2 --> H2N-CO-N3
H2N-CO-N3 + H2O --> NH4N3 + CO2
2NH4N3 + Pb(NO3)2 --> Pb(N3)2 + 2NH4NO3
I have made the carbamoyl azide above, but through semicarbazide. It is surprisingly stable and insensitive. I have not attempted the other reactions.
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