The crystal structure of the inner salt of 2-[(aminoiminomethyl)amino]ethylcarbamic acid [systematic name: (2-((diaminomethylene)ammonio)ethyl)carbamate], C₄H₁₀N₄O₂

Recent Advances in the Chemistry of Metal Carbamates

“…These systems are capable of absorbing significant amounts of CO2 (generally ≤ 1 equivalent) and spectroscopic data (IR, 13 C-NMR) agree with the formation of carbamates [117][118][119][120][121]. It is noteworthy that (2-ammoniumethyl)guanidinium dichloride reacts with Ag 2 CO 3 directly in water, affording the corresponding guanidinium carbamate in high yield (Scheme 11b) [116]. This is a rare example of indirect generation of a carbamate (i.e., not using CO 2 ) and where the superbase and the amine belong to the same molecule.…”

“…It is noteworthy that (2-ammoniumethyl)guanidinium dichloride reacts with Ag 2 CO 3 directly in water, affording the corresponding guanidinium carbamate in high yield ( Scheme 11 b) [ 116 ]. This is a rare example of indirect generation of a carbamate (i.e., not using CO 2 ) and where the superbase and the amine belong to the same molecule.…”