Equilibrium Constants in the Ammonium Carbonate--Carbaminate System. The Acid Dissociation Constant of Carbamic Acid.

The Role of the Cyclic Imide in Alternate Degradation Pathways for Asparagine‐Containing Peptides and Proteins

“…As shown in Table 1, it is k 2 that seems to be lower in carbonate buffer, not k 3 . Previous reports on the formation of a carbamate adduct through the reaction of amines with carbonate in solution55–58 may be worth considering in attempting to account for this observation.…”

Investigations of primary and secondary amine carbamate stability by 1H NMR spectroscopy for post combustion capture of carbon dioxide

“…Enthalpy and entropy values derived from log 10 K 9 data for ammonium carbamate formation using a van't Hoff plot are also included [35] For the series of compounds investigated, several amines did not form carbamates under the conditions employed in the present studies (or could not be detected, such as AMP), and reasons for this are discussed below.…”

A calorimetric study of carbamate formation

“…Faurholt and Kong [17], Van Krevelen et al [18], and Christensson et al [19] have reported carbamate equilibrium constants between temperatures of (291 and 298) K, but the temperature range of these investigations is too narrow to reliably define the temperature dependency over a wider range. Kawazuishi has also reported temperature dependent constants for this system between (273 and 373) K, although these were values recommended by a colleague, and measurements and/or data are not reported [20].…”

“…This reaction is much less thoroughly investigated, most likely because this reaction is not predominant under conditions typically used for PCC. To our knowledge, the only measured carbamate protonation equilibrium constants available in the literature are for ammonium carbamate (log K = 6.76 at 298 K [19]) and MEA carbamate (log K = 7.49 at 303 K [24] …”