Abstract
Abstract The rate of formation of methyl carbamate has been measured by a determination of the HNCO concentration. It can be expressed as follows: rc=kc[HNCO][H+]. This rate equation was confirmed in the concentration range of HCl(0.76–1.53×10−3 mol dm−3). Consequently, this reaction was subjected to a proton catalysis. However, at a H+ concentration lower than 4×10−4 mol dm−3, the observed rate was lower than that calculated by the rate equation, especially at a high HNCO concentration. This was explained by a reduction of the free HNCO concentration due to an association of HNCO with the formed carbamate.
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