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The equilibrium C-H bond acidities of three cyclic carboxylic esters wherein the alkoxycarbonyl group is locked into an E conformation have been shown to be about 4 pKHA units greater than those of their acyclic analogues.Also, replacement of an alpha-methylene group in 2-indanone by an oxygen atom to form a cyclic ester of this type has been shown to cause an acidity increase of a comparable magnitude.These acidity increases are roughly one-half that observed for Meldrum’s acid, a similarly constituted cyclic diester, relative to that of an acyclic analogue, dimethyl malonate.A similar increase in the N-H acidity of an acyclic carbamate was found to occur when its alkoxycarbonyl moiety was locked into a five-membered (2-oxazolidone) ring.These structural changes were found to cause little or no change in the BDEs of the acidic C-H or N-H bonds in these esters or carbamates.On the other hand, introduction of a C=C bond into 2-oxazolidone caused a 15 kcal/mol decrease in BDE.
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 497-25-6 is helpful to your research. name: Oxazolidin-2-one
Reference：
Oxazolidine – Wikipedia,
Oxazolidine | C3H1203NO – PubChem