In paper1the chemical shift of carboxylic proton at low temperature of the carboxylic acids dissolved in n-hexane have been found to be equal to the chemical shift of the cyclic dimers. It is quite possible that at low temperature the exchange process cyclic dimer-monomer-complex may cease in the system carboxylic acid-electrondonating solvent. The study of the temperature dependence of chemical shift of the carboxylic proton may partially elucidate this.