Proton transfer processes of 4-methyl-2,6-dicarbomethoxyphenol (CMOH) have been investigated by means of absorption, emission and nanosecond transient spectroscopy in some polar aprotic solvents at room temperature and 77 K. Unlike MFOH, CMOH does not show any phosphorescence spectra by lowering the temperature at 77 K in any of the pure solvents studied here. The fluorescence decay rates of CMOH are relatively faster compared to those of 4-methyl-2,6-diformylphenol (MFOH) and nonradiative decay rates are dominant over the proton transfer processes.