This study presents the calculation of stretching vibrational frequencies for the triatomic molecule dichlorine monoxide (Cl₂ O), explicitly focusing on the fourth, fifth, and sixth overtones. Using a Lie algebraic framework, a detailed mathematical modeling approach is provided to predict these higher overtone frequencies accurately. The results demonstrate the effectiveness of the Lie algebraic method in capturing the complex vibrational behavior of Cl₂ O, offering valuable insights into its vibrational spectra.