Technical Introduction: n-Octylbenzene-d22 n-Octylbenzene-d22 is a deuterated aromatic hydrocarbon, where 22 hydrogen atoms are replaced with deuterium, resulting in enhanced stability and reduced interference in spectroscopic applications. This isotopically labeled compound is particularly valuable in nuclear magnetic resonance (NMR) spectroscopy and mass spectrometry (MS), serving as an internal standard or solvent for precise analytical measurements. Its high isotopic purity (>98% D) ensures minimal signal overlap, improving data accuracy in structural and kinetic studies. Additionally, n-Octylbenzene-d22 exhibits excellent chemical inertness, making it suitable for use in controlled reaction environments. Its consistent performance supports research in organic chemistry, materials science, and deuterium-labeling experiments.