Abstract: Mass Spectra of 1,2,4-Trimethoxybenzene and Three Mono-Deuteromethoxy-1,2,4-TrimethoxybenzenesZou Jianping;Nakayama Mitsuru; Zhen Keyue (Department of Chemistry, Suzhou University, Suzhou 215006,China) Abstract:The mass spectral fragmentation of 1, 2, 4-trimethoxybenzene and three monodeuteromethoxybenzenes was investigated. The fragmentation process was proposed on the basis of the high resolution mass spectrometry and the B/E linked scan spectra. It is obvious that the cleavage sequences of three methyl of 1,2,4-trimethoxybenzene(Ⅰ) are 1, 4, and 2 methyl radical by the results of three monodeuteromethoxy 1, 2, 4 trimethoxybenzenes(Ⅱ,Ⅲ ,Ⅳ). Keywords: 1,2, 4-trimethoxybenzene, EIMS, fragmentation