Abstract: Studies on EIMS of the Derivatives of 2,4,6-trisubstuted PyrimidinesYu Jianxin; Liu Fangming;Liu Yuting(Department of Chemistry,Xinjiang University,Ulumuqi 830046,China)Received Abstract:This paper reports the electron ionization mass spectra(EIMS)of eight 2,4,6trisubstituted pyrimidines derivatives.Their fragmentation patterns including hydrogen atom transferation and retro Diels-Alder cleavage as well as the refragmentation of pyrimidine ring are also proposed.Keywords:trisubstituted pyrimidine;mass spectra;fragmentation