Abstract
Mass spectra of substituted benzaldehydes, substituted benzyl ethyl ethers, diethyl substituted benzaldehyde acetals and substituted benzaldehyde ethylene acetals were measured by electron impact ionization. The substituted group of compounds were H; o-, m-, p-CF3O;o-, m-, p-CH3, and o-, m-, p-CI. The fragmentation patterns were discussed on the basis of the metastable ions and the fragment of isomer.