Abstract
An experimental and a theoretical study have been undertaken on the very large fragment ion of m/z 97 observed in the mass spectra of dimethyl disulfide (DMDS) derivatives of methyl esters. A structure for this ion and the corresponding fragmentation pathway have been proposed. This fragment ion is present only when one methylene group separates the double bonds and only if the compounds contain an ester function. The presence of this fragment ion allows the easy location of the double bonds.
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