Mass spectra of monosubstituted trans‐stilbenes

The mass spectra of twenty‐eight monosubstituted trans‐stilbenes in ortho, meta, para and alpha positions with N(CH3)2, NH2, OCH3, OH, Br, Cl, F, CH3, COOH, CN and NO2 groups as substituents have been studied. A detailed fragmentation pathway is given for stilbene. This fragmentation, characteristic for most of the substituted stilbenes, takes place either from the molecular or from the [M ‐ Substituent] ion. In o‐nitro‐, o‐methoxy‐,α‐carboxyl‐ and α‐methylstilbene, however, rearrangement reactions prior to fragmentation influence the fragmentation pattern.