ABSTRACT
The molecular ion at m/z 158 is the base peak of the spectrum (MS), together with the fragment at 129 (M-29). In spite of the presence of abundant peaks corresponding to losses of 15 (m/z 143), 29 (m/z 129), and 43 mass units (m/z 115), the high stability of the molecular ion and the presence of M-28 suggest that we are not dealing with a long linear compound. In addition, peaks such as m/z 77 and 51 are typical in benzenoid compounds. The calculation of the molecular formula from the molecular mass using the rule of thirteen initially provides a hydrocarbon with formula C12H14, whose degree of unsaturation is 6.
