The mass spectra of 1‐arylanthra‐9,10‐quinones

The mass spectra of 1‐phenylanthra‐9,10‐quinone and 20 substituted l‐phenylanthraquinones having alkyl methoxyl, nitro and halogen substituents in the o‐, m‐ and p‐positions of the phenyl ring have been measured. The spectra are discussed with particular reference to the loss from the molecular ion of a hydrogen atom and of the substituent.