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The mass spectrometric fragmentation of 1,8-bis[4-substituted(oxazolin-2-yl)] anthracenes(AnBOXes) was investigated by using mass-analyzed ion kinetic energy spectrometry under electron-impact ionization conditions. All the compounds could undergo a ring contraction by the loss of an RCH-CH_2 molecule to form 1-oxazirinyl-8-(oxazolin-2-yl) anthracene ions, which could further lose an R radical, followed by the loss of oxazoline. These ions could also eliminate an R radical and subsequently undergo ring-contraction rearrangements to lose a CHCH_2O fragment and an epoxide molecule, respectively. The ions that are formed could further lose CHCH_2O and CH_2-CH fragments. Se-veral ring-contraction rearrangements of the oxazoline ring were observed under electron-impact ionization conditions.
The mass spectrometric fragmentation of 1,8-bis [4-substituted (oxazolin-2-yl)] anthracenes (AnBOXes) was investigated by using mass-analyzed ion kinetic energy spectrometry under electron-impact ionization conditions. All the compounds could undergo a ring contraction by the loss of an RCH-CH_2 molecule to form 1-oxazirinyl-8- (oxazolin-2-yl) anthracene ions, which could further lose an R radical, followed by the loss of oxazoline. These ions could also eliminate an R radical and subsequent obligatory ring-contraction rearrangements to lose a CHCH 2 O fragment and an epoxide molecule, respectively. The ions that are formed that could even lose CHCH 2 O and CH 2-CH fragments. Se-veral ring-contraction rearrangements of the oxazoline ring were observed under electron-impact ionization conditions.