Mass Spectra of 2,8—Substituted—Aryl—Benzo—(1,2—b:5,4—b')Dipyran—4,6—Dione

Ten 2,8-Substituted-Aryl-Benzo-(1, 2-b: 5, 4-b')Dipyran-4, 6-Diones were determined by EI、HREI and EI-CA-MIKES (collision activated mass-analyzed ion kenetic energy spectrum). Their main fragmentations in mass spectrometry were discussed in comparasion with that of typical flavonoids. The mass spectra of these compounds have not appeared in the literature before.