Organic ions in the gas phase. Part XX. Mass spectra of phenylthiophenes

The mass spectra of 2- and 3-phenylthiophenes and their phenyl-d₅ counterparts reveal that the thienyl ring is markedly more reactive than the phenyl ring under electron impact. In one process, that leading to loss of C₂H₂S, the atoms lost are apparently derived solely from the thienyl ring, quite probably from the original molecular configuration.