Abstract
AbstractThe low energy (13 eV) electron‐impact and field desorption mass spectra of some photodimers of cinnamic acid and related compounds containing the cyclobutane ring are reported and the fragmentation patterns analysed in order to obtain stereochemical information on the substituent position on the cyclobutane ring. Both symmetrical and asymmetrical splittings of the cyclobutane ring were detected, allowing characterisation of the head‐to‐head and head‐to‐tail structures of the title compounds. A ring opening rearrangement of the McLafferty type was also found.
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