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Communication | Regular issue | Vol 29, No. 4, 1989, pp.629-634
Published online, 1st January, 1970
DOI: 10.3987/COM-89-4660
Mass Spectrometric Evidence for Formation of the 2-Carbonyl-2H-indole Intermadiate

Mitsuo Akiba,* Takanobu Maejima, Toyozo Takada, and Yasuo Shida

*School of Pharmacy, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan


The mass spectra of indole-2-carboxylic acid derivatives were investigated. In particular, indole-2-carboxylic acids with good leaving groups were noted to undergo the thermal rearrangement in the ion source of the mass spectrometer to form a ketene and a ketene dimer.