The title compounds, the first examples of bridged ten-π-electron [9]annulenes, were formed by the reaction of benzocylopropene with a mesoionic oxathiazolone and dithiolone; 9-phenyl-3-8-methano-1,2-thiazonine is unstable, and its formation was deduced from its n.m.r. spectra.
H. Kato and S. Toda, J. Chem. Soc., Chem. Commun., 1982, 510 DOI: 10.1039/C39820000510
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