Bridged ten-π-electron nine-membered heterocycles: 9-phenyl-3,8-methano-1,2-thiazonine and 2,9-diphenyl-3,8-methanothionin
Abstract
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.