77951-63-4Relevant articles and documents
New Intramolecular Cycloaddition Reactions of Mesoionic 1,3-Dithiolones
Gotthardt, Hans,Huss, Otmar M.
, p. 347 - 353 (2007/10/02)
The syntheses and spectroscopic data of the new mesoionic 1,3-dithiolones 4, 5 and 6 are described.As a cyclic thiocarbonyl ylid which contains a non-activated olefinic function in the same molecule 5 yields at 120 deg C the tetracyclic primary adduct 7 (90percent) due to intramolecular cycloaddition.On the other hand, the analogous reaction of 6 produces the thiophene derivative 9 (92-96percent yield) by concomitant evolution of COS from the intramolecular primary adduct 8.