Citation: A. Viola et al., ACETYLENES AS POTENTIAL ANTARAFACIAL COMPONENTS IN CONCERTED REACTIONS - FORMATION OF PYRROLES FROM THERMOLYSES OF PROPARGYLAMINES, OF A DIHYDROFURAN FROM A PROPARGYLIC ETHER, AND OF AN ETHYLIDENEPYRROLIDINE FROM A BETA-AMINO ACETYLENE, Journal of organic chemistry, 58(19), 1993, pp. 5067-5075