作者:Petrônio Filgueiras de Athayde-Filho、Joseph Miller、Alfredo Mayall Simas
DOI:10.1055/s-2000-7606
日期:——
Our studies indicate clearly that mesoioniccompounds are amphiphilic heterocyclic betaines - not aromatic - in which the separate positive and negative regions act as independent moieties. This was confirmed by the condensation of mesoioniccompounds with a structurally similar mesoionic hydrochloride forming "dimeric" products.
A new reaction of mesoionic 1,3,4-thiadiazoles. Attempted cycloaddition with dimethyl acetylenedicarboxylate
作者:Robert M. Moriarty、Anton Chin
DOI:10.1039/c3972001300a
日期:——
Treatment of various mesoionic 1,3,4-thiadiazoles with dimethyl acetylenedicarboxylate yields tetramethylthiophen tetracarboxylate and the S-cyanothioimidate derivative; a mechanism involving fragmentation of the mesoionic ring is suggested.