1.
Org Biomol Chem
; 11(21): 3558-67, 2013 Jun 07.
Artigo
em Inglês
| MEDLINE
| ID: mdl-23613125
RESUMO
On deprotonation, 1-arylindazolium salts form 1-arylindazol-3-ylidenes which rearrange spontaneously via ring cleavage, ring closure and subsequent proton transfer to substituted 9-aminoacridines. By contrast, the N-heterocyclic carbene of 2-phenylindazolium cannot rearrange similarly and was trapped by sulfur.
Assuntos
Aminacrina/química , Indazóis/química , Metano/análogos & derivados , Ciclização , Metano/química , Estrutura Molecular , Paládio/química
2.
Chem Commun (Camb)
; 50(80): 11822-4, 2014 Oct 14.
Artigo
em Inglês
| MEDLINE
| ID: mdl-25156208
RESUMO
Deprotonated sydnones, which can be represented as anionic N-heterocyclic carbenes, were prepared as Li adducts and compared with deprotonated O-ethylsydnones (5-ethoxy-1,2,3-oxadiazol-4-ylidenes) which belong to the class of abnormal NHCs. The Pd complexes of the sydnone anions (X-ray analysis) as well as of the O-ethylsydnone carbenes proved to be efficient catalysts in aryl couplings of thiophenes.