1,3-Dipolarcycloaddition of azolium N-dicyanomethylides, which have an azomethine ylide structure, to acetylenic dipolarophiles affords azolopyridine derivatives. The initial cycloadduct has been isolated for the first time. Using unsymmetrical dipolarophiles, only one of the two possible regioisomers has been obtained. The orientation problem has been approached theoretically by a second-order perturbational
Reactivity of tetracyanoethylene oxide toward heteroaromatic compounds. Synthesis and structure of heterocyclic dicyanomethylides
作者:Enrique Diez-Barra、Maria Del Carmen Pardo、Jose Elguero
DOI:10.1021/jo00144a004
日期:1982.11
DIEZ-BARRA, E.;PARDO, M. DEL, C.;ELGUERO, J., J. ORG. CHEM., 1982, 47, N 23, 4409-4412
作者:DIEZ-BARRA, E.、PARDO, M. DEL, C.、ELGUERO, J.
DOI:——
日期:——
DIEZ-BARRA, E.;PARDO, C.;ELGUERO, J.;ARRIAU, J., J. CHEM. SOC. PERKIN TRANS., 1983, N 9, 1317-1320
作者:DIEZ-BARRA, E.、PARDO, C.、ELGUERO, J.、ARRIAU, J.
DOI:——
日期:——
10.1002/ejoc.202400163
作者:Kahnert, Sean Ray、Namyslo, Jan C.、Rissanen, Kari、Nieger, Martin、Schmidt, Andreas
DOI:10.1002/ejoc.202400163
日期:——
Imidazolium-ylides are conjugated mesomeric betaines with an exocyclic anionic carbon substituent. These ylides were converted by deprotonation into anionic N-heterocyclic carbenes, which can be formulated with two negative charges on the carbene carbon atom due to their origin. Subsequent reaction with selenium gave anionic selenourea compounds.