Ruthenium(II)-Catalyzed C–H (Hetero)Arylation of Alkenylic 1,<i>n</i>-Diazines (<i>n</i> = 2, 3, and 4): Scope, Mechanism, and Application in Tandem Hydrogenations
C–H bond arylation. Mixtures of E:Z isomeric products were observed in some cases, which were further hydrogenated in a tandem manner in the presence of the remaining rutheniumcatalyst from the first step, representing an alternative approach to more difficult C(sp3)–H bond functionalization. According to mechanistic studies, the unexpected E:Z product formation seems to occur by thermal C═C bond isomerization