Selective preparation of unusual π-adducts of the functional arenes diphenylacetylene, phenol, and benzoic acid with the CpRu+ fragment (Cp = C5Me5)
Abstract
Protonation of [CpRu(OMe)]2(1) with CF3SO3H in tetrahydrofuran (THF) in the presence of methanol yields [CpRu(MeOH)3](CF3SO3)(2); (2) or the reaction mixture (1)+ CF3SO3H reacts with one or half an equivalent of diphenylacetylene, benzoic acid, and phenol to give, respectively, [CpRu(η6-PhCCPh)](SO3CF3)(3), [(CpRu)2(η6, η6-PhCCPh)](SO3CF3)2(4), [CpRu(η6-PhCO2H)](SO3CF3)(6), and [CpRu(η6-PhOH)](SO3CF3)(8), whereas the direct reactions of (1) with phenol and benzoic acid yield, respectively, [CpRu(η5-PhO)](7) and the zwitterionic derivative [CpRu(η6-PhCO2)](5); the facile interconversion (5)â†�→(6) and (7)â†�→(8) was demonstrated by 1H NMR.