η²-Alkene Complexes of [Rh(PONOP-ⁱPr)(L)]⁺ Cations (L = COD, NBD, Ethene). Intramolecular Alkene-Assisted Hydrogenation and Dihydrogen Complex [Rh(PONOP-ⁱPr)(η-H₂)].

ABSTRACT: Rhodium-alkene complexes of the pincer ligand κ³-C₅H₃N-2,6-(OPⁱPr₂)₂ (PONOP-ⁱPr) have been prepared and structurally characterized: [Rh(PONOP-ⁱPr)(η²-alkene)][BAr^F₄] [alkene = cyclooctadiene (COD), norbornadiene (NBD), ethene; Ar^F = 3,5-(CF₃)₂C₆H₃]. Only one of these, alkene = COD, undergoes a reaction with H₂ (1 bar), to form [Rh(PONOP-ⁱPr)(η²-COE)][BAr^F₄] (COE = cyclooctene), while the others show no significant reactivity. This COE complex does not undergo further hydrogenation. This difference in reactivity between COD and the other alkenes is proposed to be

SUBMITTER: Johnson A 

PROVIDER: S-EPMC8456414 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature