title: C-H activation of pyrazolyl ligands by Ru(II).
abstract: Previously, hydridotris(pyrazolyl)borate (Tp) Ru(II) alkyl and aryl complexes of the type TpRu(L)(NCMe)R (R = methyl or aryl; L = charge-neutral two-electron donating ligand) were demonstrated to activate aromatic C-H bonds. To determine the impact of replacing the anionic Tp ligand with charge-neutral poly(pyrazolyl)alkane ligands, [(C(pz)4)Ru(P(OCH2)3CEt)(NCMe)Me][BAr'4] (pz = pyrazolyl, BAr'4 = tetrakis[3,5-bis(trifluoromethyl)phenyl]borate) was prepared. Heating a C6D6 solution of [(C(pz)4)Ru(P(OCH2)3CEt)(NCMe)Me][BAr'4] with 1 equiv of NCMe resulted in C-H activation of the 5-position of a pyrazolyl ring to yield [(κ(3)-(N,C(5),N)C(pz)4)Ru(P(OCH2)3CEt)(NCMe)2][BAr'4] and CH4. Intramolecular C-H activation of the 5-position of a pyrazolyl ring also occurred when (η(6)-p-cymene)Ru(P(OCH2)3CEt)(Br)Ph was heated in the presence of C(pz)4 to yield [(κ(3)-N,C(5),N)C(pz)4]Ru(P(OCH2)3CEt)(NCMe)Br and C6H6. Density functional theory calculations revealed that the different reactivities of TpRu(P(OCH2)3CEt)(NCMe)R and [(C(pz)4)Ru(P(OCH2)3CEt)(NCMe)Me][BAr'4] result from the stronger binding of the Tp pyrazolyl rings to Ru(II) compared to that of C(pz)4.
authors.affiliation: Department of Chemistry, University of Virginia , Charlottesville, Virginia 22904, United States.
authors.forename: Evan E
authors.initials: EE
authors.lastname: Joslin
authors.forename: Brandon
authors.initials: B
authors.lastname: Quillian
authors.forename: T Brent
authors.initials: TB
authors.lastname: Gunnoe
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Cundari
authors.forename: Michal
authors.initials: M
authors.lastname: Sabat
authors.forename: William H
authors.initials: WH
authors.lastname: Myers