title: Silver(I) complexes of tris(pyrazolyl)borate ligands bearing six trifluoromethyl and three additional electron-withdrawing substituents.
abstract: Sodium salts of two new tris(pyrazolyl)borates [HB(4-Cl-3,5-(CF3)2Pz)3](-) and [HB(4-(NO2)-3,5-(CF3)2Pz)3](-), which are not only highly fluorinated, but also loaded with additional electron-withdrawing substituents, have been synthesized by reacting 4-Cl-3,5-(CF3)2PzH or 4-(NO2)-3,5-(CF3)2PzH with NaBH4 under nitrogen in a solventless process, and isolated after a work up in tetrahydrofuran (THF) or diethyl ether (Et2O), as their THF or Et2O adducts. Metathesis of these sodium salts with AgOTf in THF leads to [HB(4-Cl-3,5-(CF3)2Pz)3]Ag(THF) and [HB(4-(NO2)-3,5-(CF3)2Pz)3]Ag(THF). The corresponding cis-cyclooctene (c-COE) complexes [HB(4-Cl-3,5-(CF3)2Pz)3]Ag(c-COE) and [HB(4-(NO2)-3,5-(CF3)2Pz)3]Ag(c-COE) were obtained by displacing THF with cis-cyclooctene. The related [HB(3,5-(CF3)2Pz)3]Ag(c-COE) can also be obtained via a similar process. X-ray crystal structures show that [HB(4-(R)-3,5-(CF3)2Pz)3]Ag(c-COE) (R = H, Cl, NO2) feature pseudo-tetrahedral silver sites supported by κ(3)-bound tris(pyrazolyl)borate ligands. [HB(4-(NO2)-3,5-(CF3)2Pz)3]Ag(c-COE) displays the smallest upfield shift of the alkene carbon peak (versus free alkene) followed by [HB(4-Cl-3,5-(CF3)2Pz)3]Ag(c-COE) and [HB(3,5-(CF3)2Pz)3]Ag(c-COE). Experimental and computational data indicate very electron poor silver(I) sites in all three [HB(4-(R)-3,5-(CF3)2Pz)3]Ag(c-COE) adducts with minimal Ag → (cis-cyclooctene) backbonding. Although the impact of R (H, Cl, NO2) on the alkene carbon chemical shift of these adducts and the olefin π/π* populations is small, the (13)C NMR chemical shifts and NBO analysis suggest that [HB(4-(NO2)-3,5-(CF3)2Pz)3]Ag(c-COE) possesses the most electrophilic metal site, which correlates with the pKa values of the free pyrazoles. [HB(4-(R)-3,5-(CF3)2Pz)3]Ag(c-COE) adducts effectively catalyze the insertion of the carbene moiety of ethyl diazoacetate into C-H bonds of 2,3-dimethylbutane. The [HB(4-(NO2)-3,5-(CF3)2Pz)3]Ag(c-COE) catalyst shows a higher selectivity for primary C-H bonds compared to the reactions catalyzed by [HB(3,5-(CF3)2Pz)3]Ag(c-COE).
authors.affiliation: Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas 76019, USA. dias@uta.edu.
authors.forename: Naleen B
authors.initials: NB
authors.lastname: Jayaratna
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Pardue
authors.forename: Sriparna
authors.initials: S
authors.lastname: Ray
authors.forename: Muhammed
authors.initials: M
authors.lastname: Yousufuddin
authors.forename: Krishna G
authors.initials: KG
authors.lastname: Thakur
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Cundari
authors.forename: H V Rasika
authors.initials: HV
authors.lastname: Dias
mesh_terms: D001881:Borates / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D018360:Crystallography, X-Ray; D007536:Isomerism; D008024:Ligands; D008968:Molecular Conformation; D011720:Pyrazoles / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
chemical_list: D001881:Borates; D056831:Coordination Complexes; D008024:Ligands; D011720:Pyrazoles; C555951:tris(pyrazolyl)borate; D012834:Silver