Cyclometalated Ruthenium(II) Complexes as Highly Active Transfer Hydrogenation Catalysts

Abstract

Complexes of platinum group metals with PCP pincer ligands are currently being investigated in both stoichiometric and catalytic reactions.

Preparation and characterisation of a Ni2+/Co2+-cyclam modified mesoporous cellular foam for the specific immobilisation of His6-alanine racemase

“…Ruthenium based catalysts are widely applied in the field of hydrogenation 129,130 and racemization reaction of alcohols, amines and cyanohydrins due to their high selectivity 131,132 . There are many types of ruthenium catalysts depending on the ligand attached to the metal; the most active one is the Shvo-type catalyst 133 .…”

Diastereoselective Radical‐Type Cyclopropanation of Electron‐Deficient Alkenes Mediated by the Highly Active Cobalt(II) Tetramethyltetraaza[14]annulene Catalyst

“…B) Diazo compoundd imerisation towards alkenes via metal carbenoids. [7] [a] M. Sc unsaturated ester substrate. The larger the gap and the smaller the substituents,t he more favourable the 1,3-dipolar cycloaddition.…”

Synthesis, Coordination Chemistry, and Cooperative Activation of H2 with Ruthenium Complexes of Proton‐Responsive METAMORPhos Ligands

“…[2] The proton-responsive character is brought about by acidobasic moieties that can be reversibly deprotonated during catalytic turnover, thereby allowing bioinspired bifunctional substrate activation and conversion. [3] More recently, dehydrogenations and dehydrogenative coupling reactions based on the same proton-responsive nature of suitable bifunctional metal-ligand combinations have been developed. In those reactions, the basic ligand abstracts a proton, and the metal center abstracts a hydride from the substrate.…”

“…Only the major conformation of the disordered n-butyl chain is shown. Selected bond lengths [Å] and angles [°]: Ru-P1 2.3096(4), Ru-P2 2.3466(4), Ru-O1 2.1485(11), Ru-C17 1.8293(16), Ru-Cl 2.4673(4), P1-N 1.6597(14), N-S 1.5435(14), S-O1 1.4911(13), S-O2 1.4416(14); P1-Ru-P2 100.15(2), P1-Ru-Cl 168.320(14), P2-Ru-Cl 86.773(14), O1-Ru-C17 174.02(5), P1-Ru-O1 82.39(3), P2-Ru-O1 93.54(3), N-S-O1 112.92(7), N-S-O2 113.44(8), Ru-C17-O3 176.64(14), P-N-S 119.30(9). Symmetry operation i: -x, y, 0.5z.…”

“…H NMR (400 MHz, CDCl 3 ): δ = 7.86-7.36 (12 H), 7.08 (d,3 J H,H = 8 3. Hz, 2 H, CH), 5.68 (d,3 J H,H = 6 3. Hz, 1 H, Ar cymene CH), 5.40 (d,3 J H,H = 6 4.…”