Arene ruthenium oxinato complexes: Synthesis, molecular structure and catalytic activity for the hydrogenation of carbon dioxide in aqueous solution

Quinoline‐Conjugated Ruthenacarboranes: Toward Hybrid Drugs with a Dual Mode of Action

“…Activation of the carboxylic group of 3 with di‐ tert ‐butyl dicarbonate (Boc 2 O), in CH 2 Cl 2 /pyridine, followed by reaction with sodium quinolin‐8‐olate (or [(7‐chloroquinolin‐4‐yl)oxy]butanol‐1‐ate), yielded ruthenacarborane esters 4 and 5 , in 18 % and 21 % yield, respectively. 8‐hydroxyquinoline (8‐HQ) was chosen due to the plethora of studies which combine a ruthenium(II)‐arene fragment with 8‐HQ, and [(7‐chloroquinolin‐4‐yl)oxy]butanol because of its structural similarity to CQ, but still suitable for the synthesis of an ester bond. The low yields of isolated final products can be attributed, at least partially, to the instability of the carborane‐bound ester bonds on chromatography columns (see also ester 6 (19 %)), as we have frequently observed in our group, for both ester and amide bonds (see for example ref.…”

Recent advances in catalytic hydrogenation of carbon dioxide

“…A series of Ir and Ru complexes have been exploited for CO 2 hydrogenation to formic acid or formate in alkaline aqueous solution. [269][270][271][272][273]283,284 The catalysts containing the stronger electron donor ligands could accelerate the reaction. 270,283 Ir complex prepared by Himeda et al is homogeneous and highly reactive at the beginning of the reaction; however, it turns into heterogeneous and deactivates at the end of the reaction.…”

“…A plausible mechanism has been discussed where a catalytic cycle for CO 2 hydrogenation by Ir or Ru complexes involves a hydrido complex formed in situ from the corresponding aqua or chloro complexes (Scheme 13). 269,271,272 CO 2 inserts into the hydrido complex to give the corresponding formyl complex, which then reacts with hydroxide to produce the formate anion.…”

Water decontamination with hydrogen production using microwave-formed minute-made ruthenium catalysts

“…Ruthenium arene complexes have been widely used in the field of homogeneous catalysis for many years and have been employed for applications as varied as asymmetric transfer hydrogenation 8 through to the functionalization of aqueous carbon dioxide. 9 One of the key reasons for their ubiquitous nature in catalysis is the robustness of the compounds formed; this is due to the strong arene-ruthenium bond. This stability coupled with a plethora of inexpensive and readily available aryl ligands, many of which are frequently sourced from natural products, gives rise to a wide availability of versatile potential catalysts.…”