Transfer hydrogenation and transfer hydrogenolysis. IX. Hydrogen transfer from organic compounds to aldehydes and ketones catalyzed by dihydridotetrakis(triphenylphosphine)ruthenium(II)

Kinetic study of hydrogen transfer from benzyl alcohol to aliphatic aldehydes catalysed by heterogenised ruthenium(II) catalysts

“…The reason was that the coordination power of aldehyde was strong therefore the hydrogen donor was not able to reach the metal site at higher aldehyde concentration. This was supported by the observation that the reaction rate constant did not decrease with the addition of the triphenylphosphine over the range of 0.02-1 M. The evidence of strong coordination ability of aldehyde was also reported by Imai et al (1976) when they used spectroscopic techniques to investigate hydrogenation of aldehydes and ketones. …”

“…In the catalytic transfer hydrogenation of aldehydes and ketones to alcohols, using primary and secondary alcohols as hydrogen donors, transition metal salts (Haddad et al, 1964(Haddad et al, , 1974Gullotti et al, 1971), CoH 3 (PPh 3 ) 3 (Malunowicz and Tyrlik, 1974), RhCl 2 (PPh 3 ) 3 (Orr et al, 1970), RuCl 2 (PPh 3 ) 3 (Sasson et al, 1974), IrCl 3 [P(OMe) 3 ] 3 (Eliel et al, 1970), and RuH 2 (PPh 3 ) 4 (Imai et al, 1976) have been reported to have activities as homogeneous transition metal catalysts. Recently, the transfer hydrogenation of aldehydes and ketones were reported by many researchers by using different catalyst systems.…”

Transfer Hydrogenation Including the Meerwein‐Ponndorf‐Verley Reduction

“…Cyclic ethers such as [1,4]dioxane (39) and 2,3-dihydrofuran are known to donate a pair of hydrogen atoms to this type of compound. 2,3-Dihydro- [1,4]dioxine (41), the product of dioxane (39), is not able to donate another pair of hydrogen atoms [46,60,73,74]. These heterocyclic compounds are in general also very good solvents for both the catalyst and the substrates.…”

“…In particular, indan and tetralin, which are able to form conjugated double bonds or a fully aromatic system, are used [74].…”

Katalytische Oxidation von organischen Substraten durch molekularen Sauerstoff und Wasserstoffperoxid über einen mehrstufigen Elektronentransfer – ein biomimetischer Ansatz

“…[62] Cole-Hamilton und Morton berichteten, [61a] [64,65] Die Tatsache, dass Rutheniumkomplexe als Dehydrierungs-und Hydrierungskatalysatoren fungieren können, spiegelt sich in ihrer Anwendung in Wasserstofftransferreaktionen wider. [66] In diesen Reaktionen dehydriert das Ruthenium den Alkohol, und das ge- Das biomimetische Katalysatorsystem wurde auch auf die aerobe Oxidation von sekundären Alkoholen angewendet. [68] Als substratselektiver Redoxkatalysator diente dabei der dimere Rutheniumkatalysator 3, der in die zwei Hälften 4 und 5 dissoziiert.…”