Synthesis and Catalytic Properties of New Water-Soluble Ruthenium(II)−N-Heterocyclic Carbene Complexes

Abstract

The new water-soluble complexes O, 1,3,5-triaza-7-phosphaadamantane (pta); n ) 0-2) catalyze the hydrogenation of various olefins, aldehydes, and ketones and the redox isomerization of allyl alcohol in aqueous solution under mild conditions and are suitable for the modification of lipid membranes by catalytic hydrogenation.

Catalytic Isomerization of Allylic Alcohols by (η6‐p‐Cymene)‐ Ruthenium(II) Complexes in Organic and Aqueous Media: New Recyclable and Highly Efficient Catalysts in Water Containing Ammonium‐Functionalized Ligands

“…This behavior contrasts with that of catalysts 2a -c in THF, which are totally inactive without base. Probably, the higher polarity of water vs. THF favors the dissociation of the chloride ligands in the catalysts [17] and the deprotonation of the allylic alcohol. b) In contrast to the catalyst 4c containing hexafluoroantimonate as counteranion, the related iodide compound [RuCl 2 (h 6 -p-cymene){k-(P)-P(OCH 2 CH 2 NMe 3 ) 3 }][I] 3 (3c) only leads to very low conversion (entry 11) indicating that the presence of a non-coordinative counteranion is crucial.…”

NEWLY DEVELOPED ANCHORED Ru(II)-N-HETEROCYCLIC CARBENE COMPLEX AND ITS APPLICATIONS

“…[3][4][5][6] A new water-soluble Ru-N-heterocyclic carbene (NHC) complex was recently prepared and applied in the hydrogenation of various starting materials, such as alkenes, aldehydes and ketones. [7] The …”

Unexpectedly fast catalytic transfer hydrogenation of aldehydes by formate in 2-propanol–water mixtures under mild conditions

“…Typical catalysts are [{RuCl 2 (mtppms) 2 } 2 ] [7], [RhCl(mtppts) 3 ] [7] or the in situ prepared Rh(I)-complexes with water-soluble thioligands, such as (l)-cysteine or (s)-captopril [20]. Hydrogenation of allylic alcohols may proceed via isomerization to aldehydes or ketones and in such cases the catalyst should be able to facilitate the hydrogenation of the C O function [34][35][36]. In general, it can be stated that the rhodium(I)-based catalysts are more active in hydrogenation of the C C bond, while the Ru(II)-complexes prefer hydrogenation of the C O bond.…”