Dendrimer-based catalysts in Wacker-oxidation: Unexpected selectivity to terminal double bonds

Thermo-responsive Ruthenium Dendrimer-based Catalysts for Hydrogenation of the Aromatic Compounds and Phenols

“…It should be noted, that such increase in activity along with the temperature rising up to the LCST reached, is typical for some catalysts, based on PPI dendrimers or modified PEGs in presence of hydrophobic substrates [49,65]. The broad plateau at 65-90°C for PPI-dendr-PEG-Ru-20 may be attributed to poly(ethylene oxide) linkers influence.…”

“…Due to the latter, as well as a large number of donor coordinating groups and the great possibilities for the modification of surface groups, specifying ligand solubility in the reaction medium and substrate affinity, dendrimers have already found their application in catalysis [32][33][34][35], in particular, in the hydrogenation of alkenes [36][37][38][39][40], aromatic compounds [36,41] and phenols [42], semihydrogenation of alkynes [43][44][45] and dienes [39,[43][44][45][46][47], hydroformylation [48], Waker oxidation [49], cross-coupling [40,[50][51][52][53][54][55][56][57] and oxidative coupling [58] reactions. Homogeneous dendritic catalysts can be repeatedly used, first of all, by their separation in the second phase, when the appropriate solvent is added [35,37,42,44,49,55,59], or cooling the reaction mixture below upper critical solution temperature (UCST) [33,43,50].…”

Dendrimer‐Encapsulated Pd Nanoparticles, Immobilized in Silica Pores, as Catalysts for Selective Hydrogenation of Unsaturated Compounds

“…Isomerization of the C=C double bond position is the typical process for linear alkenes in the presence of Pd catalysts . It was especially noticeable for the products of less‐size 1‐hexyne hydrogenation (Table S4).…”

Preparation and Characterization of Novel Poly(alkylidenamine) Nitrile Ruthenium Metallodendrimers

“…The first one was the elongation of the carbon chain between the N-N atoms of the amine core. The carbon chain was increased from two carbon atoms on the N,N,NЈ,NЈ-[tetrakis (cyanoethyl) The synthesis of 4 was recently reported [10] while the preparation of this manuscript was under way, although no experimental details or spectroscopic characterization of the compound were given. The new N,N,NЈ,NЈ-[tetrakis-(cyanoethoxypropyl)hexamethylenediamine] (7) was prepared by adapting a reported methodology presented by Jayaraman et al [14] The precursor [OtBu(C=O)(CH 2 ) 2 ] 2 -N(CH 2 ) 6 N[(CH 2 ) 2 (C=O)OtBu] 2 (5) was synthesized by Michael addition of tert-butyl acrylate, followed by tertbutyl ester reduction to give the tetrol [OH(CH 2 ) 3 ] 2 N-(CH 2 ) 6 N[(CH 2 ) 3 OH] 2 (6).…”

“…To the best of our knowledge, the other few examples in the literature that report the direct use of nitrile poly(alkylidenamine) cores refer to the synthesis of coordination polymers [9] and to the preparation of catalytic dendritic systems formed in situ for Wacker oxidation of terminal olefins bonds. [10] As part of our studies on the exploitation of the π donor ability of [Ru(η 5 + for the preparation and characterization of mono-, di-and trinuclear complexes [11] and metallodendrimers [8,12] for nonlinear optical applications using the nitrile group as a coordination bridge to the metallofragments, we wish to report herein our new findings on the preparation and characterization (by NMR, TOF-MS and FTIR) of the first generation of N,N + at the periphery. Although these metallodendrimers can potentially be used in catalysis, and even in biological applications, synthetic strategies for the preparation of low and high generations of nitrile-functionalized poly(alkylidenamine) ruthenium dendrimers remain practically unexplored.…”