Supramolecularly controlled surface activity of an amphiphilic ligand. Application to aqueous biphasic hydroformylation of higher olefins

The dual role of cis-[RuCl2(dmso)4] in the synthesis of new water-soluble Ru(II)–phosphane complexes and in the catalysis of redox isomerization of allylic alcohols in aqueous–organic biphasic systems

“…[25] Coordination properties of alkyl-pta derivatives and catalytic applications of their complexes received less attention than those of pta. Rare examples include the use of (pta-Bn)Cl (Scheme 1) in Rh-catalyzed hydroformylation of higher olefins [26,27] and that of [(η-arene)RuCl2(pta-Bn)]Cl in hydration of nitriles. [28] [CpRuCl(pta-Me)2](OSO2CF3)2 and [CpRu(pta-Me)2(H2O)](OSO2CF3)3 were found effective catalysts of the redox isomerization of allylic alcohols.…”

Hydroformylation in Aqueous Biphasic Media Assisted by Molecular Receptors

“…More precisely, a biphasic catalytic system has been elaborated in which the amphiphilic species concentrations at the aqueous/organic interface could be thermocontrolled by the supramolecular interaction between β-CDs and an appropriate ligand, namely the 1-(4-tert-butyl)benzyl-1-azonia-3,5-diaza-7-phosphaadamantyl ligand (N-t-BuBz-PTA, Fig. 20) [84]. An increase in the catalytic activity was observed without alteration in either the chemo-or the regioselectivity.…”

Lower- and upper-rim-modified derivatives of 1,3,5-triaza-7-phosphaadamantane: Coordination chemistry and applications in catalytic reactions in water

“…At the end of the catalytic run, by decreasing the temperature a lower proportion of non-included phosphine should be present in the reaction mixture, with a drop of the surface activity, thus favoring decantation between the aqueous and organic phase (Fig. 1) [16].…”

“…The results were compared with the benchmark TPPTS as water-soluble phosphine. 1-Decene has been mostly used as model substrate for its hydrophobic character, although higher terminal olefins were also tested [14,16]. The reactions were performed in water at various temperatures using [Rh(acac)(CO) 2 ] as metal precursor, under 50 bar CO/H 2 for 6 h. Selected results are summarized in Table 4.…”