Recent breakthroughs in aqueous cyclodextrin-assisted supramolecular catalysis

Abstract

International audienceno abstrac

Rhodium catalyzed hydroformylation of 1-decene in low melting mixtures based on various cyclodextrins and N,N′-dimethylurea

“…DMU/CRYSME-β-CD 50 77 79 103 16 DMU/CRYSME-β-CD 70 69 71 β-CD was also without notable effect on the melting point (compare entries 2, 5, 9 and 10). So, the modification of the size or the chemical modification of CDs had no major impact on the melting points.…”

“…Indeed, one would think that an increase in CD amount would lead to an increase in conversion. Indeed in aqueous biphasic hydroformylation reaction, CDs are known to play the role of mass transfer agents by forming inclusion complexes with hydrophobic substrates at the interface [14][15][16]. As comparison, LMM based on DMU and α-D-methylglucopyranoside (70/30) was used and a conversion of 66% was reached.…”

Rhodium catalyzed aqueous biphasic hydroformylation of naturally occurring allylbenzenes in the presence of water-soluble phosphorus ligands

“…In this case, surfactants [13,14] or cyclodextrins [15,16] can be used as one of the most practical and effective strategies to avoid transfer limitations in aqueous/oil biphasic systems. Cationic surfactants provide the most significant effects in Rh/sulfonated phosphine systems as their positively charged moiety directed to the aqueous phase attract the anionic Rh complex to the water/organic phase interface where the catalyst meets the substrate.…”

Palladated halloysite hybridized with photo‐polymerized hydrogel in the presence of cyclodextrin: An efficient catalytic system benefiting from nanoreactor concept

“…The remarkable feature of CD that allows development of environmentally benign procedures in aqueous media is its capability for embedding hydrophobic substrates and transferring them to the aqueous media . Taking advantage of this feature, various aqueous biphasic catalysts have been developed …”