PHOSPHINES SULFONEES ASYMETRIQUES V.^ACINETIQUE DE SULFONATION DES PHOSPHINES

Hydrophilic Ligands and Their Application in Aqueous-Phase Metal-Catalyzed Reactions

“…DPPE-TS ( L38a ), DPPP-TS ( L38b ), and DPPB-TS ( L38c ) (Table ) have all been prepared by sulfonation of the corresponding 1,ω-bis(diphenylphosphino)alkanes using oleum. The rate of sulfonation increases as the alkyl bridge becomes longer (DPPE < DPPP < DPPB) presumably due to the deactivating effect of the neighboring phosphonium salt . Herrmann’s boric acid protocol was used to prepare L38b in 90% yield and 98% purity .…”

Hydroformylation of 1-decene in aqueous medium catalysed by rhodium–alkyl sulfonated diphosphines system in the presence of methylated cyclodextrins. How the flexibility of the diphosphine backbone influences the regioselectivity

“…Methylation occurred at positions 2, 3, or 6 and 1.8 OH groups per glucopyranose unit were statistically modified. DPPETS, 13a,21 DPPPTS 21 or DPPBTS 21 was prepared as reported in the literature. 22 The purity of these diphosphines was carefully controlled.…”

Tetrasulfonated 1,2‐Bis(diphenylphosphanyl)ethane as a Building Block for the Synthesis of Disulfonated Alkyldiphenylphosphanes

“…To circumvent these difficulties, an alternative is to introduce the oleum‐sensitive group after the sulfonation step. We propose herein a new methodology to access disulfonated alkyldiphenylphosphane from tetrasulfonated 1,2‐bis(diphenylphosphanyl)ethane (DPPETS)8,9 and an alkyl halide. The desired water‐soluble phosphanes can be obtained by alkylation then cleavage of DPPETS.…”