Dual chirality control of palladium(ii) complexes bearing tropos biphenyl diamine ligands

Abstract

Axial and center chirality of Pd complexes with tropos biphenyl secondary diamine ligands is shown to be controlled by chiral amide (R)-DABNTf, which can efficiently discriminate between two enantiomeric Pd complexes.

A New Effective Synthesis of Arene Mono- and Disulfonyl Chlorides

“…Scheme 3 Conversion of disulfonyl chlorides 7 or 8 into the corresponding cyclic imides 9 or 10 To synthesize 7, we attempted the dixanthate pathway first. After successful reduction of 2,2¢-dinitrobiphenyl 16 and diazotization of the resulting 2,2¢-diaminobiphenyl, the Leuckart reaction of the corresponding tetrafluoro- borate unfortunately afforded only tar byproducts. It was therefore decided to synthesize a biphenyl derivative which bears two sulfur functionalities in 2-and 2¢-positions, using the Suzuki coupling reaction.…”

Chiral diphosphines and diphosphinites derived from 2,2-biphosphole: Stereodynamic ligands for asymmetric catalysis

“…Consequently, the design of new catalysts, based on dynamic chirality control (e.g., N-chirality control [6] or dual chirality control of axial and N-chirality [7]) by C. R. Chimie 13 (2010) In this account, the recent advances on chiral stereochemically dynamic 2,2'-biphosphole ligands for applications in asymmetric catalysis are reported.…”

“…Molecular view of R[Sp,Sp,Sc]-2a space group: P2 1 2 1 2 1 , Flack's parameter: 0.06(14) 7. p-donor substituents on the phosphorus of phospholes do not affect the activation barrier according to experimental measurements and calculations.…”

“…These compounds have been fully characterized and the molecular structures of 2a and 2b' have been established by X-ray diffraction. Compounds 2a and 2b' are enantiomerically pure in solid state according to X-ray diffraction analysis7 [15] (Figs. 3 and 4).…”

Chiral diphosphinites derived from 2,2-biphosphole as a new class of stereodynamic ligands for enantioselective hydrogenation

“…or dual chirality control of axial and N-chirality 8 ) by a chiral activator through complexation is an important field.…”