Host-guest complexation. 8. Macrocyclic polyethers shaped by two rigid substituted dinaphthyl or ditetralyl units

Chiral Dirhodium Catalysts: A New Era for Asymmetric Catalysis

“…The substituted analogues at either 3,3'-positions [83,84] or 6,6'-positions [85][86][87][88] in the binaphtholyl ring were carried out by the same method through the ligand exchange of [Rh 2 (OAc) 4 corresponding substituted binaphtholhydrogen phosphate ligands [88][89][90][91] (Fig. 24).…”

“…The reduction of this chloro complex in aqueous KOH under an atmosphere of CO produced the neutral tricarbonyl complexes [Rh 2 (CO) 3 [32] b: R 1 = CH 3 , R 2 = H [85][86][87] c: R 1 = H , R 2 = Br [89,91] d: R 1 = H , R 2 = C 12 H 25 [90] 183a: [Rh 2 (R-BNP) 4 ], R 1 = H, R 2 = H [32] b: [Rh 2 (R-DMBNP) 4 ], R 1 = CH 3 , R 2 = H [83,84] c: [Rh 2 (R-DBBNP) 4 ], R 1 = H , R 2 = Br [88] …”

Recent advances in asymmetric oxidative coupling of 2‐naphthol and its derivatives

“…The exact structures for catalyst 32 are not clear yet, and mass analysis with FAB technique indicated that it was mainly composed of tetradentate monomer and pentadentate dimers. 47 Very recently, Gong and coworkers 53 reported H 8 -BINOL 62 based bimetallic chiral oxovanadium complexes 33 catalyzed oxidative coupling of 2-naphthols 22 using air as an oxidant. In the case of 22 bearing a substituent at C7 or two substituents at both C6 and C7, 33 demonstrated comparable efficiencies and enantioselectivities as Scheme 18.…”

Synthesis of BINOL derived phosphorodithioic acids as new chiral Brønsted acids and an improved synthesis of 3,3′-disubstituted H8-BINOL derivatives

“…To a solution of (R)-5,5 0 ,6,6 0 ,7,7 0 ,8,8 0 -octahydro-1,1 0 -binaphthyl-2,2 0 -diol 16 (2 g, 6.8 mmol) in CH 2 Cl 2 (60 mL) were added successively at room temperature, morpholine (3.6 mL, 41 mmol, 6 equiv) and I 2 (3.45 g, 13.6 mmol, 2 equiv). The mixture was stirred at this temperature for 5 h and turned progressively red.…”