847174-15-6Relevant articles and documents
A chiral [2]catenane self-assembled from meso-macrocycles of palladium(II)
Burchell, Tara J.,Eisler, Dana J.,Puddephatt, Richard J.
, p. 268 - 272 (2007/10/03)
Reaction of trans-[PdX2(SMe2)2] (X = Cl or Br) with the chiral ligand LL = 1,1-binaphthyl-2,2′-(NHC( = O)-3-C 5H4N)2 gave the [2]catenane complexes trans-[{(PdX2)2(μ-LL)2}2], which are formed by self-assembly from 4 units each of trans-PdX2 and LL. The catenation is favored by the formation of multiple hydrogen bonds between the constituent macrocycles (4 × NH...ClPd, 2 × NH...O=C). If the ligand LL is racemic, each macrocycle trans-[(PdX2) 2(μ-LL),] is formed in the meso form trans-[(PdX2) 2(μ-R LL)(μ-S-LL)] but the resulting [2]catenane is chiral as a direct result of the catenation step. This is the first time that this form of chiral [2]catenane has been observed. The enantiomers of the [2]catenane further self-assemble in the crystalline form, through secondary intermolecular Pd...X bonding, to form a racemic infinite supramolecular polymer of [2]catenanes.
Asymmetric Reduction with C1- and C2-Symmetric NADH Model Cpmpounds Containing Chiral 1,1'-Binaphthyls
Amano, Masaki,Watanabe, Motoshi,Baba, Naomichi,Oda, Jun'ichi,Inouye, Yuzo
, p. 3672 - 3678 (2007/10/02)
The present study deals with Mg-catalyzed asymmetric reduction of ethyl benzoylformate by the use of C2-symmetric NADH model compounds in which axial dissymmetry(chiral 1,1'-binaphthyl derivatives) was introduced as a chiral source for the first time and the results were compared with those obtained by the corresponding C1-symmetric models bearing the same chiral center.Better e.e.'s of the reduction product were obtained by the use of NADH models having C2-symmetry than does the corresponding C1-symmetric ones.Further, the kind of bonding as well as the distance between chiral binaphthyl and the reaction center affected the stereochemical course of hydrogen transfer.