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Synthesis and characterization of a Zn(II) complex of a pyrazole-based ligand bearing a chiral l-alaninemethylester by Soo-Gyun Roh; Yu-Chul Park; Dong-Kyu Park; Tae-Jeong Kim; Jong Hwa Jeong is a Chemistry article available to read on EtoBox.

What is Synthesis and characterization of a Zn(II) complex of a pyrazole-based ligand bearing a chiral l-alaninemethylester about?

Reaction of ZnCl 2 with a new ligand N, N-bis(3,5-dimethylpyrazolylmethyl)-L-alaninemethylester (bdmpame) in methanol gives [ZnCl 2 (bdmpame)]. The structure of [ZnCl 2 (bdmpame)]•CH 2 Cl 2 has been resolved by X-ray crystallographic analysis. The Zn atom has a distorted tetrahedral geometry involving a nitrogen atom from each pyrazole in bdmpame and two chloro ligands with bond lengths in the range 2.037(4)-2.237(2) A , . The nitrogen atom of the L-alaninemethylester group in the compound was not coordinated to the metal center, giving an eight-membered ring in which the nitrogen atoms of each pyrazole in bdmpame are coordinated to the metal center. The results of the catalytic enantioselective reduction of acetophenone promoted by ligand/ Zn(OTf) 2 =1:1 mole ratio in the presence of catecholborane for 48 h at 0°C gives (S)-(-)-1-phenylethanol in 21% ee with 68% yield.

Who reads Synthesis and characterization of a Zn(II) complex of a pyrazole-based ligand bearing a chiral l-alaninemethylester?

Author

Soo-Gyun Roh; Yu-Chul Park; Dong-Kyu Park; Tae-Jeong Kim; Jong Hwa Jeong

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0277-5387)

Published

2001

Language

EN

Field

Chemistry (Physical Sciences)