• Title/Summary/Keyword: Diethylzinc

Search Result 48, Processing Time 0.021 seconds

Chiral β-Amino Thiol Catalysts for the Enantioselective Addition of Diethylzinc to Aldehydes

  • 강자효;김정환;이준원;김동수;김주인
    • Bulletin of the Korean Chemical Society
    • /
    • v.17 no.12
    • /
    • pp.1135-1142
    • /
    • 1996
  • Reaction of diethylzinc with α-branched aldehydes in the presence of a catalytic amount (5 mol %) of various β-amino thiols in toluene or ether provided the corresponding secondary alcohols in outstanding ee. Detailed preparative procedure for the β-amino thiols are presented.

Microstructure of ZnO Thin Films Deposited by PECVD using Diethylzine (Diethylzinc를 사용하여 PECVD로 증착한 ZnO 박막의 미세 구조 분석)

  • 김영진;김형준
    • Korean Journal of Crystallography
    • /
    • v.4 no.2
    • /
    • pp.92-99
    • /
    • 1993
  • ZnO thin films were depositsd by Plasma enhanced CVD (PUW) using Diethylzinc and N2O gas, and micro-structue of ZnO thin films were investigated ZnO thin films composed of micro-crystallites was deposited at the substrate of loot. However, highly c-axis oriented ZnO thin films were deposited on the glass substrates above 200℃. TEM analysis revealed that an epitaxial (002) ZnO thin film was deposited on c-plane sapphire substrate at the substrate temperature of 350℃, and More patterns showing partial dislocation were observed at the grain boundary.

  • PDF

Highly Enantioselective Addition of Diethylzinc to Aldehydes Catalyzed by Novel Chiral tert-Amino Alcohols

  • Zhang, Cong-Hai;Yan, Sheng-Jiao;Pan, Sheng-Qiang;Huang, Rong;Lin, Jun
    • Bulletin of the Korean Chemical Society
    • /
    • v.31 no.4
    • /
    • pp.869-873
    • /
    • 2010
  • A series of novel chiral tert-amino alcohols 4a-h derived from enantiomerically pure phenylalanine were synthesized efficiently and used as chiral ligands in the catalytic enantioselective ethylation of aldehydes with diethylzinc (diethylzinc-to-aldehyde addition). The use of 10 mol % of the amino alcohols led to the corresponding sec-alcohols with excellent enantioselectivities (up to 100% ee) and high yields.

Investigation on Reaction Pathways for ZnO Formation from Diethylzinc and Water during Chemical Vapor Deposition

  • Kim, Young-Seok;Won, Yong-Sun
    • Bulletin of the Korean Chemical Society
    • /
    • v.30 no.7
    • /
    • pp.1573-1578
    • /
    • 2009
  • A computational study of the reactions between Zn-containing species, the products of the thermal decomposition of diethylzinc (DEZn) and water was investigated. The Zn-containing species – $C_2H_5)_2,\;HZnC_2H_5,\;and\;(ZnC_2H_5)_2$ – were assumed to react with water during ZnO metal organic chemical vapor deposition (MOCVD). Density functional theory (DFT) calculations at the level of B3LYP/6-311G(d) were employed for the geometry optimization and thermodynamic property evaluation. As a result dihydroxozinc, $Zn(OH)_2$, was the most probable reaction product common for all three Zn-containing species. A further clustering of $Zn(OH)_2$ was investigated to understand the initial stage of ZnO film deposition. In experiments, the reactions of DEZn and water were examined by in-situ Raman scattering in a specially designed MOCVD reactor. Although direct evidence of $Zn(OH)_2$ was not observed, some relevant reaction intermediates were successfully detected to support the validity of the gas phase reaction pathways proposed in the computational study.