三个含有噻吩或四氢呋喃杂环基团的 β-二酮亚氨基前配体 H 2 L 1、H 2 L 2和 H L 3 (MeC(NDipp)CHC( Me )N(CH 2 ) n -2-(HCG), HCG = C 4 H 2 S, n = 2, L 1 ; n = 1, L 2 ; HCG = C 4 H 7 O, n = 1, L 3 ; Dipp = 2,6- i Pr 2 C 6 H 3), 已经开发了。不寻常的N , N , C三齿 β-二酮亚氨基稀土金属单烷基配合物L 1 RE(CH 2 SiMe 3 )(thf) (RE = Y ( 1a ), Er ( 1b ), Yb ( 1c ), Lu ( 1d ) , thf = 四氢呋喃) 和L 2 Yb(CH 2 SiMe 3 )(thf) ( 2c ) 通过 RE(CH 2 SiMe 3 ) 3 (thf) 2与 H 2 L 1和 H的反应出乎意料地实现2
Nickel-catalyzed Tishchenko reaction via hetero-nickelacycles by oxidative cyclization of aldehydes with nickel(0) complex
作者:Sensuke Ogoshi、Yoichi Hoshimoto、Masato Ohashi
DOI:10.1039/b926866a
日期:——
A Ni(0)-catalyzed Tishchenko reaction which can be applied to a variety of aliphatic aldehydes (1°, 2°, 3°) and aromatic aldehydes was developed. The reaction might proceed via a hetero-nickelacycle intermediate.
Oxidant controlled Pd-catalysed selective oxidation of primary alcohols
作者:Chao Liu、Shan Tang、Aiwen Lei
DOI:10.1039/c2cc38086b
日期:——
catalysed selectiveoxidation of primary alcohols to aldehydes or esters was investigated. The electronic properties of the benzylic alcohols and the structure of the oxidant are both important factors in controlling the selectivity between aldehydes and esters. A covalentbenzylligand derived from BnCl provides eta(3) coordination to the Pd centre. This covalentligand is the key to the selective oxidative
We have synthesized a new nickel enolate [(PhCOCF2)Ni(dcpe)][FB(C6F5)(3)] featuring fluorine atoms on the enolate moiety via B(C6F5)(3)-promoted C-F bond activation of alpha,alpha,alpha-trifluoroacetophenone. X-ray diffraction study of [(PhCOCF2)Ni(dcpe)][FB(C6F5)(3)] revealed that the complex had adopted an eta(3)-oxallyl coordination mode in the crystal lattice. The reaction of (BuNC)-Bu-t with [(PhCOCF2)Ni(dcpe)][FB(C6F5)(3)] resulted in the coordination of isocyanide to the nickel center to form a C-bound enolate complex. The reactions of [(PhCOCF2)Ni(dcpe)][FB(C6F5)(3)] with aldehydes gave insertion products quantitatively which were fully characterized by NMR spectroscopy. Furthermore, we established unique catalytic applications for [(PhCOCF2)Ni(dcpe)][FB(C6F5)(3)] toward a Tishchenko reaction, along with a highly selective crossed-esterification of alpha,alpha,alpha-trifluoroacetophenones with aldehydes.
Productive Chloroarene C−Cl Bond Activation: Palladium/Phosphine-Catalyzed Methods for Oxidation of Alcohols and Hydrodechlorination of Chloroarenes
作者:Xiaohong Bei、Alfred Hagemeyer、Anthony Volpe、Robert Saxton、Howard Turner、Anil S. Guram
DOI:10.1021/jo048715y
日期:2004.12.1
The palladium/phosphine-catalyzed productive chloroarene C-Cl bond activation provides general, efficient, and functional group friendly methods for the selective oxidation of alcohols and the hydrodechlorination of chloroarenes.