Alkene Isomerisation Catalysed by a Ruthenium PNN Pincer Complex
作者:Sébastien Perdriau、Mu-Chieh Chang、Edwin Otten、Hero J. Heeres、Johannes G. de Vries
DOI:10.1002/chem.201403236
日期:2014.11.17
rearomatised alkoxide complex. In this complex, the hemilabile diethylamino side‐arm can dissociate, allowing alkene binding cis to the hydride, enabling insertion of the alkene into the metal–hydride bond, whereas in the parent complex only trans binding is possible. During this study, a new uncommon Ru0 coordination complex was also characterised. The scope of the alkene isomerisation reaction was examined
Facile Pd(II)- and Ni(II)-Catalyzed Isomerization of Terminal Alkenes into 2-Alkenes
作者:Hwan Jung Lim、Craig R. Smith、T. V. RajanBabu
DOI:10.1021/jo900180p
日期:2009.6.19
of [(allyl)PdCl]2 or [(allyl)NiBr]2, a triarylphosphine, and silver triflate at room temperature. The isomeric ratio (E:Z) depends on the alkenes, the E-isomer being the major one. The reaction is tolerant to a wide variety of functional groups including other reactive olefins. Unlike the more reactive Ir catalysts, monosubstituted alkenes give almost exclusively the 2-alkenes. Direct comparison to two
通过用催化量的 [(烯丙基)PdCl] 2或 [(烯丙基)NiBr] 处理单取代和 2,2'-二取代末端烯烃,可以将其异构化为更稳定的内 ( Z )- 和 ( E )-烯烃2 、室温下的三芳基膦和三氟甲磺酸银。异构体比例 ( E : Z ) 取决于烯烃,其中E异构体是主要异构体。该反应可耐受多种官能团,包括其他反应性烯烃。与活性更高的 Ir 催化剂不同,单取代烯烃几乎只生成 2-烯烃。还描述了与该过程中两种最著名的催化剂[Ir(PCy 3 ) 3 ] + [BPh 4 ] -和格拉布第二代复分解催化剂}的直接比较。
Chemistry of Dienyl Anions. I. Crystalline Dienyl Anions by Direct Reaction of Conjugated and Non-conjugated Dienes with Alkali Metals in the Presence of Et<sub>3</sub>N
Series of acyclic and cyclic dienyl anions were prepared from both conjugated and non-conjugated dienes by direct metalation with alkalimetals (Li, Na, K, Rb, and Cs) in tetrahydrofuran in the pre...
The dissolution of a stainless steel anode provides catalytic nickel species which enable the efficient synthesis of ketones by electrolysis of organic halides in DMF in the presence of bipyridine and carbon monoxide.
Electrosynthesis of symmetrical ketones from organic halides and carbon dioxide catalysed by 2,2′-bipyridine-nickel complexes
作者:L. Garnier、Y. Rollin、J. Périchon
DOI:10.1016/0022-328x(89)87056-1
日期:1989.5
reduction of a 2,2′-bipyridine-nickel complex, in the presence of carbon dioxide in N-methylpyrrolidone or dimethylformamide as solvent gives the corresponding nickel(0) complex associated with two molecules of CO. Oxidative addition of an alkyl halide to this complex, followed by an internal CO shift and reductive elimination, leads to the formation of a symmetrical ketone in high yield along with nickel(II)