Remarkably simple IrIII catalysts enable the isomerization of primary and sec‐allylicalcohols under very mild reaction conditions. X‐ray absorption spectroscopy (XAS) and mass spectrometry (MS) studies indicate that the catalysts, with the general formula [Cp*IrIII], require a halide ligand for catalytic activity, but no additives or additional ligands are needed.
非常简单的Ir III催化剂可在非常温和的反应条件下实现伯醇和仲烯丙基醇的异构化。X射线吸收光谱(XAS)和质谱(MS)研究表明,通式为[Cp * Ir III ]的催化剂需要卤化物配体才能发挥催化活性,但不需要添加剂或其他配体。
Ir-catalysed formation of C−F bonds. From allylic alcohols to α-fluoroketones
作者:Nanna Ahlsten、Belén Martín-Matute
DOI:10.1039/c1cc12653a
日期:——
A novel iridium-catalysed tandem isomerisation/CâF bond formation from allylic alcohols and Selectfluor® to prepare α-fluorinated ketones as single constitutional isomers is reported.
isomerized into enolates (enols) by [Cp*IrCl2]2. The enolates react with Selectfluor present in the reaction media. This method produces α-fluoroketones as single constitutional isomers in high yields. iridium - fluorine - isomerization - alcohols - fluoro ketones
Hindered organoboron groups in organic chemistry. 24. The condensation of aliphatic aldehydes with dimesitylboron stabilised carbanions to give ketones.
作者:Andrew Pelter、Keith Smith、Said M.A. Elgendy、Martin Rowlands
DOI:10.1016/s0040-4020(01)87982-5
日期:1993.8
The condensation of boron stabilised carbanions, Mes2BCHLiR1, (R1≠H) with aliphatic aldehydes, R2CHO, followed by treatment with trifluoroacetic anhydride (TFAA) or N-chlorosuccinimide (NCS) is an unique, broadly applicable redox process that yields ketones, R1CH2COR2, directly and in high yields. The anion Mes2BCH2Li (Mes2BCHLiR1, R1H) gives high yields of alkenes, R2CHCH2 in the same conditions
A regiospecific synthesis of trimethylsilyl enol ethers using rhodium catalyzed isomerization of β-trimethylsilylallyl alcohols
作者:Isamu Matsuda、Susumu Sato、Yusuke Izumi
DOI:10.1016/s0040-4039(00)88023-5
日期:1983.1
The rhodium catalyzed isomerization of β-trimethylsilylallyl alcohols has been successfully applied for the regiospecific synthesis of trimethylsilyl enol ethers.