cyclopentane/[PdCl(C3H5)]2 system catalyses efficiently the cross-coupling of aryl bromides with functionalised arylboronicacids. The electronic properties of the arylboronicacids seem to have a minor influence on the reaction rate. Better results were generally obtained for the reaction of electron poor aryl bromides associated with electron rich arylboronicacids rather than the contrary.
The preparation of a solid Pd(II)-precatalyst and its use in microwave-assisted Suzuki-Miyaura reactions in water is described. The precatalyst is obtained by treatment of 4-pyridine-aldoxime with Na2PdCl4 and is insoluble in organic solvents as well as in water. Its robustness under microwave conditions and its insolubility allows simple reuse in ‘teabags’.
Synthesis of water soluble Pd‐Piperidoimidazolin‐2‐ylidene complexes and their catalytic activities in neat water
作者:Sinem Çakır、Hayati Türkmen
DOI:10.1002/aoc.5499
日期:2020.4
Through the strategy of water soluble N‐heterocyclic carbene (NHC) ligand, Pd‐catalyzed reactions were developed in aqueous media. Therefore, four new piperidoimidazolinium salts (1a‐d) consisting of sulfonate (a), esther (b, c) and carboxylic acid (d) functionalities and their water‐soluble Pd‐NHC complexes (2a‐d) were synthesized. The new compounds were characterized by elemental analysis, FTIR,
L'invention concerne un procédé pour la préparation de dérivés biphénylyl par condensation entre des dérivés phényl substitués par un groupe partant et des acides benzèneboroniques, en présence d'un catalyseur, d'une base forte et d'un agent de transfert de phase.