New alkene-terminated phosphine dendron-protected palladium nanoparticles (NPs) have been synthesized, and the olefin metathesis polymerization of their Pd NPs led to shell crosslinked Pd NPs without aggregation of the Pd NPs. The introduction of crosslinking at the surface of the protective ligand enhanced the catalytic activity of the Pd NPs for Suzuki–Miyaura couplings.
Hydrogen Bond Donor and Unbalanced Ion Pair Promoter-Assisted Gold-Catalyzed Carbon–Oxygen Cross-Coupling of (Hetero)aryl Iodides with Alcohols
作者:Guifang Chen、Bo Xu
DOI:10.1021/acscatal.2c05890
日期:2023.2.3
We have developed an efficient gold-catalyzed C–O cross-couplingreaction of (hetero)aryliodides with primary and secondary alcohols via an AuI–AuIII catalytic cycle. This protocol featured moisture/air insensitivity, simple operation, and excellent functional group tolerance. Good yields were obtained regardless of steric hindrance and electronic factor (electron-rich or poor) of substrates, and
我们通过 Au I -Au III催化循环开发了一种有效的金催化的(杂)芳基碘化物与伯醇和仲醇的 C-O 交叉偶联反应。该协议具有水分/空气不敏感性、操作简单和出色的官能团耐受性。无论底物的空间位阻和电子因素(富电子或贫电子)如何,都获得了良好的产率,并且可以保留手性醇起始材料的手性。我们的协议适用于分子间和分子内偶联。此外,将 RuPhos 配体应用于金催化的交叉偶联。不平衡的离子对促进剂和氢键供体溶剂可能在这种转化中至关重要。
Polyamine Anchored Palladium Catalyst for Suzuki–Miyaura and One-Pot O-Alkylation-Suzuki Reactions
作者:Krupa N. Patel、Ashutosh V. Bedekar
DOI:10.1007/s10562-015-1570-z
日期:2015.9
Polymer anchored amine-palladium complexes were screened as catalysts for Suzuki-Miyaura coupling reactions of aryl halides. The robust, recyclable catalyst was effective in this reaction of aryl bromides and iodides. Aryl bromide was found to undergo selective Suzuki-Miyaura reaction with phenyl boronic acid, even in presence of styrene. The catalyst system was further employed for one-pot O-alkylation-Suzuki reaction to prepare alkoxy biaryl systems in good conversions.[GRAPHICS].
Ohta, K.; Takenaka, O.; Hasebe, H., Molecular Crystals and Liquid Crystals (1969-1991), 1991, vol. 195, p. 103 - 121
作者:Ohta, K.、Takenaka, O.、Hasebe, H.、Morizumi, Y.、Fujimoto, T.、Yamamoto, I.
DOI:——
日期:——
Optically active compounds, liquid crystal compositions comprising said compounds, and liquid crystal optical modulators using said compositions