Base-promoted dehydrogenative coupling of benzene derivatives with amides or ethers
作者:Ryota Ueno、Eiji Shirakawa
DOI:10.1039/c4ob01253d
日期:——
Electronically neutral and deficient benzene derivatives are introduced into the dehydrogenative coupling as arenes that couple with amides/ethers.
电子中性和缺陷的苯衍生物被引入到脱氢偶联中,作为与酰胺/醚偶联的芳烃。
Novel blended catalysts consisting of a TiO<sub>2</sub> photocatalyst and an Al<sub>2</sub>O<sub>3</sub> supported Pd–Au bimetallic catalyst for direct dehydrogenative cross-coupling between arenes and tetrahydrofuran
作者:Akanksha Tyagi、Akira Yamamoto、Hisao Yoshida
DOI:10.1039/c8ra02948b
日期:——
metal co-catalyst for the direct DCC between various arenes and tetrahydrofuran, with concomitant evolution of hydrogen gas. The reactions were done under mild conditions without consuming any oxidisingagent or other additional chemicals. This new approach of separating the photocatalyst and the metal catalyst parts allows their independent modification to improve the overall catalytic performance.
脱氢交叉偶联 (DCC) 是一种通过使用丰富的 C-H 键生成 C-C 键的清洁方法。本研究开发的混合催化剂由 TiO 2光催化剂和 Al 2 O 3负载的 Pd-Au 双金属催化剂组成,与负载相应金属助催化剂的常规 TiO 2光催化剂相比,在直接 DCC 之间表现出优异的活性。各种芳烃和四氢呋喃,同时放出氢气。反应在温和的条件下进行,不消耗任何氧化剂或其他额外的化学品。这种分离光催化剂和金属催化剂部分的新方法允许它们独立修改以提高整体催化性能。
Dual-Role Halogen-Bonding-Assisted EDA-SET/HAT Photoreaction System with Phenol Catalyst and Aryl Iodide: Visible-Light-Driven Carbon–Carbon Bond Formation
atom transfer (HAT) enables the direct generation of alkyl radicals. We report a dual-role EDA-SET/HAT photoreaction system for carbon–carbon bond formation using a phenol catalyst and aryl iodide. This system facilitates addition of alkyl radicals generated from ethers, amide, sulfide, and cycloalkane to arenes. Mechanistic studies revealed that EDA complex formation is mediated by halogen bonding
electron-deficient (trifluoromethylsulfonyl)benzenederivatives, as a phenyl precursor, was critical to realizing the present transformation. Moreover, the DFT calculations indicated that the present transformation proceeds via a concerted homolytic aromatic substitution rather than via a stepwise one involving the formation of a cyclohexadienyl radical intermediate.