Oxidative Route to Abnormal NHC Compounds from Singly Bonded [M–M] (M = Ru, Rh, Pd) Precursors
摘要:
A new base-free entry to metal-aNHC compounds from metal metal bonded bimetallic precursors and imidazolium salts is reported. Regioselective metalation proceeds via C-I oxidative addition of an annulated imidazo[1,2-a] [1,8]naphthyridine system to [Ru-I-Ru-I], [Ru-II-Ru-II], and [Pd-I-Pd-I] single bonds, affording C-5-bound (abnormal) Ru-II-, Rh-III-, and Pd-II-NHC compounds, respectively, at room temperature and in high yields.
A Highly Efficient Catalyst for Selective Oxidative Scission of Olefins to Aldehydes: Abnormal-NHC–Ru(II) Complex in Oxidation Chemistry
作者:Prosenjit Daw、Ramu Petakamsetty、Abir Sarbajna、Siladitya Laha、Ramesh Ramapanicker、Jitendra K. Bera
DOI:10.1021/ja5075294
日期:2014.10.8
The utility and selectivity of the catalyst [Ru(COD)(L(1))Br2] (1) bearing a fused π-conjugated imidazo[1,2-a][1,8]naphthyridine-based abnormal N-heterocyclic carbene ligand L(1) is demonstrated toward selective oxidation of C═C bonds to aldehydes and C≡C bonds to α-diketones in an EtOAc/CH3CN/H2O solvent mixture at room temperature using a wide range of substrates, including highly functionalized