Highly Active and Selective Ru‐PN
<i>H</i>
Catalyst in Aerobic Oxidation of Benzyl Amines
作者:Michal Aman、Jakub Tremmel、Libor Dostál、Milan Erben、Jiří Tydlitát、Josef Jansa、Roman Jambor
DOI:10.1002/cctc.201900952
日期:2019.9.19
Set of [Ru(η6‐cymene)(R)XCl] (R=L1SnCl, L1GeCl L2PPh2, X=Cl or SnCl3, L1=[2‐(CH2NEt2)‐4,6‐(tBu)2C6H2]−, L2=2,6‐iPr2‐C6H3‐NH−) catalysts was tested in aerobic oxidations of primary amines. The activity of studied catalysts depends on the charge of the Ru atom that has been influenced either by donating ligands R or by character of X. Typical Ru/P catalyst [Ru(η6‐cymene)(L2PPh2)Cl2] (3) with least negative
组的[Ru(η 6 -cymene)(R)XCL](R = L 1的SnCl,L 1 GeCl大号2 PPH 2,X = Cl或的SnCl 3,L 1 = [2-(CH 2网2) - 4,6‐(t Bu)2 C 6 H 2 ] −,L 2 = 2,6 ‐ i Pr 2‐ C 6 H 3‐ NH −)催化剂在伯胺的好氧氧化中进行了测试。研究催化剂的活性取决于充电的钌原子的已经由供体配体R或通过X.典型的Ru / P催化剂的字符的[Ru(η或者影响6 -cymene)(L 2 PPH 2)氯2 ] (3)已观察到Ru原子上带负电荷最少的是最有效的。包含氨基膦PN H部分的膦配体L 2的设计通过将PN H官能团与SiO 2进行氢键结合,将配合物3有效地锚定在硅胶上以得到非均相催化剂3 -二氧化硅。该复合物已在好氧氧化中作为可循环使用的催化剂进行了有效测试,累积TON高达6930。