Mixed Phosphane η<sup>5</sup>-CpRuCl(PR<sub>3</sub>)<sub>2</sub>Complexes as Ambifunctional Catalysts for Anti-Markovnikov Hydration of Terminal Alkynes
at C-6) for anti-Markovnikovhydration of terminal alkynes to aldehydes is retained when one heterocyclic ligand L is replaced by L' = PPh(3). Equal amounts of CpRuCl(PPh(3))(2) (1) and phosphane L in acetone solution equilibrate to a mixture of 1, CpRuCl(L)(PPh(3)) (2), and CpRuCl(L)(2) (3), which acts as highly active in situ catalyst for preparative anti-Markovnikovhydration of alkynes in water-rich
[CpRu(L)(2)(MeCN)]PF(6)(L = 2-diphenylphosphinopyridine 在 C-6 处具有庞大的基团)在一个杂环配体时保留了对末端炔烃的反马尔科夫尼科夫水合反应的催化活性L 由 L' = PPh(3) 代替。丙酮溶液中等量的 CpRuCl(PPh(3))(2) (1) 和磷烷 L 平衡为 1、CpRuCl(L)(PPh(3)) (2) 和 CpRuCl(L)(2) 的混合物) (3),在富水介质(2 mol % [Ru],60 °C,3-18 h in 4:1 (v/v ) 丙酮/水)。反应在 160 °C 下 <15 分钟内完成。
<i>tert</i>-Butyl Nitrite: Organic Redox Cocatalyst for Aerobic Aldehyde-Selective Wacker–Tsuji Oxidation
作者:Xiao-Shan Ning、Mei-Mei Wang、Chuan-Zhi Yao、Xian-Min Chen、Yan-Biao Kang
DOI:10.1021/acs.orglett.6b01165
日期:2016.6.3
An aldehyde-selective aerobic Wacker–Tsuji oxidation is developed. Using tert-butylnitrite as a simple organic redox cocatalyst instead of copper or silver salts, a variety of aldehydes were achieved as major products in up to 30/1 regioselectivity as well as good to high yields at room temperature.
Tuning Regioselectivity of Wacker Oxidation in One Catalytic System: Small Change Makes Big Step
作者:Kang-Fei Hu、Xiao-Shan Ning、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.joc.8b01547
日期:2018.9.21
A regioselectivity switchable aerobic Wacker–Tsuji oxidation has been developed using catalytic tert-butyl nitrite as a simple organic redox cocatalyst. By solely switching the solvent, either substituted aldehydes or ketones could be prepared under mild aerobic conditions in good yields, respectively. A mechanistic explanation for the selectivity control is proposed.