Unexpected Mild Protection of Alcohols as 2-<i>O</i>-THF and 2-<i>O</i>-THP Ethers Catalysed by Cp<sub>2</sub>TiCl Reveal an Intriguing Role of the Solvent in the Single-Electron Transfer Reaction
作者:María Jesús Durán-Peña、José Manuel Botubol-Ares、James R. Hanson、Rosario Hernández-Galán、Isidro G. Collado
DOI:10.1002/ejoc.201500869
日期:2015.10
) dichloride:acetonitrile adduct together with manganese(0) as a reductant and bromoform in THF or THP as the solvent. A radical mechanism is proposed for this transformation revealing an intriguing role of the solvent in the single-electron transfer reactions catalysed by the low valent TiIII system.
已经开发了一种在室温下将伯醇、仲醇和叔醇转化为相应的 THF 醚以及将伯醇和仲醇转化为相应的 THP 醚的方法,该方法使用由催化量的二氯化钛或( 4R,5R)-(–)-2,2-二甲基-α,α,α',α'-tetra(1-naphthyl)-1,3-dioxolane-4,5-dimethanolatotitanium(IV) 二氯化物:乙腈加合物与作为还原剂的锰(0)和作为溶剂的 THF 或 THP 中的溴仿一起使用。针对这种转变提出了一种自由基机制,揭示了溶剂在低价 TiIII 体系催化的单电子转移反应中的有趣作用。