Heavy-Metal-Free Fischer–Tropsch Type Reaction: Sequential Homologation of Alkylborane Using a Combination of CO and Hydrides as Methylene Source
作者:Andreas Phanopoulos、Shrinwantu Pal、Takafumi Kawakami、Kyoko Nozaki
DOI:10.1021/jacs.0c06580
日期:2020.8.19
LiHBEt3 or LiAlH4 resulted in multiple CO insertion/reduction events to afford elongated chains by more than two methylene (-CH2-) units, affording aldehyde products upon oxidative aqueous workup. Theoretical and experimental mechanistic studies indicate that the boron terminus is responsible for CO incorporation as well as sequential hydride delivery leading to reduction of acylborane intermediates to alkylboranes
碳同系化反应发生在众所周知的 Fischer-Tropsch 过程中,通常在高温下由过渡金属催化剂介导。在这里,我们报告了使用 CO 作为 C1 源的碳链的低温、无重金属同系化,首次表明 Fischer-Tropsch 型反应性不需要过渡金属催化剂。烷基硼烷在 LiHBEt3 或 LiAlH4 存在下的反应导致多次 CO 插入/还原事件,以提供由两个以上亚甲基 (-CH2-) 单元组成的延长链,在氧化水性处理后提供醛产物。理论和实验机理研究表明,硼末端负责 CO 掺入以及顺序氢化物递送,导致酰基硼烷中间体还原为烷基硼烷。