Site-selectivity in TBADT-photocatalyzed C(sp<sup>3</sup>)–H Functionalization of Saturated Alcohols and Alkanes
作者:Takahide Fukuyama、Keiichi Yamada、Tomohiro Nishikawa、Davide Ravelli、Maurizio Fagnoni、Illhyong Ryu
DOI:10.1246/cl.171068
日期:2018.2.5
Site-selectivity in C(sp3)–H functionalization of aliphatic alcohols and alkanes was studied using the decatungstate anion as a photocatalyst. In the case of aliphatic alcohols, C–H bond α to the hydroxy group was preferentially functionalized. The α-site-selectivity is rationalized by polar effects imparted by the hydroxy group in the SH2 transition states. In contrast, C–H functionalization of alkanes was largely affected by steric effects.
采用十钨酸盐阴离子作为光催化剂,研究了脂肪醇和烷烃的C(sp3)–H功能化中的位点选择性。对于脂肪醇,优先功能化的是羟基相邻的C–H键。α位点选择性可以通过SH2过渡态中羟基的极性效应来合理解释。相比之下,烷烃的C–H功能化主要受到空间效应的影响。