Visible Light-Induced Direct S0 → Tn Transition of Benzophenone Promotes C(sp3)–H Alkynylation of Ethers and Amides
摘要:
Benzophenone has an S-0 -> S-1 absorption band at 365 nm. However, the rarely reported S-0 -> T-n transition occurs upon irradiation at longer wavelengths. Herein, we employed benzophenone as a catalyst and exploited its S-0 -> T-n transition in C(sp(3))-H alkynylations with hypervalent iodine reagents. The selective benzophenone excitation prevented alkynylating reagent decomposition, enabling the reaction to proceed under mild conditions. The reaction mechanism was investigated by spectroscopic and computational studies.
Direct acylation and alkynylation of hydrocarbons <i>via</i> synergistic decatungstate photo-HAT/nickel catalysis
作者:Wenfeng Liu、Yang Ke、Chuhan Liu、Wangqing Kong
DOI:10.1039/d2cc04408k
日期:——
Herein, we describe a protocol for the direct and selective acylation and alkynylation of the C(sp3)–H bonds of saturated hydrocarbons by synergistic decatungstate photo-HAT and nickel catalysis. This method, using cheap and easy-to-synthesize TBADT as a HAT photocatalyst, exhibits excellent siteselectivity. A wide variety of high-value ketones, amides, esters, and diverse alkynes can be efficiently
在这里,我们描述了一种通过协同十钨酸盐光-HAT 和镍催化对饱和烃的 C(sp 3 )-H 键进行直接和选择性酰化和炔基化的方案。该方法使用廉价且易于合成的 TBADT 作为 HAT 光催化剂,具有优异的位点选择性。从丰富的碳氢化合物原料中可以有效地构建各种高价值的酮、酰胺、酯和各种炔烃。