Visible Light Mediated C(sp3)‐H Alkenylation of Cyclic Ethers Enabled by Aryl Ketone.

C−H alkenylation of cyclic ethers (THF, 1,4‐dioxane) using the readily available nitroalkenes as the alkenylating reagents has been developed. It allows the rapid access to the α‐alkenyl ethers with high E‐selectivity. The previous inaccessible α‐dienyl ethers are successfully obtained. Acyclic ether can also participate in this alkenylation process. The mechanism study reveals that alkenylation proceeded through a proton coupled electron transfer (PCET) process with a de‐nitration. Photo mediator: An organic photocatalyst combined with suitable base allow the employment of readily available versatile nitroalkenes for alkenylation of ethers. Good Z/E selectivity was obtained via an efficient proton coupled electron transfer process. [ABSTRACT FROM AUTHOR]