可见光诱导苄基硅烷合成苄醚（英文）

Visible light-mediated conversion of benzylsilanes to benzyl ethers

研究了可见光诱导苄基硅烷合成苄醚的方法,苄基硅烷与醇的醚化反应以Ru(bpy)_3[PF_6]_2作为光催化剂,Na_2S_2O_8作为氧化剂,CuCl作为添加剂,反应体系在蓝光LED照射下反应2~24小时,相应产品获得良好的收率。机理研究表明反应涉及两个催化体系,分别是Ru(bpy)_3^(2+)-S_2O_8^(2-)和Cu^+-SO_4^(·-)。苄基硅烷经Ru(bpy)_3^(3+)和Cu^(2+)连续氧化得到苄基正离子,醇对其进行亲核进攻得到苄醚。

A novel approach for preparation of benzyl ethers from benzylsilanes, based on a visible light mediated reaction, has been developed. Etherification reactions of benzylsilanes with alcohols were car- ried out in presence of Ru（bpy）3[PF6]2 as a photocatalyst, using Na2S2O2 as an oxidant, and CuC1 as an additive, under blue light irradiation for 2 - 24 h. The corresponding products were obtained with good yields. The possible mechanism was suggested due to two catalytic cycles for Ru （bpy）2/3 ＋ -52O2/8 - and Cu ＋ -SQ4-. The benzylsilanes were successively oxidized to benzyl cations by Ru （bpy）33 ＋ and Cu2＋ , which were then attacked by nucleophilic alcohols to afford ethers.