Illuminating <i>anti</i>-hydrozirconation: controlled geometric isomerization of an organometallic species
作者:Theresa Hostmann、Tomáš Neveselý、Ryan Gilmour
DOI:10.1039/d1sc02454j
日期:——
reaction product functions as an efficient in situ generated photocatalyst. Coupling of the E-vinyl zirconium species with an alkyne unit generates a conjugated diene: this has been leveraged as a selective energy transfer catalyst to enable E → Z isomerization of an organometallic species. Through an Umpolung metal–halogen exchange process (Cl, Br, I), synthetically useful vinyl halides can be generated
据报道,实现芳基乙炔正式反加氢锆化的一般策略是将使用 Schwartz 试剂(Cp 2 ZrHCl)的顺式加氢金属化与随后在λ = 400 nm 处的光介导几何异构化相结合。所述的机理划定禁忌-thermodynamic异构化步骤指示次要反应产物用作高效的原位产生的光催化剂。所述的联接ë与炔烃单元-乙烯基锆物质生成的共轭二烯:这已被利用作为选择性能量转移催化剂以使È → ž有机金属物种的异构化。通过Umpolung金属 - 卤素交换过程(Cl、Br、I),可以生成合成有用的乙烯基卤化物(高达Z : E = 90 : 10)。这个支持平台提供了一种策略,可以从简单的芳基乙炔中获取两种几何形式的亲核和亲电烯烃片段。