We have developed thioxanthylium photoredox catalyzed [4 + 2] cycloaddition of pentafulvenes at room temperature under green light irradiation, which affords tetrahydrocyclopenta[b]chromenes with high regioselectivities. The present reaction provides a sustainable approach to carry out the cycloaddition of pentafulvenes without the use of transition metal catalysts or high-temperature conditions. This
我们开发了在室温下绿光照射下硫代黄鎓光氧化还原催化的五富烯的 [4 + 2] 环加成反应,得到具有高区域选择性的四氢环戊二烯[ b ]色烯。本反应提供了一种可持续的方法来进行五富烯的环加成,而无需使用过渡金属催化剂或高温条件。该程序可以温和而直接地获得 1,3a,9,9a-四氢环戊二烯[ b ]色烯。反应的量子产率(Φ =0.15)表明反应主要通过光催化途径进行。
Crosslinked metallocene compound for olefin polymerization and method of polymerizing olefin with the same
申请人:Tohi Yasushi
公开号:US20060161013A1
公开(公告)日:2006-07-20
The bridged metallocene compound or the olefin polymerization catalyst which comprises the compound, enables high polymerization activity in polymerizing one or more monomers selected from ethylene and α-olefins. The bridged metallocene compound contains specific substituted cyclopentadienyl and fluorenyl groups which are linked via carbon or silicon atoms. In the method for the preparation of polyolefins, one or more monomers, preferably ethylene as an essential monomer, selected from ethylene and α-olefins are copolymerized in the presence of the olefin polymerization catalyst comprising the bridged metallocene compound, so that an ethylene based polymer with an ethylene content of more than 50 mol % is obtained.
作者:Soumyadip Hore、Abhijeet Singh、Shreemoyee De、Neetu Singh、Vincent Gandon、Ravi P. Singh
DOI:10.1021/acscatal.2c00175
日期:——
optoelectronics, photocatalysis, bioimaging, and pharmaceutically relevant materials. However, their synthesis is often challenging and plagued with various bottleneck steps. Here, we demonstrate a relayed addition of fulvene moieties onto quinones. The developed ligand-assisted Pd-catalyzed dehydrogenative [2 + 2 + 2] cycloaddition reaction enables facile access to a new class of polyarylquinones. The key to