1,4-二(2-乙基己基)2,5-二乙烯基苯,1,4-二(2-乙基己氧基)-2,5-二乙烯基苯和9,9-二(2-乙基己基)-2,7-二乙烯基芴分别由二醛合成,并使用Grubbs II或Grubbs-Hoveyda-Grela型烯烃复分解催化剂聚合ADMET。在高沸点溶剂(1,2-二氯苯)中在升高的温度下于20 mbar的动态真空下连续除去乙烯,导致长链聚[2,5-二(2-乙基己基)-对亚苯基亚乙烯基]的形成](M n > 100 kDa,P n = 330,M w / M n = 3.1)和聚[9,9-二(2-乙基己基)芴基-2,7-乙烯基](M n > 70 kDa,Pn = 178)。PPV在蒸发甲苯溶液后形成一个独立的膜。1,3-(二异丙烯基)二茂铁不能以这种方式聚合。用1,1'-二(4-乙烯基苯基)-3,3',4,4'-四甲基二茂铁得到含二茂铁的聚合物。
Gold‐Catalyzed [3+2]‐Annulations of α‐Aryl Diazoketones with the Tetrasubstituted Alkenes of Cyclopentadienes: High Stereoselectivity and Enantioselectivity
作者:Ching‐Nung Chen、Wei‐Min Cheng、Jian‐Kai Wang、Tzu‐Hsuan Chao、Mu‐Jeng Cheng、Rai‐Shung Liu
DOI:10.1002/anie.202012611
日期:2021.2.23
This work reports gold‐catalyzed [3+2]‐annulations of α‐diazo ketones with highly substituted cyclopentadienes, affording bicyclic 2,3‐dihydrofurans with high regio‐ and stereoselectivity. The reactions highlights the first success of tetrasubstituted alkenes to undergo [3+2]‐annulations with α‐diazo carbonyls. The enantioselective annulations are also achieved with high enantioselectivity using chiral
Gold(I)-Catalyzed Highly Enantioselective [4 + 2]-Annulations of Cyclopentadienes with Nitrosoarenes via Nitroso-Povarov versus Oxidative Nitroso-Povarov Reactions
作者:Prakash D. Jadhav、Jia-Xuan Chen、Rai-Shung Liu
DOI:10.1021/acscatal.0c01293
日期:2020.5.15
gold-catalyzed highlyenantioselective nitroso-Povarov reactions between cyclopentadienes and nitrosoarenes in cold dichloroethane, in which nitrosoarenes serve as 4π-electron donors and cyclopentadienes as 2π-donors. High enantioselectivity has been achieved for substrates over a wide scope. With the same chiral catalyst, nitroso-4-fluorobenzenes in these reactions under DCM/THF/water/air led to oxidative nitroso-Povarov
Gold(I)-Catalyzed Highly Diastereo- and Enantioselective Constructions of Bicyclo[3.2.1]oct-6-ene Frameworks via (4 + 3)-Cycloadditions
作者:Sudhakar Dattatray Tanpure、Tung-Chun Kuo、Mu-Jeng Cheng、Rai-Shung Liu
DOI:10.1021/acscatal.1c04483
日期:2022.1.7
1]oct-6-ene frameworks involves gold-catalyzed (4 + 3)-cycloadditions between 2-(1-alkynyl)-2-alken-1-ones and substituted cyclopentadienes; diastereoselectivity (dr >25:1) and enantioselectivity (up to 99.9% ee) are achieved with a chiral gold catalyst. Our DFT calculations suggest a three-step ionic mechanism for the cycloadditions of gold-containing 1,3-dipoles with cyclopentadienes, in which an exo-spatial