Application of the double Pauson-Khand cyclization to the synthesis of bis(cyclopentadienes): preparation of phenyl-bridged bis(tetrahydroindenyl)titanium and zirconium dichlorides
作者:Ronald L. Halterman、Timothy M. Ramsey、Nathan A. Pailes、Masood A. Khan
DOI:10.1016/0022-328x(95)00107-2
日期:1995.7
6-dinyl)benzen. We utilized for the firstime in a bis(cyclopentadiene) synthesis the double Pauson-Khand cyclization and Shapiro-elimination methods. The double Pauson-Khand cyclization is also successful in the preparation of ethylene-bridged bis(cyclopentadienes). A novel iodine-promoted elimination of allyl methyl ethers was also applied in the preparation of bis(cyclopentadienes). The solid state structure
我们已经证明了非常有效的方法(5个步骤,从1-辛烯7-炔和1,2-二碘代苯获得28%的产率)和1,2-双(9-双环[4.3.0] -non-1的新颖合成) ,6-dinyl)苯。我们将双Pauson-Khand环化和Shapiro消除方法用于双(环戊二烯)合成中的第一反应。双重Pauson-Khand环化也成功制备了乙烯桥联的双(环戊二烯)。一种新的碘促进的烯丙基甲基醚的消除也被用于双(环戊二烯)的制备中。获得了1,2-双(9-双环[4.3.0]-非-1,6-二烯基)苯二氯钛(dl - 4a)的固态结构,其在环戊二烯基取代基之间显示出非常钝角。dl的图像数据-图4a是如下:C 24 H ^ 24氯2的Ti,单斜晶系,,,,β = 121.40(3)°,体积1981.9埃3,Ž = 4,- [R = 4.41,[R瓦特= 6.92%,配合2.96优度。