Preparation of Cyclophanes by Room-Temperature Ring-Closing Alkyne Metathesis with Imidazolin-2-iminato Tungsten Alkylidyne Complexes
作者:Stephan Beer、Kai Brandhorst、Jörg Grunenberg、Cristian G. Hrib、Peter G. Jones、Matthias Tamm
DOI:10.1021/ol800154y
日期:2008.3.1
Room-temperature ring-closing alkyne metathesis of 1,2-, 1,3-, and 1,4-bis(3-pentynyloxymethyl)benzenes has been investigated in the presence of catalytic amounts of an imidazolin-2-iminato tungsten alkylidyne complex. The m- and p-diynes selectively form the respective [10]metacyclophane or [10.10]paracyclophane, respectively, whereas a mixture of monomeric and dimeric cycloalkynes is obtained in
在催化量的咪唑啉-2-亚氨基钨亚烷基钨配合物存在下,研究了1,2-,1,3-和1,4-双(3-戊炔氧基甲基)苯的室温闭环炔烃复分解反应。 。间二和对二炔选择性地分别形成各自的[10]元环烷或[10.10]对环烷,而在邻二炔的情况下,则获得了单体和二聚环炔的混合物。DFT计算表明,不同的选择性可以归因于新兴环烷的相对热力学稳定性。