Modes of Reactivity of Cyclic Diynes: Probing the
<i>syn</i>
/
<i>anti</i>
Selectivity of Tetrathiacycloalkadiynes and Mono(alkyne)cobalt Complexes
作者:Christoph Benisch、Daniel B. Werz、Rolf Gleiter、Frank Rominger、Thomas Oeser
DOI:10.1002/ejic.200390141
日期:2003.3
analogues (8b−8e) in order to probe the reactivity of electron-rich cyclic diynes. Both mono- [B(m.n)] and bis(cyclobutadiene) [C(m.n)] complexes were isolated as products of these reactions and the anti/syn ratio of C(m.n) was determined. For m, n < 4 the syn isomers dominate and this is attributed to the configuration of the intermediate metallacycle which is correlated with the conformations of the
用 [η2-双(叔丁基磺酰基)乙炔]羰基(η5-环戊二烯基)钴(I)处理环状四硫代炔烃,其中两个 1,4-二硫代炔烃单元与长度为 n 和 m 的烷烃桥连接 [A(mn)] ) (8a) 和几个取代的类似物 (8b-8e) 以探测富电子环状二炔的反应性。单-[B(mn)] 和双(环丁二烯) [C(mn)] 复合物均被分离为这些反应的产物,并确定了 C(mn) 的反/同步比。对于 m,n < 4,顺式异构体占主导地位,这归因于与单(环丁二烯)产物 B(mn) 中环的构象相关的中间金属环的构型。该分析得到了产品的 X 射线结构研究的证实。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)