The cyclic diynes 1 and 7-11 were allowed to react in supercritical (sc) ethylene under Pauson-Khand conditions to give the tricyclic diketones 4 and 12-16 in yields between 47% and 15%, respectively. Our investigations reveal that in the case of cyclic diynes the yields of Pauson-Khand reactions in organic solvents can be tripled, by carrying out the syntheses in supercritical ethylene. The geometry of the resulting sulfur substituted diones 14 and 15 was determined by means of X-ray analysis on single crystals. Additionally, the synthesis of the twofold tethered cyclopentadienes 17 and 18 and the bis(tricarbonyl-manganese) complexes 19a and 19b from tricyclic dione 4 is presented.
在 Pauson-Khand 条件下,环状二炔 1 和 7-11 在超临界(sc)
乙烯中发生反应,得到
三环二酮 4 和 12-16,产率分别为 47% 和 15%。我们的研究表明,对于环状二炔化合物,在超临界
乙烯中进行合成,有机溶剂中保森-汉德反应的产率可以提高两倍。通过对单晶体进行 X 射线分析,确定了
硫取代二炔 14 和 15 的几何形状。此外,还介绍了从
三环二酮 4 合成二重系
环戊二烯 17 和 18 以及双(三羰基-
锰)配合物 19a 和 19b。