The cyclic alkynes 5-cyclononynone (23) and 5-cyclodecynone (24) were dimerized by heating with CpCo(CO)2 to form the tricyclic CpCo-stabilized cyclopentadienone derivatives 25 and 26, respectively. These diketones were transformed to the tricyclic diynes 30, 31, and 33, via the corresponding bis(selenadiazoles). Whereas the diynes 30 and 31 did not yield the desired bis(cyclopentadienono)phanes, we
The recently discovered novel concept of self-terminating, oxidative radical cyclizations, through which alkynes can be converted into carbonyl compounds under very mild reaction conditions usingO-centered inorganic and organicradicals as oxidants, is described.
描述了最近发现的自终止氧化自由基环化的新概念,通过该概念,炔烃可以在非常温和的反应条件下使用以 O 为中心的无机和有机自由基作为氧化剂转化为羰基化合物。