Carbonyl–Olefin Metathesis Catalyzed by Molecular Iodine
作者:Uyen P. N. Tran、Giulia Oss、Martin Breugst、Eric Detmar、Domenic P. Pace、Kevin Liyanto、Thanh V. Nguyen
DOI:10.1021/acscatal.8b03769
日期:2019.2.1
The carbonyl–olefin metathesisreaction could facilitate rapid functional group interconversion and allow construction of complicated organic structures. Herein, we demonstrate that elemental iodine, a very simple catalyst, can efficiently promote this chemical transformation under mild reaction conditions. Our mechanistic studies revealed intriguing aspects of the activation mode via molecular iodine
作者:William D. Hoffman、William E. McEwen、Jacob Kleinberg
DOI:10.1016/0040-4020(59)80022-3
日期:1959.1
A series of diketones of the general formula C6H5CO(CH2nCOC6H5 has been prepared and subjected to “anodic reduction” in sodium iodide-pyridine solution between magnesium electrodes. In every case hydrolysis of the anolyte following electrolysis yielded a 1:2-diol as the reduction product as evidenced by titration with standard lead tetraacetate solution. The diketones, 1:3-dibenzoylpropane (n = 3)
制备了一系列通式为C 6 H 5 CO(CH 2 n COC 6 H 5)的二酮,并在镁电极之间的碘化钠-吡啶溶液中进行了“阳极还原”。用标准四乙酸铅溶液滴定证明生成了1:2-二醇作为还原产物,二酮1:3-二苯甲酰基丙烷(n = 3)和1:4-二苯甲酰基丁烷(n = 4)得到顺式-1 :2-二苯基环戊烷1:2二醇和顺式-1:2-二苯基环正己烷-1:2-二醇。假设其他二酮也产生环状1:2-二醇,则从阳极进入镁溶液的初始平均价数(V i)与环的大小之间存在显着的相关性。在最初溶解于溶液中的二酮生成最稳定的环状二醇的情况下,获得最低的V i值。对这些结果和观察到的腐蚀现象提供了解释。
α-Carbonyl Cations in Sulfoxide-Driven Oxidative Cyclizations
作者:Tobias Stopka、Meike Niggemann、Nuno Maulide
DOI:10.1002/anie.201705964
日期:2017.10.16
The selective, metal‐free generation of α‐carbonyl cations from simple internal alkynes was accomplished by the addition of a sulfoxide to a densely substituted vinyl cation. The high reactivity of the α‐carbonyl cations was found to efficiently induce hydrogen and even carbon shift reactions with unusual selecivities. Complex compounds with highly congested tertiary and all‐carbon‐substituted quartenary