Alumina-supported Molybdenum (VI) Oxide: An Efficient and Recyclable Heterogeneous Catalyst for Regioselective Ring Opening of Epoxides with Thiols, Acetic Anhydride, and Alcohols under Solvent-free Conditions
作者:Sweety Singhal、Suman L. Jain、Bir Sain
DOI:10.1246/cl.2008.620
日期:2008.6.5
An efficient and simple protocol for regioselective ring opening of epoxides with thiols, aceticanhydride, and alcohols using 16 wt % MoO3 supported on alumina as a recyclable catalyst is described.
Mechanisms for Manganese(III) Oxidations with Alkenes
作者:William E. Fristad、John R. Peterson、Andreas B. Ernst、Gordon B. Urbi
DOI:10.1016/s0040-4020(01)87310-5
日期:1986.1
metal complexed organic radicals, and the importance of an oxo-centered manganese(III) triangle are discussed as they relate to the lactone annulation reaction. Single electron transfer oxidation of alkenes is described as a route toward 1,2-diacetates of alkenes within the 8.1-7.5 eV I.P. range. Three less common modes of Mn(III) reaction are discussed and compared with the two primary processes of
在乙酸锰(III)与羧酸和烯烃的反应中,已经鉴定出三个不同的过程,它们涉及烯烃和两个独立于烯烃的过程。通过产品研究,重排,稀释实验和文献动力学数据的组合,可以提出一个统一的机制图来描述这些过程。具体地,讨论了羧酸组分的α-H酸的作用,缺电子的自由基加成,金属络合的有机自由基以及以氧代为中心的锰(III)三角形的重要性,因为它们与内酯环化反应有关。烯烃的单电子转移氧化被描述为通往8.1-7.5 eV IP范围内的烯烃1,2-二乙酸酯的途径。
Iron-Catalyzed Dioxygenation of Alkenes and Terminal Alkynes by using (Diacetoxyiodo)benzene as Oxidant
作者:B. T. V. Srinivas、Vikas S. Rawat、Bojja Sreedhar
DOI:10.1002/adsc.201500681
日期:2015.11.16
syn-diacetoxylation of alkenes and 1,2-oxyacetoxylation of terminal alkynes has been developed using (diacetoxyiodo)benzene as oxidant. A broad range of internal and terminal alkenes, including electron-rich as well as electron-deficient alkenes, gave the desired products in good to excellent yields with high diastereoselectivity (up to >99:1 dr). In addition the high catalytic activity of ironcatalysis for the
A good linear free energy relationship was observed between the radical reactivity of the sonochemical reactions of 4-substituted styrenes with leadtetraacetate and the vapor pressure of the styrenes, indicating a probable control of the process by an intra-bubble activation.
1-Fluoro-1-sulfonyloxylation of Alkenes by Sterically and Electronically Tuned Hypervalent Iodine: Regression Analysis toward 1,1-Heterodifunctionalization
the heterodifunctionalization of alkenes, 1,1-regioselectivity remains elusive in sharp contrast to 1,2-regioselectivity. Herein, the 1-fluoro-1-sulfonyloxylation of styrenes with Bu4NBF4 and sulfonic acids using a hypervalent iodine ArI(OAc)2 is reported. Regression analysis of substituents on ArI(OAc)2 suggested that their electron-withdrawing ability and steric factor influence the 1,1-heterodifunctionalization
在烯烃的异双功能化中,1,1-区域选择性与 1,2-区域选择性形成鲜明对比,仍然难以捉摸。在此,报道了使用高价碘 ArI(OAc) 2对苯乙烯与 Bu 4 NBF 4和磺酸进行1-氟-1-磺酰氧基化反应。ArI(OAc) 2上取代基的回归分析表明它们的吸电子能力和空间因素影响1,1-异双功能化。我们设计了o -2,4-(CF 3 ) 2 C 6 H 3 }-和p -NO 2 -取代的ArI(OAc) 2通过回归分析实现高选择性。