Regioselective Alkene Carbon−Carbon Bond Cleavage to Aldehydes and Chemoselective Alcohol Oxidation of Allylic Alcohols with Hydrogen Peroxide Catalyzed by [<i>cis-</i>Ru(II)(dmp)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>]<sup>2+</sup> (dmp = 2,9-dimethylphenanthroline)
作者:Vladimir Kogan、Miriam M. Quintal、Ronny Neumann
DOI:10.1021/ol052025e
日期:2005.10.1
to the corresponding aldehydes as an alternative to ozonolysis. Secondary alkenes were much less reactive, leading to regioselective oxidation of substrates such as 4-vinylcyclohexene and 7-methyl-1,6-octadiene at the terminal position. Primary allylic alcohols were chemoselectively oxidized to the corresponding allylic aldehydes, e.g., geraniol to citral.
spectrometry show that reaction of I with excess hydrogen peroxide leads to fast formation of a diperoxo species, [TBA](4)[gamma-SiW(10)O(32)(O(2))(2)] (II), with retention of a gamma-Keggin type structure. Whereas the isolated compoundII is inactive for stoichiometric epoxidation of cyclooctene, epoxidation with II does proceed in the presence of hydrogen peroxide. The reaction of II with hydrogen peroxide
Metal-catalyzed organic photoreactions. Chemo- and regioselectivities in the CuCl2-induced photooxidation of olefins
作者:Tadashi Sato、Shin-ichi Yonemochi
DOI:10.1016/s0040-4020(01)90468-5
日期:——
Copper(II) chloride induced the chemo and regioselective chlorohydroperoxidation, as well as the site-selective chlorination of olefins, under photooxygenation conditions.
氯化铜(II)在光氧合条件下诱导了化学和区域选择性的氯代氢过氧化作用,以及烯烃的位点选择性氯化。
Chemoselective epoxidation of dienes using polymer-supported manganese porphyrin catalysts
作者:Emile Brulé、Yolanda R de Miguel、King Kuok (Mimi) Hii
DOI:10.1016/j.tet.2004.05.026
日期:2004.7
Manganeseporphyrincatalysts supported on different polymer resins were assessed in the selective epoxidation of three dienes. The recyclability of the catalysts was examined.
在三个二烯的选择性环氧化中,评估了负载在不同聚合物树脂上的锰卟啉催化剂。检查了催化剂的可回收性。
Fluorinated Alcohols: Effective Solvents for Uncatalysed Epoxidations with Aqueous Hydrogen Peroxide
作者:Michiel C. A. van Vliet、Isabel W. C. E. Arends、Roger A. Sheldon
DOI:10.1055/s-2001-10766
日期:——
Buffered aqueous hydrogen peroxide in combination with fluorinated alcohols (trifluoroethanol at reflux temperature or hexafluoro-2-propanol at room temperature) oxidises a variety of alkenes to the corresponding epoxides in high rates and fairly high yields, without the need for any catalyst.