Highly facile homogeneous epoxidation of olefins using oxo-diperoxo tungstate(vi) complex as catalyst, bicarbonate as co-catalyst and hydrogen peroxide as a terminal oxidant
作者:Swarup K. Maiti、Subhajit Dinda、Narottam Gharah、Ramgopal Bhattacharyya
DOI:10.1039/b514258j
日期:——
representative olefin) in a 1∶1 molar ratio producing cyclopentene oxide and itself is converted to PPh4[WO2(O2)(QO)] 5. If the above reaction is conducted at a 1∶2 molar ratio (instead of 1∶1) then 2 moles of the corresponding epoxide is formed and 4 is converted to PPh4[WO3(QO)] 6. All these peroxo complexes have remarkable catalytic efficiencies in the epoxidation of olefinic compounds when used in tandem
The organoselenium-mediated reduction of α,β-epoxyketones has been demonstrated to be a promising entry to a variety of cyclic and acyclic aldols.
已经证明有机硒介导的α,β-环氧酮的还原是各种环状和非环状醛醇的有前途的进入。
Zincate-mediated rearrangement reaction of 2-(1-hydroxyalkyl)-1-alkylcyclopropanol
作者:Kenichi Nomura、Seijiro Matsubara
DOI:10.1039/b901043b
日期:——
A rearrangement of lithium alkoxide of 2-(1-hydroxyalkyl)-1-alkylcyclopropanol into lithium alkoxide of vic-diol was mediated with an organozincate complex.
consisting of inexpensive manganese salts, picolinic acid and various heterocycles enable epoxidation of the challenging (terminal) unactivated olefins, selective C–H oxidation of unactivated alkanes, and O–H oxidation of secondary alcohols with aqueous hydrogenperoxide. In the presence of the in situ generated optimal manganese catalyst, epoxides are generated with up to 81% yield from alkenes and ketone
Selective oxidation of alcohols and aldehydes with hydrogen peroxide catalyzed by methyltrioctylammonium tetrakis(oxodiperoxotungsto)phosphate(3-) under two-phase conditions
作者:Carlo Venturello、Mario Gambaro
DOI:10.1021/jo00020a040
日期:1991.9
The use of methyltrioctylammonium tetrakis(oxodiperoxotungsto)phosphate(3-) (1c) in combination with hydrogen peroxide as the primary oxidant in an aqueous/organic biphase system provides a cheap, efficient, and versatile catalytic method for alcohol and aldehyde oxidation. By this method, a variety of water-insoluble primary and secondary alcohols and aldehydes were oxidized to carboxylic acids and ketones in good yields under mild conditions and after relatively short reaction times.