Efficient Epoxidation of Alkenes with Aqueous Hydrogen Peroxide Catalyzed by Methyltrioxorhenium and 3-Cyanopyridine
作者:Hans Adolfsson、Christophe Copéret、Jay P. Chiang、Andrei K. Yudin
DOI:10.1021/jo005623+
日期:2000.12.1
The epoxidation of alkenes with 30% aqueous hydrogen peroxide is catalyzed efficiently by methyltrioxorhenium (MTO) in the presence of pyridine additives. The addition of 1-10 mol % of 3-cyanopyridine increases the system's efficiency for terminal and trans-disubstituted alkenes resulting in high isolated yields of the corresponding epoxides. The system allows for epoxidation of alkenes with various
Olefin Epoxidation with Bis(trimethylsilyl) Peroxide Catalyzed by Inorganic Oxorhenium Derivatives. Controlled Release of Hydrogen Peroxide
作者:Andrei K. Yudin、Jay P. Chiang、Hans Adolfsson、Christophe Copéret
DOI:10.1021/jo010369m
日期:2001.6.1
using bis(trimethylsilyl) peroxide (BTSP) as oxidant in place of aqueous H(2)O(2). Using a catalytic amount of a proton source, controlled release of hydrogen peroxide helps preserve sensitive peroxorhenium species and enables catalytic turnover to take place. Systematic investigation of the oxorheniumcatalyst precursors, substrate scope, and effects of various additives on olefinepoxidation with
Reaction routes in catalytic reforming of poly(3-hydroxybutyrate) into renewable hydrocarbon oil
作者:Shimin Kang、Jian Yu
DOI:10.1039/c5ra03195h
日期:——
ketonization of crotonic acid. The main aromaticcompounds are formed in stage (3) from propylene and 2,3-dimethyl-2-cyclopenten-1-one as two key intermediates, the former from decarboxylation and the latter from ketonization of crotonic acid. The reaction routes reveal that the formation of aromatics is affected to a great extent by the concentrations of phosphoric acid and water in the reaction, which