METHOD FOR MANUFACTURING AN EPOXY COMPOUND AND METHOD FOR EPOXIDIZING A CARBON-CARBON DOUBLE BOND
申请人:Takumi Kiyoshi
公开号:US20120108830A1
公开(公告)日:2012-05-03
The present invention provides a method for producing an epoxy compound, comprising oxidizing a carbon-carbon double bond of an organic compound by hydrogen peroxide in the presence of a neutral inorganic salt and a mixed catalyst of a tungsten compound (a), at least one phosphorus compound selected from the group consisting of phosphoric acids, phosphonic acids, and salts thereof (b) and a surfactant (c), and an epoxidizing method comprising oxidizing a carbon-carbon double bond by hydrogen peroxide in the presence of the catalyst and the neutral inorganic salt.
A purification method of a phosphoric ester, which comprises treating a crude phosphoric ester with an epoxy compound, heating the resultant in the presence of water, washing the resultant with water, and removing the residual water. The obtained phosphoric esters have low acid value and are excellent in physical properties such as heat resistance, resistance to hydrolysis and storage stability, and are useful as plasticizers and/or flame-retardants.
Catalytic epoxidation of monoterpenes with aqueous hydrogen peroxide catalyzed by peroxotung-stophosphate (PCWP) under biphase conditions using chloroform as the solvent was examined. A variety of terpenes was oxidized to the corresponding monoepoxides or diepoxides in good yields under mild conditions. For example, limonene (1) was converted into limonene oxide (la) in which the cyclohexene double bond was selectively epoxidized in almost quantitative yield. The oxidation of gamma-terpinene (2) with 2.2 equiv of 35% H2O2 took place with high stereoselectivity to give cis-diepoxide 2c. In terpenes bearing electron-withdrawing groups such as neryl acetate (3), geranyl acetate (4), citral (5), and geranyl nitrile (6), the double bonds remote from the substituents were epoxidized in preference to the others. The epoxidation of linalool (9) by the present catalyst-oxidant system produced the cyclic products, hydroxy furan 9a and hydroxy pyran 9b, rather than epoxide. tert-Butyl alcohol was successfully employed as the solvent by treating a hydrogen peroxide solution of tert-butyl alcohol with MgSO4 prior to use. The regioselectivities in the epoxidation of monoterpenes can be favorably explained from the electron densities of the double bonds which were estimated using the CAChe system.
US5616768A
申请人:——
公开号:US5616768A
公开(公告)日:1997-04-01
Olefin epoxidation using electricity as renewable power in a bromide-mediated electrochemical process
作者:Hongyang Tang、Jef R. Vanhoof、Dirk De Vos
DOI:10.1039/d2gc02883b
日期:——
Electrochemical bromide-mediated olefin epoxidation is a viable strategy to generate freely available bromine (FAB) in situ while minimizing process waste by avoiding chemical oxidants and reducing the use of hazardous reagents. Herein, an electrochemical bromide-mediated olefin epoxidation is presented, wherein bromide plays a double role, as an electrolyte, but also as a mediator that is easily oxidized