PEROXIDES IN SOLVENTS

Syn-hydroxylation of alkenes is also effected by a catalytic amount of osmium tetroxide in the presence of hydrogen peroxide. Originally developed by Milas, the reaction can be performed with aqueous hydrogen peroxide in solvents such as acetone or diethyl ether.58 Allyl alcohol is quantitatively hydroxylated in water (Eq. 3.12).59... 

PEROXIDATION INCIDENTS PEROXIDATION IN SOLVENTS PEROXIDISABLE COMPOUNDS... 

See ethers, peroxides in solvents See other peroxidisable compounds... 

MOLECULAR SIEVE INCIDENTS ethylene ORGANIC POWDER HANDLING PEROXIDES IN SOLVENTS SOLVATED OXOSALT INCIDENTS Cadmium propionate, 2418 Calcium acetylide Methanol Diazomethane Calcium sulfate, 0406 3,5 -Dinitrotoluamide... 

See PEROXIDES IN SOLVENTS, PEROXIDISABLE COMPOUNDS See related UNIT PROCESS OR UNIT OPERATION INCIDENTS... 

Many laboratory accidents have been ascribed to presence of peroxides in solvents, usually, but not exclusively ethers. Storage of the solvents for over-long periods,... 

RATE COEFFICIENTS FOR THE REACTIONS OF BORONIC ACIDS WITH HYDROGEN PEROXIDE IN SOLVENT WATER AT 25 °C16... 

MOLECULAR SIEVE INCIDENTS Ethylene ORGANIC POWDER HANDLING PEROXIDES IN SOLVENTS SOLVATED OXOSALT INCIDENTS... 

Many laboratory accidents have been ascribed to presence of peroxides in solvents, usually, but not exclusively ethers. Storage of the solvents for over-long periods, often under poor conditions, is a common feature of the incidents. When peroxides are removed from solvents by chromatographic adsorption on alumina columns, the concentrated band of strongly adsorbed peroxides at the top of the column may become hazardous if the solvent evaporates [1], The use of self-indicating molecular sieve under nitrogen is described as an effective method of de-peroxidising THF, diethyl and dipropyl ethers, suitable also for bulk-scale operations [2]. 

The rates of photodecomposition of rf-r-butyl peroxide in solvents of varying viscosity are presented in Table 68. Although no simple function of viscosity results in a correlation with the rate data, it is apparent that cage recombination of r-butoxy radicals occurs. The cage effect was also invoked to explain the variation in the volume of activation with changing solvent (Table 69) . 

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