Peroxides dimethyl

Symmetrical diaLkyl peroxides are commonly named as such, eg, dimethyl peroxide. For unsymmetrical diaLkyl peroxides, the two radicals usually are hsted ia alphabetical order, eg, ethyl methyl peroxide. For organomineral peroxides or complex stmctures, ie, where R and R are difficult to name as radicals, the peroxide is named as an aLkyldioxy derivative, although alkylperoxy is stUl used by many authors. CycHc peroxides are normally named as heterocychc compounds, eg, 1,2-dioxane, or by substitutive oxa nomenclature, eg, 1,2-dioxacyclohexane however, when the two oxygens form a bridge between two carbon atoms of a ring, the terms epidioxy or epiperoxy are frequendy used. The resulting polycycHc stmcture has been called an endoperoxide, epiperoxide, or transaimular peroxide. 

Dimethyl peroxide [690-02-8] M 62.1, b 13.5°/760mm, d 0.8677, n 1.3503. Purified by repeated trap-to-trap fractionation until no impurities could be detected by gas IR spectroscopy [Haas and Oberhammer J Am Chem Soc 106 6146 1984]. All necessary precautions should be taken in case of EXPLOSION. 

Dimethyl peroxide Diethyl peroxide Di-t-butyl-di-peroxyphthalate Difuroyl peroxide Dibenzoyl peroxide Dimeric ethylidene peroxide Dimeric acetone peroxide Dimeric cyclohexanone peroxide Diozonide of phorone Dimethyl ketone peroxide Ethyl hydroperoxide Ethylene ozonide Hydroxymethyl methyl peroxide Hydroxymethyl hydroperoxide... 

Dimethyl peroxide Diethyl peroxide Di-t-butyl-di-peroxyphthalate Difuroyl peroxide Dibenzoyl peroxide Dimeric ethylidene peroxide Dimeric acetone peroxide Dimeric cyclohexanone peroxide Diozonide of phorone Dimethyl ketone peroxide Ethyl hydroperoxide Ethylene ozonide Hydroxymethyl methyl peroxide Hydroxymethyl hydroperoxide 1-Hydroxyethyl ethyl peroxide 1 -Hydroperoxy-1 -acetoxycyclodecan-6-one Isopropyl percarbonate Isopropyl hydroperoxide Methyl ethyl ketone peroxide Methyl hydroperoxide Methyl ethyl peroxide Monoperoxy succinic acid Nonanoyl peroxide (75% hydrocarbon solution) 1-Naphthoyl peroxide Oxalic acid ester of t-butyl hydroperoxide Ozonide of maleic anhydride Phenylhydrazone hydroperoxide Polymeric butadiene peroxide Polymeric isoprene peroxide Polymeric dimethylbutadiene peroxide Polymeric peroxides of methacrylic acid esters and styrene... 

Di(fe/ f-butylpcroxy)butanc. 3565 Diethyl peroxide, 1699 Dimethyl peroxide, 0923 Dipropyl peroxide, 2547... 

Of the five dialkyl peroxides with enthalpy of formation data, only those of unquestioned accuracy, dimethyl, diethyl and ferf-butyl peroxide, are included in the analysis. The enthalpies of the formal hydrogenolysis reaction 6 are remarkably consistent for the methyl, primary and tertiary compounds -335.0 2.9 kJmoR for the liquid (using the estimated enthalpy of vaporization for dimethyl peroxide) and -279.5 3.5 kJmoR for... 

Disproportionation reaction 7 might be expected to be thermoneutral in the gas phase and perhaps less so in the liquid phase where there is the possibility of hydrogen-bonding. Only for gas phase dimethyl peroxide is the prediction true, where the reaction enthalpy is —0.2 kJmoD. The liquid phase enthalpy of reaction is the incredible —61.5 kJmoD. Of course, we have expressed some doubt about the accuracy of the enthalpy of formation of methyl hydroperoxide. For teri-butyl cumyl peroxide, the prediction for thermoneutrality is in error by about 6 kJmor in the gas phase and by ca 9 kJmoD for the liquid. The enthalpy of reaction deviation from prediction increases slightly for tert-butyl peroxide — 14kJmol for the gas phase, which is virtually the same result as in the liquid phase, — 19kJmol . The reaction enthalpy is calculated to be far from neutrality for 2-fert-butylperoxy-2-methylhex-5-en-3-yne. The enthalpies of reaction are —86.1 kJmoD (g) and —91.5 kJmol (Iq). This same species showed discrepant behavior for reaction 6. Nevertheless, still assuming thermoneutrality for conversion of diethyl peroxide to ethyl hydroperoxide in reaction 7, the derived enthalpies of formation for ethyl hydroperoxide are —206 kJmoD (Iq) and —164 kJmoD (g). The liquid phase estimated value for ethyl hydroperoxide is much more reasonable than the experimentally determined value and is consistent with the other n-alkyl hydroperoxide values, either derived or accurately determined experimentally. 

Table I gives the recently measured heats of formation of dimethyl, diethyl, and di-terf-butyl peroxides. Dimethyl peroxide had not previously been burned, but the values for diethyl and di-terf-butyl agreed well with previous work, and the small differences from them were in the expected direction (the heats of formation of unstable compounds, such as peroxides, tend to become more negative with successive measurement). The experimental values were used as standards for the calculation (8) of the group value O—0,C and Table I shows that group additivity is obeyed within the precision of the data.

Dimethyl Peroxide Extremely explosive on heating A. Rieche W. Brumshagen,... 

Berces and Trotman-Dickenson (5) pyrolyzed dimethyl peroxide and di-f erf-butyl peroxide at 190° to 260°C. in the presence of i-C4Hio. The ratio k3ick291/2/k32a was deduced where Reaction 31c is... 

Atmospheric oxidation of methane, 81 dimethyl peroxide from, 81 formaldehyde from, 81 formic acid from, 81... 

No evidence has been found that two methoxy radicals ever combine to give dimethyl peroxide, but they do disproportionate to give methanol and formaldehyde... 

Dimethyl peroxide, 0919 Dipropyl peroxide, 2542 Ethyl methyl peroxide, 1278 See PEROXIDES... 

---