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925669-95-0

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925669-95-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 925669-95-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,2,5,6,6 and 9 respectively; the second part has 2 digits, 9 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 925669-95:
(8*9)+(7*2)+(6*5)+(5*6)+(4*6)+(3*9)+(2*9)+(1*5)=220
220 % 10 = 0
So 925669-95-0 is a valid CAS Registry Number.

925669-95-0Relevant articles and documents

REMPI-MS and FTIR Study of NO2 and Oxirane Formation in the Reactions of Unsaturated Hydrocarbons with NO3 Radicals

Benter, Th.,Liesner, M.,Schindler, R. N.,Skov, H.,Hjorth, J.,Restelli, G.

, p. 10492 - 10496 (1994)

The yields of NO2 and oxirane have been studied as a function of pressure in the reactions of NO3 with selected unsaturated hydrocarbons.NO2 yields were determined using a flow system with double resonance REMPI-MS technique in the range 1-30 mbar, argon being the buffer gas.The yields of oxiranes were studied using in situ FTIR technique in a static system in the pressure range 30-1000 mbar.With styrene, oxirane formation was also determined by REMPI-MS.The experiments revealed that the NO2 yields decreased strongly with pressure in the case of aliphatic dienes and styrene, whereas only a negligible pressure dependence of NO2 formation was observed with alkenes or cyclic dienes.These results were confirmed for 2,3-dimethyl-2-butene and for isoprene in the FTIR experiments in which the corresponding oxirane yields were measured at up to 1000 mbar of argon.Air as buffer gas reduced oxirane formation.In the reaction of cis-2-butene and trans-2-butene with NO3 similar yields of trans-2,3-dimethyloxirane were obtained.This finding is taken as the most direct evidence for the NO3 radical addition to the carbon double bond in alkenes in the primary reaction step in agreement with previous assumptions.

Isomerization and Decomposition of 2,3-Dimethyloxirane. Studies with a Single-Pulse Shock Tube

Lifshitz, Assa,Tamburu, Carmen

, p. 10251 - 10260 (2007/10/02)

The isomerizations and decompositions of cis- and trans-2,3-dimethyloxirane were studied behind reflected shocks in a pressurized driver single-pulse shock tube over the temperature range 900-1150 K and overall densities of ca. 3*1E-5 mol/cm3.In addition to a cis trans structural isomerization, four isomerization products, methyl ethyl ketone, isobutyraldehyde, ethyl vinyl ether, and 2-butene-3-ol, were obtained under shock heating.A large number of decomposition products were also obtained.The major ones in decreasing order of abundance were CO, C2H4, C2H6, and CH4.In a similar manner to the decomposition of oxirane and methyloxirane, the free-radical reactions in the present system are initiated by a direct decomposition of a thermally excited methyl ethyl ketone which is produced in the course of the isomerization.A reaction scheme composed of 41 species and 65 elementary reactions accounts for the product distribution over the entire temperature range of this investigation provided decomposition channels of thermally excited isomers are included in the scheme.The rate constants obtained for the isomerization reactions are in good agreement with the values extrapolated from low temperatures.First-order Arrhenius rate parameters for the formation of the various reaction products are given and a sensitivity analysis for their production is summarized.

Stereocontrol of the Red Light Induced Photoepoxidation of 2-Butenes by Nitrogren Dioxide in Solide Ar

Nakata, Munetaka,Frei, Heinz

, p. 7670 - 7677 (2007/10/02)

Photooxidation of cis-2-butene was initiated in an inerrt gas matrix by exciting cis-2-butene*NO2 pairs at red, yellow, and green wavelengths .Chemical reaction was monitored by FT-IR spectroscopy, and emission from an Ar ion or a tuned CW dye laser was used for photolysis.As in the case of the trans-2-butene + NO2 reaction reported earlier, 2,3-epoxybutane was the only final oxidation product observed upon direct photolysis of reactant pairs.While in the case of the trans-2-butene reaction stereochemical retention was complete, we found in the cis case 85percent of the epoxide with retained configuration when conducting the reaction at low matrix concentration.This fraction decreased with increasing reactant to matrix ratio.Infrared bands of two conformers of a butyl nitrile radical were observed concurrently with the epoxide, one syn, the other anti with respect to conformation (CH3 groups) about the central CC bond.A correlation was found between the syn to anti nitrile radical and the cis to trans epoxide ratios, suggesting a common transient precursor.It is most probably an oxirane biradical, whose conformation determines the stereochemistry of the epoxide product.The photolysis wavelength dependence of the product growth kinetics was studied, and relative reaction efficiencies so obtained are shown to give insight into aspects of the dynamics of the reaction that relate to the observed product and stereospecificity.The two trapped butyl nitrite radical conformers were found to photodissociate under exposure to long-wavelength visible light with complete conformer specificity.The anti conformer gave trans-2-butene oxide and NO at a threshold wavelength of 613 nm, while the syn form was found to decompose to 2-methylpropanal and NO upon 573 nm and shoter wavelength irradiation.

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