Decomposition characterized

If we want to estimate the TMRad of the decomposition characterized above, at a lower temperature, for example, 120 °C, we can extrapolate the heat release rate as a function of temperature from 170 °C to 120 °C by using the calculated activation energy in Equation 11.3 ... 

Berthet, A., Thomann, A. L., Aires, F. J. C. S., Brun, M., Deranlot, G, Bertolini, J. C., Rozenbaum, J. P., Brault, P., and Andrezza, P., Comparison of bulk Pd/(Bulk SiC) catalysts prepared by atomic beam deposition and plasma sputtering decomposition Characterization and catalytic properties. J. Catal. 190, 49 (2000). 

Molar ratio of AdNp/(AdNp+3FHQ) decomposition characterized by 5.0% weight loss in... 

The reasonable stable products are characterized by an ir-absorption near 1615 cm". The 4-protons resonate near 6.2 ppm in the H NMR spectrum (23). NMR spectra exhibit a carbonyl atom signal near 173 ppm, whereas C-4 resonates near 8 108 these positions are characteristic of other mesoionic ring carbon atoms (24). In the mass spectra, decomposition with loss of CO, rupture of the 1,5 and 2.3 bonds with elimination of R NC2R 0 and cleavage of the 1,2 and 3,4 bonds with elimination of C2R 0S is observed (11)... 

Di(hydroperoxyall l) Peroxides. Low molecular weight di(hydroperoxyalkyl) peroxides (2, X = Y = OOH) are dangerously prone to explosive decomposition when they are pure. Some have been characterized by acylation to the corresponding diperoxyesters (2, X = Y = OOR, ... 

Photochemical decomposition of riboflavin in neutral or acid solution gives lumichrome (3), 7,8-dimethyl all oxazine, which was synthesized and characterized by Karrer and his co-workers in 1934 (11). In alkaline solution, the irradiation product is lumiflavin (4), 7,8,10-trimethyhsoalloxazine its uv—vis absorption spectmm resembles that of riboflavin. It was prepared and characterized in 1933 (5). Another photodecomposition product of riboflavin is 7,8-dimethy1-10-foTmylmethy1isoa11oxazine (12). 

CH2CN)4Yb[( J.-H)2BH]2, and (CgH N)4Yb[( J.-H)2BH4]2 have been stmcturally characterized by x-ray crystallography and shown to contain ytterbium to boron hydride Yb—H—B linkages. Thermal decomposition of lanthanaboranes can be used to generate lanthanide metal borides. 

The first major objective for the inherent safety review is the development of a good understanding of the hazards involved in the process. Early understanding of these hazards provides time for the development team to implement recommendations of the inherent safety effort. Hazards associated with flammability, pressure, and temperature are relatively easy to identify. Reactive chemistry hazards are not. They are frequently difficult to identify and understand in the lab and pilot plant. Special calorimetry equipment and expertise are often necessary to fully characterize the hazards of runaway reactions and decompositions. Similarly, industrial hygiene and toxicology expertise is desirable to help define and understand health hazards associated with the chemicals employed. 

Monomeric thiazyl halides NSX (X = F, Cl Br) have been characterized in the gas phase, but oligomerization to cyclic species, e.g., (NSX)3 (X = F, Cl) and (NSF)4, occurs in the condensed phase (Section 8.7). These ligands can be stabilized, however, by coordination to a transition metal. The NSF complexes are conveniently prepared in SO2 (Eq. 1.6) The monomeric fluoride NSF is conveniently generated in situ by thermal decomposition of FC(0)NSF2 or Hg(NSp2)2 (Section 8.2). 

AI(BH4)3 was the first fluxional compound to be recognized as such (1955) and its thermal decomposition led to a new compound which was the first to be discovered and structurally characterized by means of nmr ... 

An intensely colored by-product of the photolysis reaction of methyl-2-azidobenzoate has been identified as the first known derivative of 3,3 -diazaheptafulvalene 70 (94LA1165). Its molecular mass was established by elemental analysis and mass spectroscopy as that of a formal nitrene dimer, whereas and NMR studies demonstrated the twofold symmetry as well as the existence of a cross-conjugated 14 7r-electron system in 70. Involving l-azido-2,3-dimethoxy-5,6-dimethoxycarbonylbenzene in thermal decomposition reactions, the azaheptafulvalene 71 could be isolated and characterized spectroscopically and by means of X-ray diffraction. Tliis unusual fulvalene can be regarded as a vinylogous derivative of azafulvalenes (96JHC1333) (Scheme 28). 

Tlie isolable stable 1,2-dithietaiie, dithiatopazine (73), was prepared in 1988 and fully characterized (the name dithiatopazine was coined for its beautifully yellow-orange topazlike crystalline form) (87JA3801 88JA4856 90JA3029). Tlius, controlled photoirradiation of a dithiono-lactone (117) produced 73 in 65% yield along with an alkene 118 in 12% yield. Photolytic or thermal decomposition of 73 led to the alkene 118, a conversion that could be also carried out by a variety of reagents [m-BusShH-AIBN, Raney Ni, MCPBA, Fe2(CO)9, Mo(CO)6] in excellent yields. 

A later report has demonstrated that the initial product urorosein (144) is unstable and decomposes in solution into a variety of products. After extensive chromatography and characterization, it was concluded that several of the decomposition... 

DFT molecular dynamics simulations were used to investigate the kinetics of the chemical reactions that occur during the induction phase of acid-catalyzed polymerization of 205 [97JA7218]. These calculations support the experimental finding that the induction phase is characterized by the protolysis of 205 followed by a rapid decomposition into two formaldehyde molecules plus a methylenic carbocation (Scheme 135). For the second phase of the polymerization process, a reaction of the protonated 1,3,5-trioxane 208 with formaldehyde yielding 1,3,5,7-tetroxane 209 is discussed (Scheme 136). 

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