F:Flammable;
540-54-5Relevant articles and documents
LASER-INITIATED FREE-RADICAL CHLORINATION OF PROPANE IN AMORPHOUS THIN FILMS: TEMPERATURE DEPENDENCE FROM 15 TO 77 K
Sedlacek, Arthur J.,Wight, Charles A.
, p. 2821 - 2824 (1988)
The free-radical chlorination of propane, deposited as a thin amorphous film, has been investigated at temperatures ranging from 15 to 77 K.Reactions are initiated by pulsed laser photolysis of chlorine molecules at 308 nm.Product yields and branching ration are characterized by Fourier transform infrared absorption spectroscopy.The inherent reactivity of chlorine atoms toward secondary versus primary hydrogens (when corrected for the greater number of primary sites) decreases from 17:1 at 77 K to 2.3:1 at 60 K and below.Over the same temperature range the quantum yield is observed to increase from 0.12+/-0.02 to 0.70+/-0.06.These results reflect the onset of translationally excited (hot) chlorine atom reactions.
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Lee et al.
, p. 3778 (1968)
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Formation of C3H6 from the reaction C3H7 + O2 between 450 and 550 K
Kaiser
, p. 5903 - 5906 (1998)
The generation of C3H6 from the reaction C3H7 + O2 (1) has been investigated as a function both of temperature (450-550 K) at constant density (5.5 × 1018 molecules/cm3) and of pressure (55-550 Torr) at 490 K. The experiments were carried out by UV irradiation of mixtures of C3H8, Cl2, and O2 to generate propyl radicals. C3H8, C3H6, and C3H7Cl were monitored by gas chromatographic analysis. The propylene yield is 0.7% at 450 K. Based on these measurements and previous data at 298 K, the propylene yield has an apparent activation energy which is less than 2.5 kcal mol-1 below 450 K. Beginning near 450 K, the yield increases rapidly with an apparent activation energy of ～32 kcal mol-1, similar to previous observations on the generation of C2H4 from the reaction C2H5 + O2. At 490 K, the propylene yield from reaction 1 depends inversely on total pressure (YC3H6 ∝ P -0.6) between 55 and 550 Torr, while the overall value of k1 has a much smaller pressure dependence (P0.18). These observations show that above 450 K propylene is formed via reaction 1 through an excited propylperoxy adduct which can be stabilized by collision as was observed at 298 K.
Controlling the Lewis Acidity and Polymerizing Effectively Prevent Frustrated Lewis Pairs from Deactivation in the Hydrogenation of Terminal Alkynes
Geng, Jiao,Hu, Xingbang,Liu, Qiang,Wu, Youting,Yang, Liu,Yao, Chenfei
, p. 3685 - 3690 (2021/05/31)
Two strategies were reported to prevent the deactivation of Frustrated Lewis pairs (FLPs) in the hydrogenation of terminal alkynes: reducing the Lewis acidity and polymerizing the Lewis acid. A polymeric Lewis acid (P-BPh3) with high stability was designed and synthesized. Excellent conversion (up to 99%) and selectivity can be achieved in the hydrogenation of terminal alkynes catalyzed by P-BPh3. This catalytic system works quite well for different substrates. In addition, the P-BPh3 can be easily recycled.
Facile one-step synthesis of palladium tellurium alloy nanorods
Mariappan, Kadarkaraisamy,Varapragasam, Shelton J.P.,Hansen, Matthew R.,Rasalingam, Shivatharsiny,Alaparthi, Madhubabu,Sykes, Andrew G.
, p. 251 - 256 (2018/05/23)
A palladium-tellurium binary alloy nanomaterial was synthesized by a one-pot reaction of bis(4-methoxyphenyltelluro)methane [(4-CH3O-C6H4Te)2CH2](1) and allylpalladium (II)chloride dimer [(η3-C3H5)2Pd2(μ-Cl2)] (2) in 1:1 ratio using methylene chloride as solvent at ambient conditions. In addition to the Pd20Te7 alloy nanomaterial (3) generated, a palliadum (II) tellurolate complex [PdC1(μ-TeC6H4-OCH3)Te(C6H4-OCH3)2]2 (6), and other organic and organotellurim compounds were isolated as byproducts using column chromatography. The palladium-tellurium binary alloy nanomaterial and other byproducts from the reaction were characterized by powder X-ray diffraction (PXRD), NMR, GC-MS, transmission electron microscopy (TEM), and single crystal X-ray diffractions (XRD) methods. The palladium-tellurium binary alloy nanomaterial was obtained as single-phase Pd20Te7 nanorods, under mild conditions. TEM results indicated that the nanorods are less than 15 nm in diameter and range from 40 to 200 nm in length. A nanomaterial mixture was isolated with two binary-phases Pd20Te7 and Pd10Te3 when benzene was used as solvent. Compound 6 was successfully tested for catalytic activity for the Heck Reaction and produced a mixture of PdTe2 with Pd13Te3 nanomaterials as byproducts.
Propane chlorination over ruthenium oxychloride catalysts
Testova,Shalygin,Maksimov,Paukshtis,Parmon
, p. 428 - 433 (2015/08/04)
The gas-phase chlorination of propane over different catalysts, including those containing ruthenium oxychlorides as the active component, has been investigated. The propylene and chlorine-containing product formation selectivities in propane chlorination at 150-450°C in a fixed-bed flow reactor have been determined.
