- Chlorination of hydrocarbons with CCl4 catalyzed by complexes of Mn, Mo, V, Fe
-
Catalytic chlorination of alkanes, cycloalkanes, and adamantane utilizing tetrachloromethane as the source of chlorine and applying catalysts containing manganese, molybdenum, vanadium, and iron activated with nitrile ligands, alcohols, and water was fulfilled. The optimum ratios of catalysts and reagents and the best reaction conditions were found for selective synthesis of chlorine-substituted hydrocarbons derivatives. Pleiades Publishing, Ltd., 2013.
- Khusnutdinov,Shchadneva,Bayguzina,Oshnyakova,Mayakova,Dzhemilev
-
-
Read Online
- Characterization of polychlorinated alkane mixtures - A Monte Carlo modeling approach
-
A Monte Carlo model was developed to characterize the molecular composition of polychlorinated alkane mixtures. The model is based upon a simulation of the free-radical chlorination process by which polychlorinated alkane mixtures are produced industrially from n-alkanes. In the model, the free-radical chlorination reaction was simulated by randomly selecting a position on a partially converted alkane molecule for target by chlorine free-radical attack. The relative reactivities of the hydrogen atoms on the alkane chain towards chlorine free-radical substitution were either determined experimentally or extrapolated from experimental results and incorporated into the model. The result of the simulation is the prediction of the detailed molecular composition of any PCA mixture. Good agreement was found when comparing the distribution of molecules predicted by the model to analytically determined distributions of real PCA mixtures. Results from the model were then coupled with rules describing the action of biological enzymes to estimate the upper limit possible for the aerobic biodegradation of PCA mixtures.
- Jensen, Soren R.,Brown, Wayne A.,Heath, Ester,Cooper, David G.
-
-
Read Online
- Proton acceptor site selectivity in the proton transfer from heptane radical cations to decane molecules in γ-irradiated heptane/decane/ 1-chloroheptane crystals at 77 K
-
A study is made of the yield and isomeric composition of chlorodecanes formed by γ-irradiation of heptane/decane/ 1-chloroheptane crystals at 77 K and subsequent warming. It is observed that in such systems 2-chlorodecane is predominantly formed with smaller yields of the other chlorodecane isomers, in isomers, in analogy with observations of γ-irradiated CCl3F/decane. The selective formation of 2-chlorodecane is attributed to proton transfer from heptane radical cations to decane molecules, (n-C7H16·+ + n-C10H22→ 1-C7H15· + n-C10H23+), followed by neutralization of the so-formed protonated decanes by chloride ions upon warming. The results confirm that, when different secondary C-H bonds in neutral n-alkane molecules are directly accessible to the planar chain-end C-H bonds in n-alkane radical cations from which proton donation takes place, proton transfer occurs preferentially to the penultimate position (intrinsic acceptor site selectivity). Comparison of the isomeric composition of the chlorodecanes in heptane/decane/1-chloroheptane and CCl3/decane, on the other hand, clearly points to structurally-determined acceptor site selectivity with respect to the inner C-H bonds of decane in the heptane system.
- Slabbinck, Lutgart,Demeyer, Adelheid,Ceulemans, Jan
-
p. 2241 - 2247
(2007/10/03)
-