53561-65-2Relevant articles and documents
Reactions of Ethynyl Radicals with Alkynes in the System Sodium Vapour/Ethynylbromide/Alkyne
Brachhold, H.,Alkemade, U.,Homann, K. H.
, p. 916 - 924 (2007/10/02)
The radicals were generated from the respective halide RX by the reaction Na + RX -> R + NaX in a low-pressure flow reactor fed by a multi-slit diffusion burner.Test results are reported for the system Na/CH3I giving k(Na + CH3I) = 6.0E13 and k(CH3 + CH3) = 2.8E13 cm3 mol-1 s-1.The main part deals with the production of C2H in the system Na/C2HBr and its consecutive reactions with C2HBr and added C2H2 and C4H2.The rate constant k(Na + C2HBr) was found to be 2.9E13 cm3 mol-1 s-1.The bimolecular rate constants of C2H with the compounds above have been determined to 1.0E14, 2.3E13 and 4.0E13 cm3 mol-1 s-1, respectively, at a temperature of 603 K. - The main products in this reaction system are polyynes with a minor formation of ethyne and very little hydrogenated polyynes.The formation of an aromatic compound (ethynylbenzene) is negligibly small, a fact which is discussed in its relation to aromates in hydrocarbon flames.The primary reacion Na + C2HBr and its products are discussed as well as the unimolecular decomposition and stabilization of energized adducts formed by C2H. - Chemical Kinetics / Elementary Reactions / Flames / Radicals
