4786-19-0Relevant articles and documents
Elimination kinetics of β-hydroxynitriles in the gas phase
Chuchani, Gabriel,Dominguez, Rosa M.,Rotinov, Alexandra,Quijano, Jairo,Valencia, Cristina,Vicente, Bernardo,Franco, Dimas
, p. 19 - 23 (2007/10/03)
The gas-phase elimination kinetics of primary, secondary and tertiary β-hydroxynitriles were examined in static seasoned vessels over the temperature range 360-450 °C and pressure range 47-167 Torr (1 Torr = 133.3 Pa). These reactions are homogeneous, unimolecular and follow a first-order rate law. The rate coefficients are given by the Arrhenius equation: for 3-hydroxypropionitrile log k1 = (14.29 ± 0.47) - (234.9 ± 6.3) kJ mol-1 (2.303 RT)-1; for 3-hydroxybutyronitrile log k1 = (13.76 ± 0.10) - (222.6 ± 0.7) kJ mol-1 (2.303RT)-1; and for 3-hydroxy-3-methylbutyronitrile log k1 (s-1) = (13.68 ± 0.68) - (212.5 ± 8.7) kJ mol-1 (2.303RT)-1. The decomposition rates of the β-hydroxynitriles increase from primary to tertiary carbon containing the OH group. The rates for the β-hydroxynitriles are found to be slower than those for the corresponding β-hydroxyacetylene analogs. The value of log A from 13.7 to 14.4 and the small positive ΔS≠ indicate a mechanism different from a six-centered cyclic transition state. These data appear to indicate that a four-membered cyclic transition state or a quasi-heterolytic mechanism is conceivable. Copyright
Production of Acrylonitrile and Other Unsaturated Nitriles from Hydrocarbons Using a Plasma
Henis, Neil B.H.,So, Ying-Hung,Miller, Larry L.
, p. 4632 - 4633 (2007/10/02)
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