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Kinetic study of 2‐furanaldehyde, 3‐furanaldehyde, and 5‐methyl‐2‐furanaldehyde reactions initiated by Cl atoms
Author(s) -
Cabañas B.,
Tapia A.,
Villanueva F.,
Salgado S.,
Monedero E.,
Martín P.
Publication year - 2008
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.20348
Subject(s) - chemistry , reactivity (psychology) , chlorine atom , aldehyde , reaction rate constant , substituent , hydrogen atom , reaction mechanism , double bond , hydrogen atom abstraction , medicinal chemistry , hydrogen , photochemistry , organic chemistry , kinetics , catalysis , physics , quantum mechanics , medicine , alternative medicine , alkyl , pathology
Rate coefficients for the gas‐phase reactions of chlorine atoms with a series of furanaldehydes have been determined at 298 ± 2 K and atmospheric pressure (708.5 ± 0.1). The experiments were performed using the relative technique combined with solid‐phase microextraction (SPME) sampling and gas chromatography with flame ionization detection (GC‐FID). Rate constants were determined relative to the reaction of Cl with n ‐nonane and 2‐ethylfuran. The absolute rate coefficients k (in units of 10 −10 cm 3 molecule −1 s −1 ) obtained were 2.61 ± 0.27 for 2‐furaldehyde, 3.15 ± 0.27 for 3‐furaldehyde, and 4 ± 0.5 for 5‐methyl‐2‐furaldehyde. This study shows that the reactions of furanaldehydes and Cl are very fast with little influence of the position of the aldehyde group or the presence of other substituent on the reactivity. The results seem to indicate a mechanism involving two main reaction channels, addition of chlorine atom to the double bond of the aromatic ring, and the abstraction of the aldehydic hydrogen. Further product studies are necessary to determine the mechanism of these reactions in more detail. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 670–678, 2008