Products of the gas-phase reactions of o-, m- and p-xylene with the OH radical in the presence and absence of NOx
Abstract
The products of the gas-phase reactions of the OH radical
with o-, m- and p-xylene, in the
presence and absence of NO
x
, have been
investigated using direct air sampling, atmospheric-pressure
ionisation tandem mass spectrometry (API–MS).
Partially and fully deuteriated xylenes were also studied.
In addition to ion peaks due to tolualdehydes and
dimethylphenols, ion peaks observed from the xylene,
[
2
H
6
]xylene and
[
2
H
10
]xylene reactions are attributed
to the [M+H]
+
ions of the
C
4
-unsaturated dicarbonyl HC(O)CH![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
CHCHO,
C
5
-unsaturated dicarbonyls such as
CH
3
C(O)CHCHCHO and its isomers,
C
6
-unsaturated dicarbonyls such as
CH
3
C(O)CHCHC(O)CH
3
and its
isomers, C
8
-di-unsaturated dicarbonyls such as
CH
3
C(O)C(CH
3
)CHCHCHCHO
and its isomers, C
8
-unsaturated epoxy-dicarbonyls
and, possibly, C
8
-epoxy-cyclohexenones, and their
partially and fully deuteriated analogues. Possible reaction
mechanisms leading to the observed products are presented.
CHCHO,
C
5
-unsaturated dicarbonyls such as
CH
3
C(O)CHCHCHO and its isomers,
C
6
-unsaturated dicarbonyls such as
CH
3
C(O)CHCHC(O)CH
3
and its
isomers, C
8
-di-unsaturated dicarbonyls such as
CH
3
C(O)C(CH
3
)CHCHCHCHO
and its isomers, C
8
-unsaturated epoxy-dicarbonyls
and, possibly, C
8
-epoxy-cyclohexenones, and their
partially and fully deuteriated analogues. Possible reaction
mechanisms leading to the observed products are presented.
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