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has been complemented by more recent ␦ values for
several additional R; for this reason, the coefficients aX,
bX, cX, and dX in this work are slightly different from
those of ref. [6].
the more conventional reaction scheme CH2IO2
ϩ
CH2IO2 : CH2IO ϩ CH2IO ϩ O2, followed by CH2IO
(ϩM) : CH2O ϩ I (ϩM) and CH2I ϩ I (ϩM) :
CH2I2 (ϩM). The appearance of CH2OO biradicals
which were proposed in ref. [24] should lead to anom-
alies in the product distribution. However, typical per-
oxynitrate bands were observed at 1736, 1300, and 787
Ϫ
1
Ϫ
cm in addition to a band at 989 cm 1, and the time
dependence of these IR bands was completely analo-
geous to those observed in many other reaction systems
where peroxynitrates are formed after the preparation of
substituted alkyl radicals in the presence of both O2 and
NO2.
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