Smog chamber/FTIR techniques were used to study the Cl atom initiated oxidation of CH 2 FOCH 2 F in 700 Torr of N 2 /O 2 at 296 K. Relative rate techniques were used to measure k(Cl + CH 2 FOCH 2 F) = (4.6 ± 0.7) × 10 −13 and k(Cl + CH 2 FOC(O)F) = (2.9 ± 0.8) × 10 −15 (in units of cm 3 molecule −1 s −1 ). Three competing fates for alkoxy radical CH 2 FOCHFO· formed in the self-reaction of the corresponding peroxy radicals were identified. In 1 atm of air at 296 K, 48 ± 3% of CH 2 FOCHFO· radicals decompose via C O bond scission, 21 ± 4% react with O 2 , and 31 ± 4% undergo hydrogen atom elimination. Chemical activation effects were observed for CH 2 FOCHFO· radicals formed in the CH 2 FOCHFOO· + NO reaction. Infrared spectra of CH 2 FOC(O)F and FC(O)OC(O)F, which are produced during the Cl atom initiated oxidation of CH 2

A series of substituted N,N-dimethyl-N'-pyridylformamidines has been synthesised and the pK, values of the conjugate acids have been measured in water at 25°C. Consideration of the pK, values shows that initial protonation is predominantly on the imino nitrogen of the amidine system rather than on the pyridyl nitrogen. The effect of the protonation on the 'H and 13C NMR spectra of the amidines is discussed.In general, protonation of the amidine functional group N=C-N occurs on the imino nitrogen (la) rather than the amino l a l b .N-CHa I CH, X 2 5Me 3 4-Me

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