Reaction (R2b) has the highest branching ratio compared to the
other 2 channels. It has a ratio of 0.66 at 1209 K. (R2c) and (R2a)
have branching ratios of 0.19 and 0.15, respectively. Similar to what
has been done for 2-butanone, the branching ratios are kept unchanged
while fitting the data to obtain k2, total (k2a + k2b + k2c)