Updating rate rules of di-allylic radical + allylic radical
for disproportionation family

Estimating rate coefficient for cyclopentadienyl radical + butadieneyl radical
NIST estimate for allyl + iso-butyl is 8E+11 at 1000 K, however in our
system the butadieneyl radical is also resonance stabilized
and it will be harder to break the bond to give butadiene +
cyclopentadiene. Currently estimate it to be a factor of 5 slower.

These calculations often require multi-reference calculations, for now I am
making my best estimate!