In figure we show the experimentally recorded relative branching ratio for events collected from breakup of doubly charged daughter molecular ions formed after loss of one or more neutral particles (H/H 2 ) from the butadiene dication leading to indirect asymmetric CE. For comparison, the events collected due to the asymmetric CE of intact butadiene dication are also shown. From this figure, we note that the indirect asymmetric CE is ≈200% more likely than direct asymmetric CE. Thus an internally hot and unstable butadiene dication has a very high probability of evaporating neutral particles prior to fragmentation. The results of our MD simulations are in good agreement with the observed high propensity of neutral particle emission for butadiene dications. Such intense dehydrogenation is expected to change the abundance of hydrogen in astrophysical environments, in analogy with the case of PAH molecules . Ion molecule chemistry involving [C 4 H n ] + leading to formation of 6membered C-ring cations is a proposed route for molecular growth . Several of these fragments in neutral forms are computationally determined as precursors for 6-membered rings .