| Abstract
| - Using quantum chemical and kinetic techniques, we show that the reaction between two HCN molecules under interstellar conditions cannot lead efficiently to a dimer of this species (H 2C 2N 2), whatever its structure. If the dimerization reaction does not occur efficiently, then it is impossible to synthesize detectable abundances of the pre-biotic HCN oligomer adenine (H 5C 5N 5) in the interstellar medium via successive neutral-neutral reactions between HCN and its dimer, trimer, and tetramer.
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