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Recent interstellar detections include a significant number of moleculescontaining vinyl (C2H3) and ethyl (C2H5) groups in their structure. For severalof these molecules, there is not a clear experimental or theoretical evidencethat support their formation from simpler precursors. We carried out asystematic search of viable reactions starting from closed shell hydrocarbonscontaining two carbon atoms (ethane, C2H6; ethylene, C2H4; and acetylene, C2H2)with the goal of determining viable chemical routes for the formation of vinyland ethyl molecules on top of interstellar dust grains. Our results show thatboth H and OH radicals are key in converting acetylene and ethylene into morecomplex radicals that are susceptible to continue reacting and forminginterstellar complex organic molecules. The relevant reactions, for example OHadditions, present rate constants above 10$^{1}$ s$^{-1}$ that are likelycompetitive with OH diffusion on grains. Similarly, H atom addition toacetylene and ethylene is a very fast process with rate constants above10$^{4}$ s$^{-1}$ in all cases, and greatly enhanced by quantum tunneling.Hydrogen abstraction reactions are less relevant, but may play a role inspecific cases involving the OH radical. Reactions with other radicals NH2, CH3are likely to have a much lesser impact in the chemistry of ethyl and vinylbearing molecules.

Radical Addition and H Abstraction Reactions in C2H2, C2H4 and C2H6: A Gateway for Ethyl and Vinyl Bearing Molecules in the Interstellar Medium