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We report the detection of linear and cyclic isomers of C3H and C3H2 towardsvarious starless cores and review the corresponding chemical pathways involvingneutral (C3Hx with x=1,2) and ionic (C3Hx+ with x = 1,2,3) isomers. Wehighlight the role of the branching ratio of electronic DissociativeRecombination (DR) reactions of C3H2+ and C3H3+ isomers showing that thestatistical treatment of the relaxation of C3H* and C3H2* produced in these DRreactions may explain the relative c,l-C3H and c,l-C3H2 abundances. We havealso introduced in the model the third isomer of C3H2 (HCCCH). The observedcyclic-to-linear C3H2 ratio vary from 110 + or - 30 for molecular clouds with atotal density around 1e4 molecules.cm-3 to 30 + or - 10 for molecular cloudswith a total density around 4e5 molecules.cm-3, a trend well reproduced withour updated model. The higher ratio for low molecular cloud densities is mainlydetermined by the importance of the H + l-C3H2 -> H + c-C3H2 and H + t-C3H2 ->H + c-C3H2 isomerization reactions.

The interstellar chemistry of C3H and C3H2 isomers