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We address the deficiency of odd-Z elements P, Cl, K and Sc in galacticchemical evolution models through an investigation of the nucleosynthesis ofinteracting convective O- and C shells in massive stars. 3D hydrodynamicsimulations of O-shell convection with moderate C-ingestion rates show nodramatic deviation from spherical symmetry. We derive a spherically averageddiffusion coefficient for 1D nucleosynthesis simulations which show that suchconvective-reactive ingestion events can be a production site for P, Cl, K andSc. An entrainment rate of $10^{-3}{{\rm M}_\odot}$/s features overproductionfactors $OP_\mathrm{s} \approx 7$. Full O-C shell mergers in our 1D stellarevolution massive star models have overproduction factors $OP_\mathrm{m}>1\mathrm{dex}$ but for such cases 3D hydrodynamic simulations suggest deviationsfrom spherical symmetry. p-process species can be produced with overproductionfactors of $OP_\mathrm{m}>1 \mathrm{dex}$, e.g. for $^{130,132}Ba$. Using theuncertain prediction of the $15{{\rm M}_\odot}$, $Z=0.02$ massive star model($OP_\mathrm{m} \approx 15$) as representative for merger or entrainmentconvective-reactive events involving O- and C-burning shells, and assume thatsuch events occur in more than 50% of all stars, our chemical evolution modelsreproduce the observed Galactic trends of the odd-Z elements.

Convective-reactive nucleosynthesis of K, Sc, Cl and p-process isotopes in O-C shell mergers