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Methyl cyanide (CH$_3$CN) is one of the most abundant and widely spreadinterstellar complex organic molecules (iCOMs). Several studies found that, inhot corinos, methyl cyanide and methanol abundances are correlated suggesting achemical link, often interpreted as a synthesis of them on the interstellargrain surfaces. In this article, we present a revised network of the reactionsforming methyl cyanide in the gas-phase. We carried out an exhaustive review ofthe gas-phase CH$_3$CN formation routes, propose two new reactions andperformed new quantum mechanics computations of several reactions. We foundthat 13 of the 15 reactions reported in the databases KIDA and UDfA haveincorrect products and/or rate constants. The new corrected reaction networkcontains 10 reactions leading to methyl cyanide. We tested the relativeimportance of those reactions in forming CH$_3$CN using our astrochemicalmodel. We confirm that the radiative association of CH${_3}{^+}$ and HCN,forming CH$_{3}$CNH$^{+}$, followed by the electron recombination ofCH$_{3}$CNH$^{+}$, is the most important CH$_3$CN formation route in both coldand warm environments, notwithstanding that we significantly corrected the rateconstants and products of both reactions. The two newly proposed reactions playan important role in warm environments. Finally, we found a very good agreementbetween the CH$_3$CN predicted abundances with those measured in cold ($\sim$10K) and warm ($\sim$90 K) objects. Unexpectedly, we also found a chemical linkbetween methanol and methyl cyanide via the CH$_{3}^{+}$ ion, which can explainthe observed correlation between the CH$_3$OH and CH$_3$CN abundances measuredin hot corinos.

Revised gas-phase formation network of methyl cyanide: the origin of methyl cyanide and methanol abundance correlation in hot corinos