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The recent discovery of terrestrial-type organic species such as methylformate and dimethyl ether in the cold interstellar gas has proved that theformation of organic matter in the Galaxy begins at a much earlier stage ofstar formation than was thought before. This discovery represents a challengefor astrochemical modelers. The abundances of these molecules cannot beexplained by the previously developed "warm-up" scenario, in which organicmolecules are formed via diffusive chemistry on surfaces of interstellar grainsstarting at 30 K, and then released to the gas at higher temperatures duringlater stages of star formation. In this article, we investigate an alternativescenario in which complex organic species are formed via a sequence ofgas-phase reactions between precursor species formed on grain surfaces and thenejected into the gas via efficient reactive desorption, a process in whichnon-thermal desorption occurs as a result of conversion of the exothermicity ofchemical reactions into the ejection of products from the surface. The proposedscenario leads to reasonable if somewhat mixed results at temperatures as lowas 10 K and may be considered as a step towards the explanation of abundancesof terrestrial-like organic species observed during the earliest stages of starformation.

Reactive Desorption and Radiative Association as Possible Drivers of Complex Molecule Formation in the Cold Interstellar Medium