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Aims: A unique environment to study how interstellar Complex OrganicMolecules (iCOMs) can be formed is the shocked gas along low-mass protostellaroutflows, as the dust mantles composition is sputtered into the gas phase. Thechemical richness in these environments has been so far studied only in theL1157 blue shifted outflow. Methods: To understand if the L1157-B1 case isunique, we imaged the NGC 1333 IRAS 4A outflows using the NOEMA (NOrthernExtended Millimeter Array) interferometer as part of the IRAM SOLIS (Seeds OfLife in Space) Large Program and compared the observations with the GRAINOBLE+gas phase astrochemical model. Results: Several iCOMs were detected in the IRAS4A outflows: methanol (CH$_3$OH), acetaldehyde (CH$_3$CHO), formamide(NH$_2$CHO) and dimethyl ether (CH$_3$OCH$_3$), all sampling upper excitationenergy up to $\sim$30 K. We found a significant chemical differentiationbetween the IRAS 4A1 outflow, showing a richer molecular content, and the IRAS4A2 one. The CH$_3$OH/CH$_3$CHO abundance ratio is lower by a factor $\sim$4 inthe former; furthermore the ratio in both outflows is lower by a factor$\sim$10 with respect to hot corinos values. Conclusions: After L1157-B1, IRAS4A outflow is now the second outflow to show an evident chemical complexity.Given that CH$_3$OH is a grain surface species, GRAINOBLE+ reproduced ourobservations assuming acetaldehyde formation in gas phase by the reaction ofethyl radical (CH$_3$CH$_2$) with atomic oxygen. Moreover, the chemicaldifferentiation between the two outflows suggests that the IRAS 4A1 outflow islikely younger than the IRAS 4A2 one. Further investigation is needed toconstrain the age of the outflow and observations of even younger shocks arenecessary and future spectroscopic studies on CH$_3$CH$_2$ are needed to beable to observe this species and provide strong constraints on the CH$_3$CHOformation.

Seeds of Life in Space (SOLIS). X. Interstellar Complex Organic Molecules in the NGC 1333 IRAS 4A outflows