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A good-yielding, two-step synthesis of RuH2(CO)(PPh3)3 using conventional or microwave-assisted reflux techniques is described for use in undergraduate teaching 10 laboratories. RuH2(CO)(PPh3)3 is synthesised from RuCl3 . xH2O, PPh3 and KOH in ethanol in two steps under an inert atmosphere or using a one-pot microwave-assisted reflux to reduce the reaction time to approximately 10 minutes. This makes this useful compound readily available within an undergraduate laboratory session via efficient and sustainable syntheses, enabling learning outcomes associated with air sensitive 15 synthesis and application of group theory and spectroscopy to structure determination. GRAPHICAL ABSTRACT

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