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The synthesis of costenal (dec-9-enal) was achieved by oxidative dehydrogenation of rosalva (dec-9-en-1-ol) on silicon carbide supported silver catalysts (4.5% Ag/SiC) at 450 o C in a flow reactor. The substrate was vapourized in a stream of oxygen diluted with 25 volumes of nitrogen (flow rate 140-650 l h -1 ). The optimum oxygen to substrate ratio was ca. 1.5. The highest costenal yield (51%) was obtained at 70% conversion as the contact time of the gas flow with the catalyst was the shortest (0.028 s). The activity was stable for a period of 96 h on stream.