How is (S)-3-Ethylmorpholine (CAS: 748117-01-3) typically synthesized?

(S)-3-Ethylmorpholine is typically synthesized via a hydrogenation process from N-ethylmorpholine using a hydrogenation catalyst such as palladium on carbon. The reaction is carried out under mild conditions and provides high selectivity and yield. The process is scalable and can be performed in a continuous flow reactor for industrial applications.