Difference between Ephedrine and Psudoephedrine?

[Rhodium]

Zur Synthese des Pseudo-Ephedrins
Ernst Späth

Chem. Ber. 58, 197-199 (1925)

(https://www.thevespiary.org/rhodium/Rhodium/pdf/pseudoephedrine.spath-1925.pdf)

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Synthesis of Ephedrine from Propionic Acid
I. Kh. Fel'dman, N. N. Bel'tsova, and A. A. Ginesina

J. Appl. Chem. USSR (Engl.Transl.) 35, 1309-1311 (1962)

(https://www.thevespiary.org/rhodium/Rhodium/chemistry/propionic2ephedrone2ephedrine.html)

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Synthesis of Ephedrine and Similar Compounds. I. A New Synthesis of Ephedrine
Richard H. V. Manske & Treat B. Johnson

J. Am. Chem. Soc. 51, 580-582 (1929)

(https://www.thevespiary.org/rhodium/Rhodium/chemistry/ephedrine.manske.html)

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[Rhodium]

Ueber das 'Pseudo-Ephedrin'
A. Ladenburg & C. Oelschlägel

Ber. 22, 1823-1827 (1889)

(https://www.thevespiary.org/rhodium/Rhodium/pdf/pseudoephedrine-1889.pdf)
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Ueber das Ephedrin und das Pseudoephedrin
P. Rabe

Ber. 44, 824-827 (1911)

(https://www.thevespiary.org/rhodium/Rhodium/pdf/ephedrine.rabe-1911.pdf)