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. Author manuscript; available in PMC: 2010 Oct 28.
Published in final edited form as: European J Org Chem. 2009 Jan;2009(1):3–169. doi: 10.1002/ejoc.200800804

Scheme 5.

Scheme 5

Isomerization of the epimeric “primary” FCCs (pFCC and epi-pFCC) is catalysed stereoselectively by the propionic acid function and leads to “primary” NCCs (pNCC and epi-pNCC), as interpreted in terms of the suggested mechanism shown.[20,42]