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. 2008 Dec 2;2009(1):21–31. 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