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5′-Epimeric 3′-deoxy-3′,4′-didehydronucleoside- 5′-C-phosphonates: Synthesis and structural assignment by NMR and X-ray analyses

Epimeric 5′-(RS) dialkyl 3′-deoxy-3′,4′-didehydro- 5′-C-phosphonates were prepared by nucleophilic addition of various dialkyl phosphites to 3′-deoxy-3′,4′-didehydronucleoside- 5′-aldehydes. Whereas direct NMR configuration assignment for the C5′ atom bea