Even more reduction ( sodium borohydride ) and acylation resulted in epimeric di-acetate "'9 " '.
2.
Medeis is not correct that enantiomers convert between each other . " Within one enantiomeric form ", certain structural and epimeric forms interconvert.
3.
The use of 2-chloroacrylonitrile as dienophile is a viable synthetic equivalent for ketene, Hydrolysis of the epimeric mixture of chloronitrile adducts revealed the desired bicycloheptanone in high yield.
4.
Neosamine B ( L-neosamine B ) is most likely biosynthesized in the same manner as the neosamine C ( D-niosamine ) in neamine biosynthesis, but with an additional epimerization step required to account for the presence of the epimeric neosamine B in neomycin B.
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