Cp. Dell et al., ACETYLATION OF A HETEROCYCLIC ENAMINONITRILE - UNAMBIGUOUS STRUCTURALASSIGNMENT USING NMR METHODS, Journal of heterocyclic chemistry, 31(4), 1994, pp. 749-755
Using a combination of nmr techniques, the structure of the acetylatio
n product of methyl -9-methoxy-4H-5,6-dihydronaphtho[1,2-b]pyran-4-yl]
benzoate 2b has been shown to be the N-acetyl derivative 5a, rather t
han the rearranged 2-acetoxydihydropyridine 6a.