Abstract
The reaction of Mannich bases derived from 2-naphthol with 4-(2-nitrovinyl)morpholine or N,N-di-methyl(2-nitrovinyl)amine in acetic anhydride gives 2-nitro-1H-benzo[f]chromenes. This reaction may be regarded formally as the addition of a push-pull olefin acting as a 1,2-ambiphile with naphthalenic o-quinone methide acting as a 1,4-ambiphilic reagent.
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