Journal of Organic Chemistry p. 3069 - 3072 (1989)
Update date:2022-08-02
Topics:
Armesto, Diego
Horspool, William M.
Martin, Nazario
Ramos, Ana
Seoane, Carlos
4-Substituted 2-amino-3,5-dicyano-6-phenyl-4H-pyrans undergo a novel photochemical ring contraction to cyclobutenes from the triplet state.For example, irradiation of a solution of 2-amino-3,5-dicyano-6-phenyl-4H-pyran-4-spirocyclopentane (9a) in methylen
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