Spirobinaphthopyrans: Synthesis, x-ray c
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Linda Lončar-Tomašković; Klaus Lorenz; Antonija Hergold-Brundić; Draginja Mrvoš-
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Article
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1999
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John Wiley and Sons
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English
⚖ 263 KB
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Chiral spirobinaphtopyrans 1-9 were synthesised using the acid catalyzed aldol condensation of 2-hydroxy-1-naphthaldehyde or 1-hydroxy-2-naphthaldehyde with the appropriate ketone and subsequent reaction of the isolated pyrylium salt with base. Separation or enrichment of enantiomers was accomplishe