Photocycloaddition of Δα,β-γ-butyrolactone with olefins and its quenching by dimethoxyethylene

New Syntheses of Retinal and Its Acyclic

New Syntheses of Retinal and Its Acyclic Analog γ-Retinal by an Extended Aldol Reaction with a C6 Building Block That Incorporates a C5 Unit after Decarboxylation. A Formal Route to Lycopene and β-Carotene

✍ Alain Valla; Benoist Valla; Régis Le Guillou; Dominique Cartier; Laurent Dufossé 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 German ⚖ 112 KB 👁 1 views

Since the C 15 b-end-group aldehyde 10 ((b-ionylidene)acetaldehyde), an excellent intermediate in the syntheses of retinoids, can be synthesized in many ways from b-ionone, and since the corresponding acyclic C 15 y-end-group aldehyde 5 can easily be synthesized from citral (1) (Scheme 3), we applie