ChemInform Abstract: Intramolecular (2 + 2)Photocycloaddition. Part 7. Efficient Intramolecular (2 + 2)Photocycloaddition of Styrene Derivatives Toward New Crown Ethers.

ChemInform Abstract

4-Hydroxyacetophenone (I) is coupled with oligoethylene glycol bistosylates (II) to form the bridged bisacetophenones (III). These are converted to the bisvinyl compounds (IV) which cyclize under irradiation to give the macrocycles (V) and (VI). Further examples with different reaction conditions are given in the original paper. The compounds show high selectivity for lithium cations in solid-liquid extraction.