Intramolecular Photocycloaddition Reactions of 3-(2-Propenoxy)cyclopent-2-en-1-ones and 3-(2-Propenoxy)cyclohex-2-en-1-ones

Article abstract of DOI:10.1021/jo00043a019

The 3-oxy-1,5-hexadienones 4a, 4b, 5a, and 5b undergo intramolecular <2+2> photocycloaddition reactions with quantum yields ranging from 0.2 to 0.002.In general, oxa substitution decreases the quantum yields and favors the formation of crossed closure pro