Redox-photosensitized reactions. 5. Redox-photosensitized ring cleavage of 1,1a,2,2a-tetrahydro-7H-cyclobut[a]indene derivatives: mechanism and structure-reactivity relationship
Redox-photosensitized reactions. 5. Redox-photosensitized ring cleavage of 1,1a,2,2a-tetrahydro-7H-cyclobut[a]indene derivatives: mechanism and structure-reactivity relationship
Intermolecular [2+2] Photocycloaddition of β-Nitrostyrenes to Olefins upon Irradiation with Visible Light
作者:Lisa-Marie Mohr、Thorsten Bach
DOI:10.1055/s-0036-1588524
日期:2017.12
The title compounds were found to undergo a [2+2] photocycloaddition with olefins at λ = 419 nm in CH 2 Cl 2 as the solvent. The resulting cyclobutanes were isolated in yields of 32–87% (11 examples) and showed a defined relative configuration at C1/C4 in the major diastereoisomer (nitro and aryl trans ). The analysis of side products and triplet sensitization experiments support a mechanistic scenario