Details

Autor(en) / Beteiligte

• Hoffmann, Norbert

Titel

Photochemical Cycloaddition between Benzene Derivatives and Alkenes

Ist Teil von

• Synthesis (Stuttgart), 2004-03, Vol.2004 (4), p.481-495

Erscheinungsjahr

2004

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Abstract The photochemical cycloaddition of benzene derivatives with alkenes yield polycyclic compounds, which are of great interest in organic synthesis. Three modes are observed: [2+2] (ORTHO), [3+2] (META) and, less frequently, [4+2] (PARA) photocycloaddition. The [3+2] cycloaddition has preferentially been studied and its intramolecular version was frequently applied to the synthesis of natural products. The [2+2] photocycloaddition is observed when electron active subsituents are present on the reaction partners. This mode is often followed by photochemical or thermal rearrangements. Furthermore, the [2+2] mode occurs concomitantly with the [3+2] photocycloaddition and leads frequently to complex reaction mixtures. More recent investigations deal with this item and show how the reaction may be directed to the [2+2] mode. 1 Introduction 2 [3+2] Photocycloaddition 3 [2+2] Photocycloaddition 4 [4+2] Photocycloaddition 5 Other Related Photocycloaddtions with Benzene Derivatives 6 Concluding Remarks