Thermal electrocyclization reactions II: benzooctatetraenes and benzodecapentaenes
摘要:
Thermal electrocyclization reactions of benzooctatetraenes and benzodecapentaenes substituted with R=H, Cl, and methyl were studied experimentally and computationally. Methyl and unsubstituted benzooctatetraenes and benzodecapentaenes give the [4.2.0]bicyclooctadiene products by 8 pi,6 pi-electrocyclization. Chlorine substitution led to thermal rearrangement of the initially formed 8 pi,6 pi-electrocyclization intermediates to give unprecedented products. (C) 2013 Elsevier Ltd. All rights reserved.