A tandem silica-induced ring-opening and cyclisation of 1-aryl-1-chlorocyclopropanes leading to indenes
Abstract
Reaction of a number of methoxy-substituted 1-aryl-1-chloro-2-methylcyclopropanes with silica and carbon tetrachloride at 20 °C leads to indenes, in a process which may involve ring-opening to a diene with loss of HCl, followed by acid-induced cyclisation.