An alternative synthetic route to 3H-azepines: thermal isomerization of 2,4-and 3,5-di-t-butyl-3a,5a-dihydro-3H-cyclobuta[b]pyrroles
Abstract
Di-t-butyl derivatives of 3a,5a-dihydro-3H-cyclobuta[b]pyrroles, synthesized from photoisomers of 1H-azepine derivatives (Dewar azepines), isomerized thermally to 3H-azepines.