A novel rearrangement of cyclobutanes to cyclopropanes; construction of tricyclo[5.4.0.0]undecane and bicyclo[4.1.0]heptane systems
Abstract
Treatment of hydroxylated cyclobutane derivatives with BF3·OEt2, POCl3 in the presence of pyridine or Raney nickel causes a novel rearrangement forming tricycle[5.4.0.0]undecane and bicyclo[4.1.0]heptane systems.