Synthesis of the first examples of 1,4-benzodioxocines
Abstract
Flash vacuum pyrolysis of the 1a,1b,6b,6c-tetrahydro-oxireno[2′,3′:3,4]cyclobuta[1,2-b][1]benzofurans (5), prepared from the benzoxepines (3)via two steps, results in ring-opening to give the novel 1,4-benzodioxocines (6), whose spectral data indicate that they are non-aromatic.
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