Die Cycloaddition von Äthoxyacetylen an Diphenylketen

The reaction between diphenylketene and ethoxyacetylene at −25° is shown to yield 1,1-diphenyl-2-ethoxy-cyclobut-2-en-4-one (I) and 1-ethoxy-3-oxo-3a-phenyl-3,3a-dihydroazulene (II). The modes of formation of I and II, their rearrangements to naphthalene derivatives are discussed and an unambiguous structural proof for II is given.

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