1,6 Methano(10)annulene

1,6-Methano[10]annulene , 1,6-methanonaphthalene or homonaphthalene is a hydrocarbon with chemical formula C₁₁H₁₂.

It is analogous to cyclodecapentaene ([10]annulene), but with two hydrogen atoms replaced by a transannular methylene bridge (-CH
2-). This compound is aromatic as judged from lack in bond length alternation by x-ray crystallography and a telltale diamagnetic ring current from NMR spectroscopy.

Its resonance energy is smaller than that of naphthalene.