1,4-Dihydronaphthalene is an aromatic hydrocarbon with the molecular formula C10H10. The compound is a derivative of naphthalene and differs from it by having one partially saturated ring. It can be synthesized by reduction of naphthalene with sodium in ethanol.
1,4-Dihydronaphthalene is unstable and can isomerize to 1,2-dihydronaphthalene in a solution of sodium ethoxide in ethanol:
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