"Alkali metals in liquid ammonia in the presence of an alcohol reduce aromatic systems to 1,4-cyclohexadienes. These can be further elaborated into a host of derivatives. The availability of a wide variety of substituted aromatic compounds, either commercial or via synthesis, makes the Birch reduction an important tool in organic synthesis."
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George S. Zweifel and Michael H. Nantz, Modern Organic Synthesis (2006), Ch. 5 : Functional Group Transformations: The Chemistry of Carbon-Carbon π-Bonds and Related Reactions
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