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The three acyclic isomers of benzene – 2,3‐hexadien‐5‐yne, 3‐methyl‐1,2‐pentadien‐4‐yne, and 1,2,3,4‐hexatetraene – have been prepared by simple routes from readily available starting materials. The hydrocarbons as well as several side products formed during their synthesis were characterized by their spectroscopic data and typical cycloaddition and isomerization reactions. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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Maurer et al. (2005) studied this question.
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