Cyclohexyne anthracene adduct

Cumulenes, generally regarded as difficult to prepare, can be obtained readily via rDA methods. Al-lenes, the most basic cumulenes, with a wide range of substituents on the allenic carlxm, can be obtained by FVP of anthracenic DA adducts as shown in equation (114). Butatriene (258), the next in the series of cumulenes, has been produced by FVP of a variety of adducts that includes 9,10-ethano-9,10-dihy-droanthracene, " cyclohexyne and fulvene, furan and benzene cycloadducts. Pentatetraene (260), a compound that is stable enough to be purified by GLC at room temperature, has also been obtained by the FVP of vinylallene (259). ... 

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