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Polyyne
Any organic compound with alternating C–C and C≡C bonds / From Wikipedia, the free encyclopedia
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A polyyne is any organic compound with alternating single and triple bonds; that is, a series of consecutive alkynes, (−C≡C−)n with n greater than 1. These compounds are also called polyacetylenes, especially in the natural products and chemical ecology literature,[1] even though this nomenclature more properly refers to acetylene polymers composed of alternating single and double bonds (−CR=CR′−)n with n greater than 1. They are also sometimes referred to as oligoynes,[2][needs IPA] or carbinoids after "carbyne" (−C≡C−)∞, the hypothetical allotrope of carbon that would be the ultimate member of the series.[3][4] The synthesis of this substance has been claimed several times since the 1960s, but those reports have been disputed.[5] Indeed, the substances identified as short chains of "carbyne" in many early organic synthesis attempts[6] would be called polyynes today.
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The simplest polyyne is diacetylene or butadiyne, H−C≡C−C≡C−H. Along with cumulenes, polyynes are distinguished from other organic chains by their rigidity and high conductivity,[7] both of which make them promising as wires in molecular nanotechnology. Polyynes have been detected in interstellar molecular clouds where hydrogen is scarce.[citation needed]