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The single crystal X-ray structures of 2-nitrophenylacetylene, 1, and 4,5-dimethyl-2-nitrophenylacetylene, 2, are presented. In both structures the nitro moiety is essentially coplanar with the benzene ring and interacts with the proximal alkyne which is slightly distorted. The crystal packing of both compounds is dominated by intramolecular alkyne-nitro C–H···O hydrogen bonds that are supplemented...
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