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The title compound, C 22 H 16 N 2 , is the first example of an ynamine with H atoms bonded to the terminal C atoms. The environment around each N atom is almost planar. The distances of the N atoms from a least squares plane fitted through each N atom and the surrounding three C atoms, are 0.087 (3) and 0.041 (4) Å. The dihedral angles between these two planes and the central phenyl­ene ring are 23.34 (14) and 34.57 (14)°. The two acetyl­ene groups have an  anti  conformation, keeping a conjugation through the central benzene ring. The freely refined lengths of C  sp  —H are 1.00 (5) and 0.93 (4) Å, consistent with those of reported acetyl­enes. The H atoms bound to terminal C atoms have short contacts with the neighboring acetyl­enic C and N atoms. The closest contacts are an H⋯N distance of 2.67 (5) Å and an H⋯C distance of 2.74 (5) Å.

N1,N4-Diethynyl-N1,N4-diphenylbenzene-1,4-diamine

N¹,N⁴-Diethynyl-N¹,N⁴-diphenylbenzene-1,4-diamine