9-Hydroxy-9-(3-methylbut-3-en-1-ynyl)-9H-fluorene-1-carbonitrile

The N atom in the title compound, C₁₉H₁₃NO, lies -0.0365 (14) Å from the plane formed by the fluorene system and the C[triple bond]N distance is 1.143 (2) Å. The C[triple bond]C distance is 1.191 (2) Å, and the ethynyl group deviates slightly from linearity with C-C[triple bond]C-C bond angles of 172.0 (1) and 176.1 (2)°. Terminal CH₂ and CH₃ groups are 50:50 disordered, with equal C-C distances of 1.408 (3) and 1.406 (3) Å.

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