3‐Amino‐4′‐methyl­‐5‐ethylbi­phenyl‐2,4‐dicarbo­nitrile and 3‐amino‐4′‐(N,N‐diethyl­amino)‐5‐ethyl­bi­phenyl‐2,4‐dicarbo­nitrile

In the title compounds, C₁₇H₁₅N₃ and C₂₀H₂₂N₄, the methyl derivative crystallizes with two mol­ecules in the asymmetric unit, while the N,N‐diethyl­amino derivative crystallizes with one mol­ecule per asymmetric unit. The bi­phenyl twist angle for both mol­ecular structures is approximately 45°. The molecular packing is stabilized by N—H?N hydrogen bonds.