A remarkably bent allene. X‐Ray crystal structure and ab initio calculations

X‐ray data on the crystal and molecular structure of bis(biphenyl‐2,2′‐diyl)allene, reveal a remarkably strong deviation from linearity (170·1°) of the allene unit of the molecule. Ab initio calculations involving dimers of molecules yield good correlation with this geometry, showing that the non‐linearity is due to packing effects in the crystal.