Synthesis of 2-arylidenebenzocycloalkanones containing N -donor heterocyclic rings

A series of 2-arylidenebenzocycloalkanones containing heterocyclic rings 1 – 8 were prepared and characterized by IR, 1 H NMR and elemental analyses. X-ray diffraction study of 6 reveals that the cyclohexyl ring of the 3,4-dihydronaphthalen-1(2 H )-one adopts a chair conformation with a maximum deviation of 0.547(3) Å and makes dihedral angles of 52.24(17)° and 11.23(16)°, respectively, with the benzene plane and the mean plane of the benzimidazole ring.