The crystal and molecular structure of 2-chloro-1,8-phthaloylnaphthalene

Abstract

Crystals of 2-chloro-1,8-phthaloylnaphthalene are monoclinic, space group P2₁/c with four molecules of C₁₈H₉O₂Cl in a unit cell of dimensions a= 3·97, b= 29·83, c= 11·12 Å and β= 101·6°. The crystal structure was solved by Patterson, minimum function and Fourier methods, using 1217 three-dimensional independent reflexions. Refinement was by least-squares methods. The final discrepancy factor (R) is 0·097. The phthaloylnaphthalene system, which is folded about a line through the carbonyl carbon atoms, is distorted by the chlorine atom. The naphthalene plane makes an angle of 42° with that of the phthaloyl ring.