Figure 8
Solvent dependence of the polymorphism of (2) as revealed by X-ray powder patterns: (a) (2a) crystallized from dibutyl ether, (b) (2b) crystallized from diethyl ether, (c) (2b) crystallized together with (2a) from diisopropyl ether, (d) (2b) obtained from benzene and (e) (2b) obtained from a 1:1:1 mixture of diethyl ether, butan-2-one and dibutyl ether. |