Under similar reaction conditions, tert-butyl-, 4,5-dichloro- and 3,4,5,6-tetrachlorophthalimides gave the corresponding phthalocyanines in good to moderate yields. Crude metal-free phthalocyanines were purified as follows: For 3a, 3c, [15] and 3d [10] the reaction mixture obtained was dissolved in conc. H 2 SO 4 and the resulting solution was poured into cold water. The precipitates were collected, washed with water thoroughly, and further purified by soxhlet extractor with ...
