Convenient synthesis of phthalocyanines with disilazanes under mild conditions

We have previously reported convenient synthesis of metallo-and metal-free phthalocyanines under mild conditions by heating phthalimides, phthalic anhydrides, and phthalonitriles with hexamethyldisilazane. This paper deals with a convenient method for the preparation of Cu- and Zn-phthalocyanines as well as metal-free phthalocyanines by using disilazane derivatives with high boiling points.