Non-uniformly substituted compounds of this type can be made by reacting titanium trichloride with two or more phthalonitriles, one of which is a fluorophthalonitrile as illustrated above, and the other or others of which are of the formula ##STR2## wherein R can be hydrogen, a halogen such as fluorine, chlorine or bromine, iodine or a hydrocarbon radical such as lower alkyl, e.g., methyl, ethyl,