Because of the biological activity of certain imidazolidinedio~ ies,~~~ we are synthesizing a number of such compounds incorporating variously substituted fluorene nuclei, connected through their 9 posit, ions (spirohydantoins), and through their 2 positions (4-fluorenyl-4- methylimidazolidinediones). This is part, of a pro-gram aimed at exploiting the fact that a number of fluorene compounds (particularly halogen-substituted derivatives) have shown ...
