Novel 5-aryl-1H-1,4-benzodiazepine-2(3H)-one-3-phosphonic acids and their lower alkyl and phenyl(lower)alkyl esters which are CNS depressants, and processes for their use in preparing other 3-substituted benzodiazepines.
5-Aryl-1H-1,4-benzodiazepine-2(3H)-one-3-phosphonic acids, derivatives and processes for their use