VIb, this reaction was superior in the 7-trifluoromethoxy series. These results with VI and VI11 suggest a reduced nucleophilicity for the nitrogen functions in the trifluoromethylthio series, an observation qualitatively in accord with the behavior predicted by the substituent constants for the ORF and SRF group~.~ In view of these synthetic difficulties other 1, 4- benzodiazepines were prepared only in the 7-trifluoromethoxy series.