Therapeutically active compounds utilizable as ataractic agents and as sedatives and hypotensive agents having the formula WHEREIN R, R1 and R2 are hydrogen, lower alkyl, phenyl or phenyl-lower alkyl; R3 and R4 are hydrogen, halogen, lower alkyl, trifluoromethyl, or lower alkoxy; X is oxygen or sulfur, r is 2 to 5; m is 0 or 1; n and p are each 0, 1 or 2; provided that the sum of m + n + p being from 1 to 3, and that when m equals 1 and n and p are each O, X is sulfur.
DIBENZOOXAZEPINES AND DIBENZOTHIAZEPINES