Aminonaphthacene derivatives and their production

Abstract From the Canadian patent

Aminonaphthacene derivatives of the formula: (I), wherein R1 is a hydrogen atom, a hydroxyl group or a lower alkoxy group, R is a hydrogen atom or a hydroxyl group R3 and R4 are each a lower alkoxy group or when taken, together, represent an ethylenedioxy group or an oxo group and R5 and R6 are each a hydrogen atom, a lower alkyl group or a group of the formula: -A-Q (A) (in which A is an alkylene group optionally bearing at least one lower alkyl and Q is a hydrogen atom, a hydroxyl group, a lower alkoxy group or a group of the formula: , (B) wherein R7 and R8 are each a hydrogen atom, a lower alkyl group a benzyl group, a, hydroxy(lower)alkyl group or an amino(lower)alkyl group or when …