摘要:
A new process for the manufacture of pyranthrones (I) from 2,2'' -dialkyl-1,1''-dianthraquinonyls (II) by heating (II) at from 150* to 210* C. in polar organic solvents in the presence of alkali metal acetates.
摘要:
A process for the production of pyranthrones or flavanthrones which comprises reacting substituted or unsubstituted 2,2'-dialkyl-1,1'-dianthraquinonyls or 2,2'-diacylamino-1,1'-dianthraquinonyls respectively in a two-phase system of aqueous organic solvents using quaternary ammonium or phosphonium compounds as catalysts.
摘要:
6,14 - DICHLOROPROPYRANTHRONE AND A PROCESS FOR ITS MANUFACTURE FROM 3,3''-DICHLORO-2,2''-DIMETHYL-1,1''-DIANTHRAQUINOYL. 6,14-DICHLOROPYRANTHRONE IS A PIGMENT DYE HAVING EXCELLENT COLORISTIC PROPERTIES.