Process for the manufacture of stilbene compounds

Abstract

Abstract THE PRESENT INVENTION PROVIDES A PROCESS FOR THE MANUFACTURE OF STILBENE COMPOUNDS OF THE FORMULA 2,2''-DI(Y-),4,4''-DI(A-)STILBENE WHEREIN A STANDS FOR A BENZO (B)FURNAL-2-YL, NAPHTHO(1,2-B)FURAN-2-YL, NAPHTHOL(2,1-B)FURAN-2-YL, BENZO (B) THIOPHEN-2-YL, NAPHTHOL(2,1-B)THIOPNEH-2-YL, BENZOXAZOL2-7L, NAPHTHOXAZOL-2-YL, BENZOTRIAZOL-2-YL, NAPHTHOL(1,2-D) TRIAZOL-2-YL, BENZO(1,2-D:3,4-D'')BIS-TRAZOL-2-YL OR PHENETHINYL RADICAL, WHICH ITSELF CAN AGAIN BE SUBSTITUTED BY CHLORINE OR ALKYL, CYCLOHEXYL PHENYL-(1-4C)-ALKYL, PHENYL, METHYLENEDIOXY, PHENOXY OR ALKOXY GROUPS OR WHICH CAN CONTAIN A 6-MEMBERED CARBOCYCLIC RING WHICH IS FUSED TO IT AND WHEREIN Y STANDS FOR A HYDROGEN ATOM, CHLORINE OR THE N,N-DIMETHYLCARBAMYL RADICAL, CHARACTERISED IN THAT A COMPOUND OF THE FORMULA 1-CH3,2-Y,4-A-BENZENE WHEREIN A AND Y HAVE THE PREVIOUSLY INDICATED MEANING IS OXIDISED IN DIMETHYLFORMAMIDE, WHILST EXCLUDING AIR, IN THE PRESENCE OF A POTASSIUM COMPOUND OF THE FORMULA KOC(X-1)H(2X-1) WHEREIN X DENOTES AN INTEGER FROM 1 TO 6, WITH THE AZOBENZENE OF THE FORMULA ((Z1-PHENYL)-N=N-),Z2-BENZENE WHEREIN Z1 AND Z2 STAND FOR HYDROGEN OR CHLORINE; THE PRESENT INVENTION FURTHER PROVIDES NEW STILBENE DERIVATIVE WHICH CAN BE MANUFACTURE ACCORDING TO THIS PROCESS AND WHICH CAN BE USED AS OPTICAL BRIGHTENERS.

Inventors

• 👤 A Siegrist

Bibliographic Details