2H-Chromon

Bci der Umsetzung von 2-Acyl-x-alkyl-phetiolen mit Salpetersaure in Eisessig bei 100° erhalt man interessanterweise nach Cyclokondensation zum 2H-Chromon-Geriist durch Nitrierung die entsprechenden 3,8-Dinitro-2H-chromone ... [Pg.289]

Bei der analogen Nitrierung von 7-Hydroxy-4-methyl-2H-chromon erhalt man zu 73% 7-Hydroxy-4-methyl-3,6,8-trinitro-2H-chromon [Schmp. 216 217 (Aceton)]1 ... [Pg.289]

H-Chromone 3,8-Dinitro- E16d, 289 (Cyclokondensation/Nitrie-rung)... [Pg.24]

COOR + R-O-NO] 2H-Chromon 3-Amino-4-hydroxy-6-nitro- E19d, 689 (aus 1,3-Oxazol-Der.)... [Pg.574]

Benzoxazepin 2-Cyan-7-methoxy- E9d, 308 (2-CN — 6-OR —quinolin-1-oxid/hv) 2H-Chromon 4-Diazomethyl-7-methyl- E14b, 1025 (Sulfonylhy-drazon/Base)... [Pg.843]

Methoxy-4-methyl- -tetrafluoroborat E7a, 125 (aus 4-R —2H-chromon + R30 ) 4-Methoxy-2-methyl- -(2,4-dinitro-... [Pg.869]

Biphenyl 3,3 -Dinitro- X/3, 162 2H-Chromon 7-Acetoxy-4-diazomethyl- E14b, 1025 (Sulfonylhydrazon/Base)... [Pg.964]

Amino-3-nitro- XI/1, 932 4-Amino-4 -nitro- XI/1, 477 2H-Chromon 4-Diazomethyl-5,7-dimethyl- E14b, 1025 (Sulfonyl-hydrazon/Base)... [Pg.978]

Methoxy-phcnyl)-4-oxo-l-phenyl- 2047 2H-Chromone 5-tert.-Butyl-3-phenyl- 3039 Cyclopropene... [Pg.3354]

SCHEME 68 Synthesis of 2H-chromones by ar)me reaction with enals [94]. [Pg.68]

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