1439-43-6 4'-Nitro-2-(triphenylphosphoranylidene)acetophenone ACETOPHENONE, 4'-NITRO-2-(TRIPHENYLPHOSPHORANYLIDENE)- BRN 0574475 Ethanone, 1-(4-nitrophenyl)-2-(triphenylphosphoranylidene)- (9CI) p-Nitroacetophenylenetriphenylphosphine