2-dicyanomethylene-1,3-indandione oxide 、
4-[N,N-bis(2-tetrahydro-2H-pyran-2-yloxyethyl)amino]-1-(3,5-diphenylpyridin-4-ylazo)benzene 以
乙腈 为溶剂,
以43%的产率得到2-[4-N,N-bis(2-tetrahydro-2H-pyran-2-yloxyethyl)aminophenylazo-3,5-diphenylpyridinium-1-yl]-1,3-dioxo-2,3-dihydro-1H-inden-2-ide