4-methyl-2,6-diphenylpyrylium perchlorate 、
2-methyl-6-methylthionaphth<1,2,3-c,d>indolium methylsulfate 在
sodium acetate 作用下,
以
乙腈 为溶剂,
反应 0.33h,
以57%的产率得到2,6-diphenyl-4-<2-methyl-2,6-dihydronaphth<1,2,3-c,d>indol-6-ylidene>methylpyrylium perchlorate