2,4-diphenyl-5,6,7,8-tetrahydro-1-benzopyranium perchlorate 、
[(E)-3-Chloro-3-(4-dimethylamino-phenyl)-allylidene]-dimethyl-ammonium 以35%的产率得到8-[(E)-3-Chloro-3-(4-dimethylamino-phenyl)-prop-2-en-(E)-ylidene]-2,4-diphenyl-5,6,7,8-tetrahydro-chromenylium; perchlorate