methyl (9Z)-9-(3-ethoxy-1,2,2-trimethyl-5-phenyl-3H-pyrrol-1-ium-4-ylidene)fluorene-2-carboxylate;trifluoromethanesulfonate 以
乙腈 为溶剂,
反应 6.0h,
以43%的产率得到methyl (9E)-9-(3-ethoxy-1,2,2-trimethyl-5-phenyl-3H-pyrrol-1-ium-4-ylidene)fluorene-2-carboxylate;trifluoromethanesulfonate