Diethyl cyclopropane-1, 1-dicarboxylate was synthesised using alumina coated with potassium fluoride as a strong base and quaternary ammonium salt as a phase transfer catalyst ( PTC). Based on the experimental results a catalytic mechamism was proposed. 本文报道了在固液相转移催化条件下,将氟化钾浸渍的氧化铝作为强碱,季铵盐作为相转移催化剂(PTC),合成环丙烷-1,1-二甲酸二乙酯,探讨了该反应的机理。