根据环戊二烯和环戊二烯基与氯化汞的反应原理[见Z.Naturforsch,116,420(1956).],华脱等(G.W.Watt,L.J.Boye)提出了用重量法测定环戊二烯和环戊二烯基的分析方法。将几个毫克的环戊二烯或环戊二烯基钾溶于无水甲醇,然后与过量的40%的氯化汞甲醇溶液和饱和的醋酸钠甲醇溶液相混,就有黄色沉淀迅速析出。这一沉淀物于16小时后完全凝结。将上层清液用水稀释, According to the reaction principle of cyclopentadienyl and cyclopentadienyl with mercuric chloride [see Z. Naturforsch, 116, 420 (1956).], GW Waatt, LJ Boye, Methods for the analysis of alkene and cyclopentadienyl groups. Several milligrams of cyclopentadienyl or cyclopentadienyl potassium are dissolved in anhydrous methanol and then mixed with an excess of 40% mercuric chloride methanol solution and saturated sodium acetate methanol solution to precipitate a yellow precipitate rapidly . This precipitate completely coagulated after 16 hours. The supernatant was diluted with water,