The intermediate product of 1,1-ditolyl-1-ethanol was synthesized by the reaction of p-tolylmagnesium bromide Grignard reagent with methylacetopbenone.Then,1,1-ditolylethylene was prepared by dehydration of 1,1-ditolyl-1-ethanol.The influence of dehydration temperature on yield as well as the stability of carbon cation which capped by 1,1-di-p-tolyletbene were investigated in this paper.The results showed that when dehydration temperature was below to 180℃,the yield increased with increasing temperature;however,when the dehydration temperature was higher than 180℃,the yield dropped.FT-IR and NMR demonstrated the structure of target product.The survival time of capped active species was obviously increased,and theses capped carbon cation could still initiate isobutylene cationic polymerization after stored 24 hour.%本文通过对甲基溴化镁格氏试剂与对甲基苯乙酮反应,制备出中间产物l,1-二(4-甲基苯基)乙醇；中间产物进一步脱水制备出目标产物1,1-二(4-甲基苯基)乙烯.考察了脱水温度对产率的影响；研究了1,1-二(4-甲基苯基)乙烯封端后碳正离子的稳定性.结果表明,脱水温度在180℃以下,产率随着温度的升高而增加；当脱水温度高于180℃时,产率下降；核磁、红外谱图证实了目标产物.聚异丁烯活性中心通过1,1-二(4-甲基苯基)乙烯封端后,碳正离子活性中心存活时间显著延长；24h后仍能继续引发异丁烯聚合.
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