单词	cyclopentadiene
释义	cyclopentadiene /ˌsīkləˌpentəˈdīēn/ /ˌsiklə- / noun A colorless toxic liquid derived from the distillation of coal tar, insoluble in water, soluble in alcohol, and used in the manufacture of insecticides and resins.Sodium methylate and then cyclopentadiene are added, and ferrocene ultimately precipitates out of the solution.... The cyclopentadienes are prepared by reaction with hydrocarbylating agents or alcohols. Phenyl-substituted cyclopentadienes are proved to form phenylated pyrylium cations in the presence of silver perchlorate by insertion of an oxygen atom into the cyclopentadiene-ring.
随便看	residuous residuum resift resight re-sign resign resignal resignatary resignate resignation resignationism resignationist resigned resignedly resignedness resignee resigner resignful resignment resignor resile resilement resiliate resilience resiliency

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