Relative stabilities c CHCCH CH3CHCH3 CH3CH2CH2· ropyl radical P tert-Butyl radical Isopropyl radical 3° radical radica 2 radical Tertiary radical> Secondary radical>Primary radical Methyl radical 叔自由基 仲自由基 伯自由基 甲基自由基 radical)2° radical>1° radical>:C
Relative stabilities CH3 CH2 CH2 Propyl radical 1 o radical CH3 CHCH3 Isopropyl radical 2 o radical CHCCH3 CH3 tert-Butyl radical 3 o radical Tertiary radical 叔 自 由 基 Secondary radical 仲自由基 Primary radical 伯自由基 Methyl radical 甲基自由基 3 o radical 2 o radical 1 o radical CH3
7.3 The reactions of alkanes with halogens Methane, ethane, and other alkanes react with the first three members of the halogen family: fluorine, chlorine, and bromine, alkanes do not react appreciably with iodine. With methane the reaction produces a mixture of halomethanes and a hydrogen halide
7.3 The reactions of alkanes with halogens Methane, ethane, and other alkanes react with the first three members of the halogen family: fluorine, chlorine, and bromine. Alkanes do not react appreciably with iodine. With methane the reaction produces a mixture of halomethanes and a hydrogen halide
Ha| ogenation reactions(卤化反应) heat CH4 X2- CH3x CH2x2+ CHX3 CX4 HX or light XF, CI halomethane dihalomethane trihalomethane tetrahalomethane or br The reaction of an alkane with a halogen is called halogenation. In these reactions a halogen atom replaces one or more of the hydrogen atoms of the alkane. Reactions of this type, in which one atom or group replaces another. are called substituion reactions
Halogenation reactions (卤化反应） CH4 + X2 heat or light CH3X + CH2X2 + CHX3 + CX4 + HX X=F halomethane dihalomethane trihalomethane tetrahalomethane , Cl, or Br The reaction of an alkane with a halogen is called halogenation. In these reactions a halogen atom replaces one or more of the hydrogen atoms of the alkane. Reactions of this type, in which one atom or group replaces another, are called substituion reactions
7.3A Halogenation reactions (multiple substitution reactions) heat CH Cl CH3Cl t HCl or light Chloromethane(氯甲烷) CH3Cl Cl CHCh+ HCI DiChloromethane(二氯甲烷) CH2Cl2 Ch- CHCl3+ HCI Trichloromethane(三氯甲烷)(氯仿) CHCl3+Cl2—>CCl4+HCl Tetra chloromethane四氯化碳)
7.3A Halogenation reactions (multiple substitution reactions) CH4 + Cl 2 heat or light CH3Cl + HCl CH3Cl + Cl 2 CH2Cl 2 + HCl CH2Cl 2 + Cl 2 CHCl 3 + HCl CHCl 3 + Cl 2 CCl 4 + HCl Chloromethane (氯 甲 烷 ） DiChloromethane (二氯 甲 烷 ） TriChloromethane (三 氯 甲 烷 ） （ 氯 仿 ） TetraChloromethane (四 氯 化 碳 ）
heat CH3CH3 Cl CHrCHCI HCl or light Chloroethane(氯乙烷) CH3 CHCI2 HCI Cl2 1.1-Dichloroethane CH3 CH,CI CICH2CH2CI HCI 1.2-Dichloroethane
CH3 CH3 + Cl 2 heat or light CH3 CH2 Cl + HCl Chloroethane (氯 乙 烷 ） CH3 CH2 Cl Cl 2 CH3 CHCl 2 + HCl 1,1-Dichloroethane ClCH2 CH2 Cl + HCl 1,2-Dichloroethane