Preparation of Alkyl Halides Numerous ways to make alkyl halides (la)Free Radical Halogenation Usually this method gives mixtures of mono-,di-,tri-etc halogenated compounds,which is considered an inefficient method for the synthesis of a desired compound. Consider propane: 入+ch2hvCH-Ct-C比Cl+_CHgCHCL-CHa CH3-CH2-CHCl2 +CH3-CCl2-CH3 and others Sometimes if there can be control over the selectivity of halogenation this is a useful route. 以 Cl hv Chlorocyclohexane (50%) CH3 CH3 H3C- H +Br2 hv H3C Br CH3 CH3 t-Butylbromide (90%) Ch06 Alkyl Halides (landscape) Page 4 Ch06 Alkyl Halides (landscape) Page 4 Preparation of Alkyl Halides Numerous ways to make alkyl halides. (1a) Free Radical Halogenation Usually this method gives mixtures of mono-, di-, tri- etc halogenated compounds, which is considered an inefficient method for the synthesis of a desired compound. Consider propane: Sometimes if there can be control over the selectivity of halogenation this is a useful route. + Cl2 h CH3 -CH2 -CH2Cl + CH3 -CHCl-CH3 CH3 -CH2 -CHCl2 +CH3 -CCl2 -CH3 and others H Cl + Cl2 h Chlorocyclohexane (50%) H H CH3 H3C CH3 H + Br2 h CH3 H3C CH3 Br t-Butylbromide (90%)