厦门大学化学化工学院：《有机化学》课程教学资源（课件讲稿，双语版）Chapter 7 Alkenes and Alkynes I（7.4-7.10）Synthesis of Alkynes by Elimination Reactions

ORGANIC CHEMISTRY Chapter 7 7. 4 Cycloalkenes Department of Chemistry, Xiamen University

ORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 7 7.4 Cycloalkenes

ORGANIC CHEMISTRY Chapter 7 o The rings of cycloalkenes containing five carbon atoms or fewer exist only in the cis form H H H H H Cyclopropene Cyclobutene Cyclopentene Cyclohexene Department of Chemistry, Xiamen University

ORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 7 The rings of cycloalkenes containing five carbon atoms or fewer exist only in the cis form. H H H H H H H H Cyclopropene Cyclobutene Cyclopentene Cyclohexene

ORGANIC CHEMISTRY Chapter 7 7.5 Synthesis of Alkenes via Elimination reactions Department of Chemistry, Xiamen University

ORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 7 7.5 Synthesis of Alkenes via Elimination Reactions

ORGANIC CHEMISTRY Chapter 7 Dehydrohalogenation of Alkyl halides H H H H base C-C H HX H H H Dehydration of Alcohols H H HH heat H H HH HOH OH H H Debromination of vic-Dibromides Br H Zn chr coh H NbR Br H H Department of Chemistry, Xiamen University

ORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 7 C C H H H H X H base HX C C H H H H Dehydrohalogenation of Alkyl Halides C C H H H H C C H H H H OH H H , heat HOH Dehydration of Alcohols C C H H H H Zn,CH3CO2H ZnBr2 C C H H H H Br Br Debromination of vic-Dibromides

ORGANIC CHEMISTRY Chapter 7 7.6 Dehydrohalogenation of Alkyl Halides Department of Chemistry, Xiamen University

ORGANIC CHEMISTRY Department of Chemistry, Xiamen University Chapter 7 7.6 Dehydrohalogenation of Alkyl Halides