Chemistry 1027A/B Lecture : Reactions of Alkenes and Alkynes- Orgo.docx

• School: Western University
• Department: Chemistry
• Course: Chemistry 1027A/B
• Professor: Mel Usselman

Document Summary

Multiple bonds are strong and reactive: because pi bond will attract electron-seeking reagents, has electrons looking to do something else. Alkenes are stable but have electrons that are relatively unexposed. All alkenes are very stable molecules and very reactive. Characteristic reaction if all alkenes and alkynes is an addition reaction in which ab species reacts to break the pi bond and from two new sigma bonds. Electrophilic addition reactions: in an exothermic reaction there can be two possible products. Two structural isomers are possible as addition products: when an alkene reaction generates 2 constitutional isomers in the same reaction we say the reagent refers to both in certain regions. The constitutional isomers formed by reactions are referred to as regioisomers. When one regioisomer formed in larger amount reaction called regioselective: mechanism of electrophilic reaction. Two electrons of the pi bond attract the plus to it. The pi bond takes the positive a breaking bond between.