Electrophilic Addition of Alkenes

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CH 220 1st Edition Lecture 9 Outline of Current Lecture I. Electrophilic Addition of Alkenes II. Carbocation structure and stability III. Diverse reactions of Alkenes IV. Hydration of Alkenes V. Addition of Halogens to Alkenes Current Lecture I. Electrophilic Addition of Alkenes Markovnikov’s rule observed that if you add HX (being a hydrohalic acid) to an alkene, the H attaches to the carbon with the most Hs and X (the halogen) attached to the other end. This helps you to predict the outcome without drawing out the reaction mechanism. This rule, however, is only useful for reactions that go through a carbocation reaction + HBr On the structure of 2-pentene, above, it is evident that carbon 2 & 3 have the same amount of hydrogens, so we have to add the Bromine onto the 2nd and 3rd Carbon in two separate reactions, resulting in 2 different products being formed, 2-bromopentane and 3- bromopentane. When performing this reaction, you are equally likely to get either of the above products. Regiospecific reactions are unlike the previous reaction in that you can predict the product, which means that it would be a good reaction (monetarily speaking) because you would always get 100% product These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.

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