CHEM 2100 Chapter Notes - Chapter 9: Fischer Projection, Hydroboration, Electrophile

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12 Sep 2017
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Double bond is going to go away because you are adding atoms. Each sp2 atom gets a new bond --> becomes sp3. A pie bond can act as a nucleophile or as a bronsted-lowry base. Consider both enthalpy and entropy: dg = (dh) + (-tds) Heat is released into the surroundingns dh = 166 - 185 dh = -19 = exothermic. -> you call tell because you start with two molecules and turn them into one. Typical addition reactions have (-)dh where dssurr = (+) and dssys = (-) So (-)tdssys is positive, favors elimination dg = dh + (-tds) where dh = (-) & -tds = (+) One carbon gets a hydrogen, the other gets a halogen. Doesnt matter because you are dealing with a symmetrical alkene. Markovikov"s rule: h atoms tend to add the carbon already bearing more h atoms. H on one carbon, (+) on the other. No preference as to which side is attacked.