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The notion that this reaction is anti-Markovnikov is a little silly. Because
Markovnikov's rule is taught in the undergraduate context of hydrating alcohols, you end up with the assumption that it refers to where the hydroxyl ends up. This isn't the case, as is obvious from the actual statement of
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Your concern sounds more general than this particular reaction (or at least if the rule itself is redescribed, other reactions' articles that also behave the same as hydroboration–oxidation may have to be altered). So let's keep the discussion on the central point, at
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the rule: it's a question of where the cation ends up, and that's at the more stabilized location. In hydroboration, the cation ends up at the more stabilized location; unlike in straight-up hydration or in oxymercuration-demercuration, the first reagent to add
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The mechanisms part mentions that; I don't see a separate section on borane reagents - at least as the article is now. Good idea to include it if there is, though.
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I'm thinking of adding to the "Isolation of Borane
Reagents" section that BH3 is commercially available as a THF or Diethylether solution. Any objections? --
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The hydrogen, since it is hydridic, should have the negativ partial charge. But it is on the boron atom. Must be corrected!
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Knowledge (XXG). If you would like to participate, please visit the project page, where you can join
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Talk:Markovnikov's rule#Claim that hydroboration-oxidation is anti-Markovnikov
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I think this bears clarification both here and at
Markovnikov's rule.
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Claim that hydroboration-oxidation is anti-Markovnikov
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