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14 August, 19:27

In the first step of hydroboration mechanism, why is an arrow drawn from the pi bond of the alkene to the B atom of the borane reagent signifying the pi electrons are used to make a new C-B bond? See the background information presented with Part I.

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  1. 14 August, 19:49
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    The borane reagent acts as a Lewis acid because it is electron-deficient.

    Explanation:

    The borane reagent is electron-deficient because it does not have a complete octet. Thus, it is electrophilic and accepts donation of the electrons from the alkene.
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