Hydroboration of Alkenes vs. Alkynes. Addition of an alkylboranes to a carbon- carbon double bond ("hydroboration") followed by oxidation is a common way to alcohols, for example, addition of dimethylborane to 2,3-dimethyl-2-butene yields 2,3-dimethyl-2-butanol. Me₂BH + Me₂C=CMe₂ →→→ Me₂CH-CMe₂OH The reaction is more general as borane also adds to carbon-carbon triple bonds. obtain structures and energies for reactants and transition states for addition of dimethylborane (Me₂BH) to both ethylene and acetylene. Which reaction has the lower activation energy? Offer an explanation for your result.

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Hydroboration of Alkenes vs. Alkynes. Addition of an alkylboranes to a carbon- carbon double
bond ("hydroboration") followed by oxidation is a common way to alcohols, for example,
addition of dimethylborane to 2,3-dimethyl-2-butene yields 2,3-dimethyl-2-butanol.
Me₂BH + Me₂C=CMe₂- →→ Me₂CH-CMe₂OH
The reaction is more general as borane also adds to carbon-carbon triple bonds. obtain structures
and energies for reactants and transition states for addition of dimethylborane (Me₂BH) to both
ethylene and acetylene. Which reaction has the lower activation energy? Offer an explanation for
your result.
Transcribed Image Text:Hydroboration of Alkenes vs. Alkynes. Addition of an alkylboranes to a carbon- carbon double bond ("hydroboration") followed by oxidation is a common way to alcohols, for example, addition of dimethylborane to 2,3-dimethyl-2-butene yields 2,3-dimethyl-2-butanol. Me₂BH + Me₂C=CMe₂- →→ Me₂CH-CMe₂OH The reaction is more general as borane also adds to carbon-carbon triple bonds. obtain structures and energies for reactants and transition states for addition of dimethylborane (Me₂BH) to both ethylene and acetylene. Which reaction has the lower activation energy? Offer an explanation for your result.
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