Equations 5.25ac on p. 193 show the formation of trialkylboranes from alkenes and BH 3 . In

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Equations 5.25a–c on p. 193 show the formation of trialkylboranes from alkenes and BH3. In the reaction of 2,3-dimethyl-2-butene with BH3, only two equivalents of the alkene react, even with a large excess of alkene, to give a dialkylborane called disiamylborane.2 (CH3)2C=CHCH3 + BH3 2-methyl-2-butene "disiamylborane" (a dialkylborane)

Give the structure of disiamylborane, and suggest a reason that only two equivalents of alkene react.

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Organic Chemistry

ISBN: 9781936221349

6th Edition

Authors: Marc Loudon, Jim Parise

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