Multiple Select QuestionSelect all that applySelect the statements that correctly describe the preparation of organoboranes used in the Suzuki reaction.Multiple select question.Hydroboration of an alkyne using catecholborane produces a vinylborane.Reaction of RLi with BH3 followed by NaOH produces an arylborane.Hydroboration of an alkene with BH3 followed by reaction with H2O2 and OH- gives a vinylborane.Reaction of RLi with trimethylborate is used to prepare an arylborane.
Question
Multiple Select QuestionSelect all that applySelect the statements that correctly describe the preparation of organoboranes used in the Suzuki reaction.Multiple select question.Hydroboration of an alkyne using catecholborane produces a vinylborane.Reaction of RLi with BH3 followed by NaOH produces an arylborane.Hydroboration of an alkene with BH3 followed by reaction with H2O2 and OH- gives a vinylborane.Reaction of RLi with trimethylborate is used to prepare an arylborane.
Solution
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"Hydroboration of an alkyne using catecholborane produces a vinylborane." - This statement is correct. Hydroboration of an alkyne using catecholborane does indeed produce a vinylborane, which can be used in the Suzuki reaction.
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"Reaction of RLi with BH3 followed by NaOH produces an arylborane." - This statement is incorrect. The reaction of RLi (an organolithium compound) with BH3 (borane) would produce an alkylborane, not an arylborane. Arylboranes are typically prepared from aryl halides, not alkyl lithium compounds.
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"Hydroboration of an alkene with BH3 followed by reaction with H2O2 and OH- gives a vinylborane." - This statement is correct. Hydroboration of an alkene with BH3, followed by oxidation with hydrogen peroxide and a hydroxide ion, does indeed produce a vinylborane.
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"Reaction of RLi with trimethylborate is used to prepare an arylborane." - This statement is incorrect. The reaction of RLi with trimethylborate would produce an alkylborane, not an arylborane. As mentioned above, arylboranes are typically prepared from aryl halides.
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