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1. Consult your lecture or lab text and give a complete structuer for the 'intermediate borate ester' formed in the reduction of 2-butanone with NaBH4. Why is it necessary to add water after the reaction is complete?

2. Give a mechanism for the reduction of the ketone, which involves the intermediacy of a borate ester [hint: revisit the mechanism for hydroboration of a alkenes with borane

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