Which Combination of Reagents Is to Be Preferred for the Synthesis

question 92

Multiple Choice

Which combination of reagents is to be preferred for the synthesis of 2,4-dimethylhexane by the Corey-Posner,Whitesides-House procedure?

• A) Lithium diisobutylcuprate + sec-butyl bromide
• B) Lithium dimethylcuprate + 2-bromo-4-methylhexane
• C) Lithium dimethylcuprate + 4-bromo-2-methylhexane
• D) Lithium diisopropylcuprate + 1-bromo-2-methylbutane
• E) Lithium di(2-methylbutyl)cuprate + isopropyl bromide

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