Which of the following best explains the regioselectivity of cuprate and Grignard reactions with á,â-unsaturated carbonyls?
A) Grignards are more nucleophilic than cuprates and attack the most positive carbonyl carbon.
B) Grignards are less nucleophilic than cuprates and attack the most positive carbonyl carbon.
C) Grignards are more nucleophilic than cuprates and attack the most positive vinylic carbon.
D) Grignards are less nucleophilic than cuprates and attack the most positive vinylic carbon.
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