When camphor undergoes nucleophilic attack by CH3CH2MgBr, the major product is the one in which the Grignard reagent has added endo. Explain the stereoselectivity observed. Which face of the carbonyl carbon, re or si, was attacked? 
Definitions:
Mutuality of Benefit
The principle that both parties involved in a contract or agreement must stand to gain from the arrangement for it to be valid and enforceable.
Promissory Estoppel
A legal principle that prevents a person from going back on a promise, even if it was not a formal contract, when the other party has relied on that promise to their detriment.
Legal Detriment
A loss or disadvantage that occurs to one party in a contract, considered a necessary component for a valid contractual agreement.
UCC
Uniform Commercial Code, a comprehensive set of laws governing all commercial transactions in the United States.
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