Advanced Organic Chemistry Practice Problems Page

: The system favors the branched aldehyde over the linear alternative due to the stability of the intermediate benzyl-rhodium complex.

: The enolate equilibrates to favor the more stable, more highly substituted double bond. advanced organic chemistry practice problems

: Reacting one functional group over another (e.g., reducing a ketone in the presence of an ester). : The system favors the branched aldehyde over

Design a stereoselective synthesis for the target molecule (2R,3S)-3-methylpentan-2-ol starting only from propene ( ) and any necessary inorganic reagents. Solution & Retrosynthetic Blueprint: Design a stereoselective synthesis for the target molecule

Predict the major diastereomer formed in the following nucleophilic addition:

-participation due to poor orbital alignment. It undergoes standard, slower ionization.

Predict the major stereoisomer formed in the reduction of (S)-2-phenylpropanal using LiAlH4. Draw the Cram, Felkin-Anh, and Polar Felkin-Anh transition states. Explain why the Felkin-Anh model is generally preferred for predicting the diastereoselectivity in this nucleophilic addition.