Advanced Organic Chemistry Practice Problems -

This rotation brings both methyl groups to the same side of the newly formed ring. : cis-5,6-dimethylcyclohexa-1,3-diene . Problem 2: Regioselective Enolate Chemistry

Under thermal activation, electrons occupy the ground state molecular orbitals. For ethylene, the Highest Occupied Molecular Orbital (HOMO) is Ψ1cap psi sub 1

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), the orbitals match symmetry perfectly. Suprafacial overlap proceeds smoothly, allowing the rapid formation of cyclobutane under UV light. Summary Reference Table for Key Transformations Reaction Name Key Reactive Intermediate Primary Synthetic Utility Carbocation / Oxocarbocation Converts 1,2-diols into branched ketones. Robinson Annulation Enolate / Michael Acceptor Synthesizes substituted cyclohexenones. Diels-Alder Reaction Concerted Transition State Forms six-membered rings with precise stereocontrol. Wittig Reaction Oxaphosphaetane Converts aldehydes/ketones into alkenes regio-specifically.

Design a synthesis of the following spirocyclic compound starting from cyclohexanone and any acyclic reagents (≤ 5 carbons). This rotation brings both methyl groups to the

: Light cleaves the weak N-Br bond in NBS to generate a bromine radical.

Using the Robinson annulation, show how you would make the Wieland–Miescher ketone from 2-methyl-1,3-cyclohexanedione and methyl vinyl ketone. For ethylene, the Highest Occupied Molecular Orbital (HOMO)

) equal a net of configuration at the reacting center. High-Utility Strategies for Exam Day

) to the carbonyl oxygen to minimize steric and electronic interactions.

For multi-step synthesis, work backward from the target molecule (TM):

Translate target fragments into real, reactive reagents.