Advanced Organic - Chemistry Practice Problems

The following thermal rearrangement is observed:

A triene system containing an all-trans hexatriene unit connected to a conjugated enone undergoes cyclization to form a bicyclic product with three new stereocenters, all cis to one another.

Proposed intermediate: An 8π electrocyclization followed by a 6π electrocyclization.

Task:

Before diving into specific problems, you must master the three pillars upon which all advanced organic chemistry rests. Every practice problem will test at least two of these simultaneously. advanced organic chemistry practice problems

Problem

Solution (concise)

Key concepts

Common pitfalls

Question:
You observe that Pd(OAc)₂ with a pyridine-sulfoximine ligand enables β-C(sp³)–H arylation of a ketone without any directing group. Propose a catalytic cycle and explain the role of the ligand in preventing ketone enolization.

Good feature: Modern method development—requires proposing a concerted metalation-deprotonation (CMD) transition state and ligand-enabled outer-sphere pathway.

The "synthesis problem" at the advanced level is presented backwards. Given a complex target (e.g., a polycyclic terpene), you must work backwards to commercially available starting materials. This tests your knowledge of named reactions (Diels-Alder, Michael addition, Claisen condensation) and protecting group strategy.

Target: (1R, 2S)-2-methylcyclohexanol (a single enantiomer) The following thermal rearrangement is observed: A triene

Starting materials: Cyclohexene, chiral auxiliaries (e.g., Evans oxazolidinone), and any inorganic reagents.

Tasks:

Week 1 — Mechanisms & arrow pushing fundamentals
Week 2 — Acid–base chemistry, pKa, and reactivity trends
Week 3 — Nucleophilic substitution & elimination (SN1, SN2, E1, E2) problems
Week 4 — Addition reactions to alkenes/alkynes & radical reactions
Week 5 — Conjugation, resonance, aromaticity, and electrophilic aromatic substitution
Week 6 — Enolate chemistry, enolates vs. enols, and carbonyl alpha-functionalization
Week 7 — Carbonyl reaction families: nucleophilic addition, acyl substitution, reductions, oxidations
Week 8 — Pericyclic reactions: cycloadditions, electrocyclizations, sigmatropic shifts (orbital symmetry, FMO)
Week 9 — Organometallic reagents & catalytic cycles (Pd, Ni, Cu, organoboranes, organolithium, Grignard)
Week 10 — Retrosynthesis: strategy and multi-step planning (protecting groups, chemoselectivity)
Week 11 — Spectroscopy & structure determination (1D/2D NMR, IR, MS, UV-Vis)
Week 12 — Mixed advanced problems, timed practice, and error analysis