Organic chemistry demands mastery of electron movement, reaction mechanisms, stereochemistry, and structure determination — all with exacting attention to arrow-pushing conventions and three-dimensional structure. Our organic chemists deliver assignments with correct curved arrows, full stereochemical analysis, and logical multi-step synthesis routes.
| Reaction Types & Mechanisms | Structure & Stereochemistry | Spectroscopy & Analysis |
|---|---|---|
| Nucleophilic substitution (SN1, SN2) | Stereoisomers (enantiomers, diastereomers) | ¹H and ¹³C NMR interpretation |
| Elimination reactions (E1, E2, E1cb) | R/S configuration (CIP rules) | Infrared (IR) spectroscopy |
| Electrophilic aromatic substitution (EAS) | Optical activity and specific rotation | Mass spectrometry (MS, fragmentation) |
| Nucleophilic aromatic substitution (NAS) | Conformational analysis (Newman projections) | UV-Vis spectroscopy |
| Addition reactions (electrophilic, nucleophilic, radical) | Ring strain and chair conformations | Structure elucidation from spectra |
| Carbonyl chemistry (aldehydes, ketones, esters, amides) | Meso compounds and Fischer projections | Retrosynthetic analysis |
| Named reactions (Diels-Alder, Grignard, Wittig, aldol, etc.) | Aromaticity (Hückel's rule, anti-aromatic) | Multi-step synthesis design |
Every curved arrow in an organic mechanism must start at an electron source (lone pair or pi bond) and point to where those electrons go (bond formation site or atom that becomes electron-rich). Arrows starting from a positive charge, pointing the wrong direction, or missing entirely are the most common mark-losing errors in mechanism questions. Each mechanistic step must be individually drawn and justified.
Substitution and addition reactions have specific stereochemical outcomes: SN2 gives inversion at the stereogenic centre (Walden inversion); E2 requires anti-periplanar geometry (affects which alkene isomer forms); Diels-Alder is a syn addition (endo/exo products). Ignoring stereochemical outcomes and drawing a flat structural formula loses marks in any question involving a chiral centre or pi face selectivity.
Multi-step synthesis questions are marked on every step — not just the final product. Each step requires the correct reagent(s), reaction conditions (solvent, temperature, catalyst), and the expected product drawn correctly, including stereochemistry. A correct final product via an impossible reaction sequence earns few marks.
In retrosynthesis, always identify the key bond disconnection first by looking at the target molecule's functional groups and carbon skeleton. Work backwards from the target: what functional group transformation created the last bond? What starting material would give the direct precursor? One logical disconnection per step — retrosynthesis is not a list of reactions but a systematic backwards logical argument through bond-forming steps.
Reaction mechanisms, synthesis design, stereochemistry, NMR/IR/MS interpretation, and retrosynthesis — full curved-arrow mechanisms with correct stereochemical outcomes.
Yes. Structural drawings and curved-arrow mechanisms are delivered in ChemDraw (.cdx), Marvin (.mrv), or as high-resolution images (PNG/PDF/SVG) suitable for direct submission. We use correct bond angle conventions, proper stereochemistry wedges and dashes, and standard curved arrow notation throughout.
Yes. ¹H NMR structure elucidation (chemical shifts, integration, multiplicity, coupling constants), ¹³C NMR, DEPT, COSY, HSQC, and HMBC 2D NMR interpretation, and combined spectral analysis (IR + MS + NMR) for structure determination are all handled. We identify each signal and connect it to a specific atom or group in the structure, as required by the assignment.
Yes. Grignard reaction, Wittig olefination, Diels-Alder cycloaddition, aldol condensation, Michael addition, Claisen condensation, Beckmann rearrangement, Baeyer-Villiger oxidation, and all other standard named reactions are covered with full stepwise curved-arrow mechanisms, not just reactants and products.