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Catalytic Cycles: Hydroformylation and the Wacker Process

Inorganic Chemistry · Catalysis Catalytic Cycles: Hydroformylation and the Wacker Process Industrial catalysis assembled from four elementary steps that repeat in different orders. Learn the steps and any cycle becomes readable. BSc & MSc · Inorganic Chemistry · Concept The short answer: Homogeneous catalytic cycles are built from a small set of elementary organometallic steps: oxidative addition, migratory insertion, reductive elimination and ligand substitution. Hydroformylation and the Wacker process are the two standard examples, and each is examined by asking which step does what. The elementary steps Step What changes Oxidation state Electron count Oxidative addition A bond adds across…

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Metal Carbonyls: Synergic Bonding and What the Spectrum Reveals

Inorganic Chemistry · Organometallics Metal Carbonyls: Synergic Bonding and What the Spectrum Reveals The infrared stretching frequency of bound carbon monoxide is a direct readout of electron density at the metal, which makes it one of the most informative single measurements in the subject. BSc & MSc · Inorganic Chemistry · Concept The short answer: Carbon monoxide donates a lone pair to the metal and simultaneously accepts electron density from filled metal d orbitals into its own antibonding orbital. That back-donation weakens the C–O bond, lowering its stretching frequency — so the observed frequency measures how much back-donation is occurring….

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Cross-Coupling Reactions: Suzuki, Heck, Sonogashira and Stille

Organometallics · Entrance Exams Cross-Coupling Reactions: Suzuki, Heck, Sonogashira and Stille Four named couplings that share one palladium cycle — and differ only in what supplies the second carbon fragment. BSc & MSc · Organometallic Chemistry · Concept The short answer: All four couplings run on the same three-step palladium cycle. Oxidative addition and reductive elimination are common to every one of them; what distinguishes Suzuki, Sonogashira and Stille is only which organometallic delivers the partner group. The Heck is the exception — it has no transmetalation at all, and that single difference explains its different substrate scope and its…

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The 18-Electron Rule and Hapticity: Counting Without Errors

Inorganic Chemistry · Organometallics The 18-Electron Rule and Hapticity: Counting Without Errors Electron counting is one of the few entrance-exam skills that is purely mechanical. Getting it wrong is almost always a bookkeeping slip, not a gap in understanding. BSc & MSc · Inorganic Chemistry · Method The short answer: Count the metal d electrons and add the electrons donated by each ligand. Eighteen corresponds to a filled valence shell and is the stable configuration for most low-oxidation-state transition metal complexes. Two counting conventions exist — ionic and neutral — and they give the same total provided you do not…

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