Chemical Reaction Mechanisms & Catalysis

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Abstractions about how chemical reactions proceed and are catalyzed, including elementary radical steps such as hydrogen-atom abstraction, addition and substitution families like hydrofunctionalization and nucleophilic aromatic substitution, cooperative and enzyme catalysis with Michaelis-Menten kinetics, and ion recombination in plasmas.

15 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Carbonation (Chemistry) — This carbonate-system branch of chemical carbonation reacts CO2 with water or a basic partner to form carbonic acid, bicarbonate, or carbonate; medium controls the product and consequence.
• Conia–Ene Reaction — An intramolecular carbon–carbon bond-forming cyclization in which an enolizable carbonyl partner reacts with a tethered alkene or alkyne, thermally or through catalytic activation, to form a ring.
• Dunathan Stereoelectronic Hypothesis — PLP-dependent enzymes select the primary bond broken at a substrate's alpha carbon by holding that sigma bond approximately perpendicular to the PLP–external-aldimine plane, aligning it with the conjugated p orbitals that stabilize developing carbanionic character.
• Free-Radical Addition — An elementary chemical step in which a radical bonds to an unsaturated substrate and leaves radical character on the resulting adduct.
• Frustrated Lewis Pair — A Lewis acid and Lewis base prevented by steric or geometric incompatibility from forming their usual stable adduct, leaving complementary reactivity available to cooperatively activate substrates such as hydrogen.
• Hydrofunctionalization — A chemical addition family that places hydrogen and a distinct functional fragment across a carbon-containing unsaturated bond.
• Hydrogen-Atom Abstraction — An elementary chemical step in which an acceptor takes a hydrogen-atom equivalent from a donor bond, changing both bonds and donor-side radical character.
• Hydrogen-Bond-Donor Catalysis — A molecular catalytic mode in which a regenerating hydrogen-bond donor interacts consequentially with a reacting species, changing the accessibility or selectivity of a reaction pathway.
• Immobilized Enzyme — An immobilized enzyme remains catalytically active while spatially constrained by attachment, entrapment, or aggregation.
• Ion–Ion Mutual Neutralization in Plasma — Oppositely charged plasma ions react, neutralizing the original ion pair in the reviewed settings.
• Michaelis–Menten Kinetics — An initial-rate enzyme-kinetics regime in which a variable substrate drives a rectangular-hyperbolic rate toward a limiting value V, with Km marking the substrate concentration at half that limit.
• Molecular Activated Recombination in Plasma — Molecular reactions create a positive-ion sink in a plasma, through pathways distinct from direct electron–ion recombination.
• Nucleophilic Aromatic Substitution — Nucleophilic aromatic substitution replaces a group on an aromatic substrate with a nucleophile, including ipso and elimination–addition routes that can differ in bonding site.
• Schenck Ene Reaction — Oxyfunctionalize an alkene bearing an allylic hydrogen by reacting it with singlet molecular oxygen, transferring that hydrogen and transposing the double bond to produce an allylic hydroperoxide whose selectivity and downstream handling remain explicit.
• Semisynthesis — Build a target compound by chemically transforming a biologically supplied precursor that already carries part of its structure.