Physical organic chemistry

Physical organic chemistry studies how molecular structure, energy, and reaction mechanisms govern the behavior and reactivity of organic molecules.

Transition state: A high-energy configuration along a reaction pathway at the top of its activation-energy barrier. Its structure connects molecular geometry to the rate and selectivity of an organic reaction.
Molecular orbital theory: A model describing electrons as occupying orbitals that extend over one or more atoms. Orbital interactions explain why molecular geometry and substituents change reaction pathways.
Linear free-energy relationship: An empirical linear correlation between changes in free energy and a measurable chemical property. It provides a framework for interpreting substituent trends beyond the specific Hammett equation.
Louis Plack Hammett: An American chemist who developed quantitative relationships between substituent effects and chemical reactivity. His substituent constants and equation became central tools for correlating structure with reaction behavior.
Organic chemistry: The study of the structure, properties, reactions, and synthesis of carbon-containing compounds. Physical organic chemistry focuses on explaining reactivity within this broader discipline.
Reaction coordinate: A parameter that tracks progress along a chemical reaction pathway. Reaction-coordinate diagrams map the energy changes physical organic chemists use to compare pathways.
Resonance (chemistry): A representation of electron delocalization using multiple contributing Lewis structures. Resonance explains how charge distribution and conjugation influence organic reactivity.
Brønsted catalysis law: A relationship between catalyst strength and reaction rate for a series of related acids or bases. It helps assess how much proton transfer occurs in a rate-controlling transition state.
Christopher Kelk Ingold: A British chemist who helped establish modern theories of organic reaction mechanisms. His work clarified how electronic effects and mechanisms such as SN1 and SN2 relate to reactivity.
Computational chemistry: The use of mathematical models and computer simulations to study chemical systems. Computational calculations complement physical organic experiments by estimating structures and energy barriers.

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