CHEM C243AStructure and Mechanism in Organic Chemistry

Chemistry and Biochemistry · 4 units · Graduate courses (200-299)

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Mechanisms of organic reactions. Acidity and acid catalysis; linear free energy relationships; isotope effects. Molecular orbital theory; photochemistry; pericyclic reactions. May be concurrently scheduled with course C143A.

S/U or letter grading.

When it runs

Winter 2026
Winter 2027

Scheduled, not typical — from UCLA’s Schedule of Classes, which publishes Fall 2025 through Spring 2027 and nothing before it.

Requisites

Official UCLA wording
Requisites: courses 30C and 30CL (may be taken concurrently), 110B, and 113A, with grades of C– or better.

BruinTree reads · Prerequisite

confidence 1.00 · from text

grade C- or better in

all of
- CHEM 30C
- CHEM 30CLmay be taken concurrently
- CHEM 110B
- CHEM 113A

Requires

Everything that has to come before this course, not just the courses named in the requisite above.

CHEM C243A

CHEM 30COrganic Chemistry III: Reactivity, Synthesis, and Biomolecules
- CHEM 30BOrganic Chemistry II: Reactivity, Synthesis, and Spectroscopy
  - CHEM 30AOrganic Chemistry I: Structure and Reactivity
CHEM 30CLOrganic Chemistry Laboratory II
- CHEM 30BOrganic Chemistry II: Reactivity, Synthesis, and Spectroscopyanother path to it
- CHEM 30BLOrganic Chemistry Laboratory I
  - CHEM 30AOrganic Chemistry I: Structure and Reactivityanother path to it
  - CHEM 30ALGeneral Chemistry Laboratory II2 more beneath
  - CHEM 30BOrganic Chemistry II: Reactivity, Synthesis, and Spectroscopyanother path to it
- CHEM 30COrganic Chemistry III: Reactivity, Synthesis, and Biomoleculesanother path to it
CHEM 110BTopics in Physical Chemistry
- CHEM 110APhysical Chemistry: Chemical Thermodynamics6 more beneath
  - CHEM 14AGeneral Chemistry for Life Scientists I2 more beneath
  - CHEM 14AEGeneral Chemistry for Life Scientists I—Enhanced2 more beneath
  - MATH 3COrdinary Differential Equations with Linear Algebra for Life Sciences Students
  - CHEM 14BGeneral Chemistry for Life Scientists II1 more beneath
  - CHEM 14BEGeneral Chemistry for Life Scientists II—Enhanced1 more beneath
  - PHYSICS 1APhysics for Scientists and Engineers: Mechanicsanother path to it
  - CHEM 20AChemical Structureanother path to it
  - CHEM 20AHChemical Structure (Honors)another path to it
- CHEM 113APhysical Chemistry: Introduction to Quantum Mechanicsanother path to it
- MATH 32BCalculus of Several Variables
  - MATH 31BIntegration and Infinite Series
  - MATH 32ACalculus of Several Variablesanother path to it
CHEM 113APhysical Chemistry: Introduction to Quantum Mechanics5 more beneath
- CHEM 20BChemical Energetics and Change
  - CHEM 14AGeneral Chemistry for Life Scientists Ianother path to it
  - CHEM 14AEGeneral Chemistry for Life Scientists I—Enhancedanother path to it
  - MATH 31ADifferential and Integral Calculusanother path to it
  - CHEM 20AChemical Structure
  - CHEM 20AHChemical Structure (Honors)
- MATH 32ACalculus of Several Variables
  - MATH 31ADifferential and Integral Calculus1 more beneath
- PHYSICS 1APhysics for Scientists and Engineers: Mechanics
  - MATH 31ADifferential and Integral Calculusanother path to it
  - MATH 31BIntegration and Infinite Seriesanother path to it
  - MATH 32ACalculus of Several Variablesanother path to it
- MATH 32BCalculus of Several Variablesanother path to it
- PHYSICS 1AHPhysics for Scientists and Engineers: Mechanics (Honors)
  - MATH 31ADifferential and Integral Calculusanother path to it
  - MATH 31BIntegration and Infinite Seriesanother path to it
  - MATH 32ACalculus of Several Variablesanother path to it
- MATH 33ALinear Algebra and Applications
  - MATH 3BCalculus for Life Sciences Students1 more beneath
  - MATH 31BIntegration and Infinite Seriesanother path to it
  - MATH 32ACalculus of Several Variablesanother path to it
- PHYSICS 1BPhysics for Scientists and Engineers: Oscillations, Waves, Electric and Magnetic Fields
  - MATH 31BIntegration and Infinite Seriesanother path to it
  - PHYSICS 1APhysics for Scientists and Engineers: Mechanicsanother path to it
  - MATH 32ACalculus of Several Variablesanother path to it
- PHYSICS 1BHPhysics for Scientists and Engineers: Oscillations, Waves, Electric and Magnetic Fields (Honors)
  - MATH 31BIntegration and Infinite Seriesanother path to it
  - PHYSICS 1APhysics for Scientists and Engineers: Mechanicsanother path to it
  - MATH 32ACalculus of Several Variablesanother path to it

4 direct requisites. Showing 54 courses over 3 levels; the branches marked with a count carry on past it. Every course here opens its own tree.

Unlocks

What this course is a requisite for, and what those courses lead to in turn.

CHEM C243A

CHEM 236Spectroscopic Methods of Organic Chemistry
CHEM 241ASpecial Topics in Organic Chemistry
CHEM 241BSpecial Topics in Organic Chemistry
CHEM 241DSpecial Topics in Organic Chemistry
CHEM 241FSpecial Topics in Organic Chemistry
CHEM C243BOrganic Chemistry: Mechanism and Structure
CHEM 244BStrategy and Design in Organic Synthesis

7 courses list this as a requisite. The whole downstream is here — 7 courses over 1 level. Every course here opens its own tree.

Requisites

Official UCLA wording

Requisites: courses 30C and 30CL (may be taken concurrently), 110B, and 113A, with grades of C– or better.

BruinTree reads · Prerequisite

confidence 1.00 · from text

grade C- or better in

all of
- CHEM 30C
- CHEM 30CLmay be taken concurrently
- CHEM 110B
- CHEM 113A

Requires

Everything that has to come before this course, not just the courses named in the requisite above.

CHEM C243A

CHEM 30COrganic Chemistry III: Reactivity, Synthesis, and Biomolecules
- CHEM 30BOrganic Chemistry II: Reactivity, Synthesis, and Spectroscopy
  - CHEM 30AOrganic Chemistry I: Structure and Reactivity
CHEM 30CLOrganic Chemistry Laboratory II
- CHEM 30BOrganic Chemistry II: Reactivity, Synthesis, and Spectroscopyanother path to it
- CHEM 30BLOrganic Chemistry Laboratory I
  - CHEM 30AOrganic Chemistry I: Structure and Reactivityanother path to it
  - CHEM 30ALGeneral Chemistry Laboratory II2 more beneath
  - CHEM 30BOrganic Chemistry II: Reactivity, Synthesis, and Spectroscopyanother path to it
- CHEM 30COrganic Chemistry III: Reactivity, Synthesis, and Biomoleculesanother path to it
CHEM 110BTopics in Physical Chemistry
- CHEM 110APhysical Chemistry: Chemical Thermodynamics6 more beneath
  - CHEM 14AGeneral Chemistry for Life Scientists I2 more beneath
  - CHEM 14AEGeneral Chemistry for Life Scientists I—Enhanced2 more beneath
  - MATH 3COrdinary Differential Equations with Linear Algebra for Life Sciences Students
  - CHEM 14BGeneral Chemistry for Life Scientists II1 more beneath
  - CHEM 14BEGeneral Chemistry for Life Scientists II—Enhanced1 more beneath
  - PHYSICS 1APhysics for Scientists and Engineers: Mechanicsanother path to it
  - CHEM 20AChemical Structureanother path to it
  - CHEM 20AHChemical Structure (Honors)another path to it
- CHEM 113APhysical Chemistry: Introduction to Quantum Mechanicsanother path to it
- MATH 32BCalculus of Several Variables
  - MATH 31BIntegration and Infinite Series
  - MATH 32ACalculus of Several Variablesanother path to it
CHEM 113APhysical Chemistry: Introduction to Quantum Mechanics5 more beneath
- CHEM 20BChemical Energetics and Change
  - CHEM 14AGeneral Chemistry for Life Scientists Ianother path to it
  - CHEM 14AEGeneral Chemistry for Life Scientists I—Enhancedanother path to it
  - MATH 31ADifferential and Integral Calculusanother path to it
  - CHEM 20AChemical Structure
  - CHEM 20AHChemical Structure (Honors)
- MATH 32ACalculus of Several Variables
  - MATH 31ADifferential and Integral Calculus1 more beneath
- PHYSICS 1APhysics for Scientists and Engineers: Mechanics
  - MATH 31ADifferential and Integral Calculusanother path to it
  - MATH 31BIntegration and Infinite Seriesanother path to it
  - MATH 32ACalculus of Several Variablesanother path to it
- MATH 32BCalculus of Several Variablesanother path to it
- PHYSICS 1AHPhysics for Scientists and Engineers: Mechanics (Honors)
  - MATH 31ADifferential and Integral Calculusanother path to it
  - MATH 31BIntegration and Infinite Seriesanother path to it
  - MATH 32ACalculus of Several Variablesanother path to it
- MATH 33ALinear Algebra and Applications
  - MATH 3BCalculus for Life Sciences Students1 more beneath
  - MATH 31BIntegration and Infinite Seriesanother path to it
  - MATH 32ACalculus of Several Variablesanother path to it
- PHYSICS 1BPhysics for Scientists and Engineers: Oscillations, Waves, Electric and Magnetic Fields
  - MATH 31BIntegration and Infinite Seriesanother path to it
  - PHYSICS 1APhysics for Scientists and Engineers: Mechanicsanother path to it
  - MATH 32ACalculus of Several Variablesanother path to it
- PHYSICS 1BHPhysics for Scientists and Engineers: Oscillations, Waves, Electric and Magnetic Fields (Honors)
  - MATH 31BIntegration and Infinite Seriesanother path to it
  - PHYSICS 1APhysics for Scientists and Engineers: Mechanicsanother path to it
  - MATH 32ACalculus of Several Variablesanother path to it

4 direct requisites. Showing 54 courses over 3 levels; the branches marked with a count carry on past it. Every course here opens its own tree.

Unlocks

What this course is a requisite for, and what those courses lead to in turn.

CHEM C243A

CHEM 236Spectroscopic Methods of Organic Chemistry
CHEM 241ASpecial Topics in Organic Chemistry
CHEM 241BSpecial Topics in Organic Chemistry
CHEM 241DSpecial Topics in Organic Chemistry
CHEM 241FSpecial Topics in Organic Chemistry
CHEM C243BOrganic Chemistry: Mechanism and Structure
CHEM 244BStrategy and Design in Organic Synthesis

7 courses list this as a requisite. The whole downstream is here — 7 courses over 1 level. Every course here opens its own tree.

CHEM C243AStructure and Mechanism in Organic Chemistry

When it runs

Requisites

Report a problem

Requires

Unlocks

Report a problem

CHEM C243AStructure and Mechanism in Organic Chemistry

When it runs

Requisites

Report a problem

Requires

Unlocks