Course Overview

Introduction to Organic Chemistry 221G

This course provides a comprehensive introduction to the structure and dynamics of organic molecules, focusing on fundamental concepts, reaction mechanisms, and problem-solving strategies. Students will develop skills in molecular representation, reactivity analysis, and mechanism construction, preparing them for advanced study and practical applications in organic chemistry.

• Instructor: Dr. Oswaldo Nunez

• Textbook: Organic Chemistry, 4th Edition by David Klein

• Supplemental Text: Organic Chemistry as a Second Language (1st semester)

• Tools: Molecular model kit (allowed during exams), scientific calculator (non-programmable)

Student Learning Outcomes

Core Competencies

• Recognize Reactive Sites: Identify nucleophilic and electrophilic functional groups and predict their reactivity.

• Construct Reaction Mechanisms: Develop stepwise mechanisms based on electronic interactions, bond formation, and bond breaking. Recognize alternate routes, rearrangements, and possible side products.

• Describe Energetic States: Analyze reactions in terms of energy profiles, including starting materials, intermediates, transition states, and products. Assess relative stability.

Course Structure and Assessment

Exams and Grading

• Midterm Exams: Four midterms (60% of grade), with weighted contributions based on performance.

• Final Exam: Cumulative, scheduled for December 3 (20% of grade).

• Homework: Online via Achieve Homework System (8% of grade).

• Discussion Participation: Mandatory, using iClicker (10% of grade).

• Lecture Participation: iClicker-based (2% of grade).

Grading Scale

Course Topics and Weekly Schedule

Module Breakdown

• Module 1: Organic Chemistry as a Second Language (Klein Ch. 1, 2)

• Module 2: Bonding Theories, Polarity, and Intermolecular Forces (Klein 1, 26.1-26.3)

• Module 3: Resonance (Klein 2)

• Module 4: Drawing and Interpreting Molecules in 3D (Klein 4.5-4.15)

• Module 5: Stereoisomerism (Klein 5)

• Module 6: Acids and Bases (Klein 3, 25.1-25.2, 6)

• Module 7: Chemical Reactivity (Klein 6)

• Module 8: Mechanisms: Nucleophilic Substitution and Elimination Reactions (Klein 7)

• Module 9: Addition Reactions (Klein 8, 9)

• Module 10: Introduction to Synthesis

Additional info: Nomenclature is emphasized throughout multiple modules, referencing Klein sections 4.1-4.5, 7.2, 7.7, 9.2, 12.1, 13.2, 19.2, 20.2, 22.2.

Key Organic Chemistry Concepts

Bonding Theories and Polarity

Understanding atomic and molecular bonding is fundamental to organic chemistry. Bonding theories explain how atoms combine to form molecules, while polarity and intermolecular forces determine molecular interactions and physical properties.

• Bonding Theories: Valence Bond Theory, Molecular Orbital Theory

• Polarity: Determined by differences in electronegativity and molecular geometry

• Intermolecular Forces: Includes hydrogen bonding, dipole-dipole, and London dispersion forces

• Example: Water's high boiling point is due to strong hydrogen bonding.

Resonance

Resonance describes the delocalization of electrons within molecules, stabilizing structures and affecting reactivity.

• Resonance Structures: Multiple valid Lewis structures for a molecule

• Stabilization: Resonance increases molecular stability

• Example: The acetate ion exhibits resonance between two oxygen atoms.

Stereoisomerism

Stereoisomerism refers to molecules with the same connectivity but different spatial arrangements, crucial for understanding chirality and optical activity.

• Types: Enantiomers (mirror images), Diastereomers (non-mirror image stereoisomers)

• Chirality: Presence of a chiral center leads to optical activity

• Example: Lactic acid exists as two enantiomers, only one of which is biologically active.

Acids and Bases

Acid-base chemistry is central to organic reactions, influencing mechanism and product formation.

• Brønsted-Lowry Theory: Acids donate protons, bases accept protons

• Lewis Theory: Acids accept electron pairs, bases donate electron pairs

• pKa: Quantifies acid strength; lower pKa indicates stronger acid

• Example: Carboxylic acids are stronger acids than alcohols.

Reaction Mechanisms

Mechanisms illustrate the stepwise transformation of reactants to products, including nucleophilic substitution and elimination reactions.

• Nucleophilic Substitution: SN1 (two-step, carbocation intermediate), SN2 (one-step, concerted)

• Elimination: E1 (two-step), E2 (one-step)

• Example: Alkyl halide reacts with hydroxide to form alcohol via SN2 mechanism.

Key Equations:

• (Gibbs free energy equation)

• (Acid dissociation constant)

Study Strategies and Success Tips

Effective Learning Approaches

• Practice: Work numerous problems, including book, homework, and practice problems.

• Study Groups: Collaborate with peers to enhance understanding and retention.

• Active Participation: Attend lectures, discussions, and workshops regularly.

• Repetition: Review material frequently to reinforce learning.

• Conceptual Understanding: Master theory before attempting problems.

• Self-Assessment: Learn from mistakes and seek help when needed.

Additional info: Note cards are recommended for memorizing reactions and mechanisms. Students are encouraged to utilize office hours and campus resources for support.

Course Policies and Resources

Attendance, Academic Integrity, and Accommodations

• Attendance: Strongly recommended; inform instructor of planned absences.

• Academic Integrity: Adherence to University of Miami honor code is required.

• Disability Services: Accommodations available through Office of Disability Services.

• Well-Being: Access campus resources for health and support.

• Exam Policy: Strict guidelines for calculators, model kits, and personal items during exams.

Summary Table: Course Modules and Key Topics