Detailed Course Description:
Organic compounds of interest to chemists, biologists, and those studying and researching in all areas of medicine and health sciences range from the structurally simple to the very complex. Fortunately, organic compounds can be classified into a relatively small number of structurally similar groups. The similarity in structure means similarity in physical properties and often reactivity. Thus a reasonable approach to providing a sound basis for an understanding of organic molecules is to commence with the simplest organic molecules, identify their common features, and gradually progress to more complex molecules.
1.1 INTRODUCTION and FOUNDATIONS (7-8 hours) Structure and bonding in organic molecules. Functional groups and their nomenclature. Isomerism: Constitutional and conformational. Configurational isomerism in relation to alkenes (E-Z nomenclature) and cycloalkenes. Chirality and optical activity. R and S convention. Bonding and reactions: Electronegativity, bond polarity, and physical properties. Chromatography. Homolytic and heterolytic bond breaking and bond making. Intermediates and reaction classifications.
1.2 FUNCTIONAL GROUP CHEMISTRY (14 hours) Alkenes: Synthesis from alkyl halides and alcohols; catalytic hydrogenation. Additions initiated by the addition of proton, stability of alkyl substituted carbocations; bromine, stereochemistry, and the bromonium ion. Alkynes: Synthesis from vinyl halides and by nucleophilic substitution using acetylide anions. Catalytic hydrogenation, complete and partial. Electrophilic additions. Aromatics: The structure of benzene and resonance energy. Electrophilic aromatic substitutions; bromination, chlorination, nitration, alkylation, and acylation of benzene; activation and deactivation; ortho‐ para- and meta-directors. Phenols: From benzenediazonium salts. Acidity. Alkyl halides: Bromides and chlorides by HX addition to alkenes and HX substitution of alcohols. SN1 and SN2 reaction mechanisms; stereochemistry. E1 and E2 compete with SN; stereochemistry. Preparation of organometallic halides. Ethers: From alkyl halides and alcohols or phenols. Alcohols: From alkenes, alkyl halides, aldehydes, ketones, and esters. Amphoteric nature of alcohols. Substitution and elimination reactions. Grignard synthesis. Aldehydes and ketones: Properties of the C=O bond. Synthesis by acylation of aromatic rings, oxidation of alcohols. Nucleophilic addition of NaBH4, RMgX, ROH, H2O. Hemiacetals and acetals. Carboxylic acids: Preparations by oxidation of alcohols, aldehydes, and aliphatic side-‐chains; by carboxylation of organometallic halides and by nitrile hydrolysis including cyanohydrins. Relative acidities of carboxylic acids. Carboxylic acid derivatives: Acyl halides, anhydrides, esters, amides, and nitriles, their hydrolysis and interconversions. Nucleophilic acyl substitution. Ester reactions with RMgX, LiAlH4. Amines: Synthesis from alkyl halides and ammonia; from imines, amides, nitrile, and nitro compounds. Base strength and reactions as nucleophiles. Quaternary ammonium salts. Aromatic amines; synthesis by reduction of ArNO2 and benzene diazonium ions. Amino acids: structures, structure in acidic, neutral, and basic solutions, configuration, reactions to form peptides including the use of protecting groups, structure and function of proteins using enzymes as examples. Carbohydrates: Configuration of monosaccharides, cyclic structures of monosaccharides, monosaccharide anomers, and mutarotation. Reactions of monosaccharides.
1.3 SPECTROSCOPY (5 hours) Mass spectrometry and the molecular ion. Ultraviolet-visible, its use in detecting π bonds and conjugated systems, and Beer’s Law. Infrared and 13C and 1H nuclear magnetic resonance. Use of spectroscopic methods to identify specific structural units present in molecules, and structure determination of molecules.
1.4 KINETICS (4-5 hours) Definition and measurement of reaction rates; qualitative effects of concentration, temperature, and catalysts on reaction rates; reaction order and rate laws; integrated rate laws in simple systems; Arrhenius equation and activation energy, interpretation in terms of collision theory; reaction mechanisms, rate‐limiting steps, intermediates, and transition states; common organic reaction mechanisms and rate laws; catalysis and enzymes; design of reaction conditions for the desired outcome based on kinetic concepts.
1.5 ACIDS AND BASES (5 hours) Definition of acids and bases, proton transfer reactions; strengths of acids, Ka and pKa; relation of acid strength to structure; pH and species present in acid/base/salt solutions; titration curves and indicators; buffer solutions and applications; the role of very strong acids and bases in organic chemistry; effect of pH on charged species (especially biological molecules), electrophoresis; acid rain, soil chemistry, and pH, pH, and color in biological systems.