Course program
Structure and chemical bonds
The chemical bond. Electronegativity and polarity of the bond. Polarity of molecules. Carbon hybridization: ethane, ethylene, acetylene. Bond length and bond strength. Representation of organic structures. Lewis structures. The shape of the molecules. Resonance [2 hours].
Acids and bases
Acids and bases by Brønsted-Lowry. Reactions of acids and bases by Brønsted-Lowry. Acid strength and pKa. Prediction of equilibrium. Factors that affect acidity. Acids and bases by Lewis. Functional groups. Intermolecular forces. Physical properties. Functional groups and reactivity [2 hours].
Alkanes and cycloalkanes
Introduction. IUPAC nomenclature for alkanes and cycloalkanes. Common names. Physical properties. Conformation of acyclic alkanes (ethane, butane). Cycloalkanes. Cyclohexane (chair conformation, ring inversion). Cyclohexanes substituted (mono- and di-substituted) [2 x 2 hours].
Alkenes
IUPAC nomenclature (use of cis/trans and E/Z convention). Physical properties. Preparation of alkenes. Electrophilic addition reactions: hydrohalogenation (Markovnikov’s rule, stereochemistry); hydration; halogenation (stereochemistry) [3 x 2 ore].
Alkynes
IUPAC nomenclature. Physical properties. Preparation. Reactivity: acidity of terminal alkynes; hydrohalogenation; halogenation; hydration. Reactions of the acetylide anions [2 hours].
Conjugation, resonance and dienes
Conjugation. Resonance and allylic carbocations. The resonance hybrid. Delocalization of electrons, hybridization and geometry. Conjugated dienes: 1,3-butadiene [2 hours].
Stereochemistry
The two main classes of isomers. Chiral and achiral molecules. Stereogenic centers. Absolute R/S configuration. Diastereoisomers. Compounds with two or more stereogenic centers. Mesoforms and racemic mixtures. Physical properties of enantiomers (optical activity, specific rotation, enantiomeric excess) and diastereoisomers. Chemical properties of enantiomers [2 x 2 hours].
Organic reactions
Equations of organic reactions. Type of organic reactions (substitution, elimination, addition). Cleavage and formation of bonds (radicals, carbocations, carbanions). Bond dissociation energy. Thermodynamics (equilibrium constant and free energy changes) [concepts given during the different lessons].
Alkyl halides and substitution reactions
Introduction. IUPAC nomenclature. Physical properties. Polarity of the carbon-halogen bond. Nucleophilic substitution (halide, leaving group, nucleophile, solvent effect). SN2 and SN1 mechanism (kinetics, stereochemistry, nature of the halide, solvent effect). Stability of carbocations. Factors determining the SN2 or SN1 mechanism [2 x 2 hours].
Alkyl halides and elimination reactions
General features of elimination. Alkenes (C=C double bond, cis/trans isomers, stability). E2 and E1 elimination mechanism (kinetics, nature of halide). Zaitsev’s rule (regioselective and stereoselective reactions). Factors determining the E2 or E1 mechanism [2 x 2 hours].
Alcohols, ethers and epoxides
Structure, IUPAC nomenclature, physical properties. Preparations. Reactivity of alcohols: dehydration, reaction with halogenidric acids. Reactivity of ethers with strong acids. Reaction of epoxides with nucleophiles and with acids [2 x 2 hours].
Benzene and aromatic compounds
The structure of benzene. Nomenclature. Stability of benzene. Hückel's rule. Polycyclic aromatic hydrocarbons. Aromatic heterocycles (pyridine, pyrrole) [2 hours].
Electrophilic aromatic substitution (SEAr) reaction
General mechanism. Benzene halogenations (mechanism), nitration and sulphonation. Friedel-Crafts alkylation and acylation. Aromatic electrophilic substitution on substituted benzenes (effect of substituents on reactivity and orientation) [2 hours].
Amines
Structure, IUPAC nomenclature, physical properties. Preparation by direct nucleophilic substitution and by reduction of functional groups containing nitrogen; reductive amination [2 hours].
Introduction to the carbonyl chemistry. General reactivity of the carbonyl group: the nucleophilic addition reaction [2 hours]. Definition and IUPAC nomenclature. Carbon nucleophiles: addition of cyanidric acid and Grignard reagents. Oxygen nucleophiles: addition of water and alcohols. Hemiacetals and acetals formation [2 hours]. Nitrogen nucleophiles: addition of ammonia and primary and secondary amines. Imines and enamines. Reduction of aldehydes and ketones [2 x 2 hours].
Prerequisites
For an easy understanding of the topics covered in the course it is recommended to have acquired the basics of general and inorganic chemistry.
Books
One of the following books:
1) Autori Vari, Chimica Organica Essenziale, Edi-Ermes, Milano, 2018, 2° edizione (a cura di Bruno Botta).
2) John McMurry, Fondamenti di Chimica Organica, Zanichelli, Bologna, 2005.
3) William H. Brown, Thomas Poon, Introduzione alla Chimica Organica, EdiSES S.r.l., Napoli, III Ed.
For the chemistry of natural products:
Paul M. Dewick, Chimica, Biosintesi e Bioattività delle Sostanze Naturali, Piccin-Nuova Libraria, 2012.
Teaching mode
The course consists of frontal lectures and numerical exercises on the blackboard that are intended to prepare students for the written test.
During the lessons, the teacher stimulates the students with questions related to what it has just been presented, with the aim of making them participate and stimulate the study at home, lesson by lesson.
Students are invited to read the various textbooks recommended at the beginning of the course and to find, on them, the discussion of the various topics proposed in class.
Frequency
Attendance to the course is not mandatory, but strongly recommended.
Exam mode
The exam consists of a written test (lasting 1 hour) that serves for the admission to the oral exam, followed by the oral test. The written test is not given a grade, but only an admission decision (ADMITTED/NOT ADMITTED) to the oral test. Once the oral exam is also held, the student acquires the 9 total credits of the teaching (CFU), with a final grade.
The written test is structured in 12 open-ended exercises and may also contain a theoretical question on a reaction mechanism proposed in class. To access the written exam, students must register on the E-learning platform. The validity of the test is limited to one session only, namely January/February, June/July, September, November).
The oral exam consists of 3 questions on the whole program (average exam duration: 30 minutes). To achieve a score of 30/30 cum laude, the student must demonstrate that he has acquired excellent knowledge of all the topics covered during the course, showing a natural ability to quickly link between them. To access the oral exam, students must register on INFOSTUD.
Lesson mode
The course consists of frontal classes and numerical exercises on the blackboard that are intended to prepare students for the written test. During the lessons, the teacher stimulates the students with questions related to what it has just been presented, with the aim of making them participate and stimulate the study at home, lesson by lesson. Students are invited to read the various textbooks recommended at the beginning of the course and to find, on them, the discussion of the various topics proposed in class.