TAILIEUCHUNG - Lecture Organic chemistry - Chapter 13: Alkynes: The C≡C Triple bond

Lecture Organic chemistry - Chapter 13: Alkynes: The C≡C Triple bond. This chapter presents the following content: Introduction to alkynes, natural occurrence and uses of alkynes, physical properties of alkynes, spectroscopy of alkynes, nomenclature of alkynes, acid-base properties of alkynes,. | Like alkenes, but ending -ene turns into –yne. HC CH Ethyne 5 4 3 2 1 1-Pentyne Br 1 2 3 4 5 6 5-Bromo-2-hexyne -ol -yne > OH 1 2 3 2-Propyn-1-ol Chapter 13: Alkynes: The C C Triple Bond Naming Priority: When the alkyne contains also double bonds, it is called an enyne. However, despite being an “yne”, numbering begins closest to either group: 1 2 3 4 5 6 3-Hexen-1-yne 1-Penten-4-yne When double and triple bond are equidistant from each terminus: ene first (alphabetical) 1 2 3 4 5 6 7 1-Hepten-4-yne 1 2 3 4 5 Substituents: Ethynyl 2-Propynyl (or propargyl) Smaller R is a substituent to larger R 3-Cyclobutyl-1-hexyne Ethynylcyclohexane but 1 2 2-Propenyl (or allyl) 1 2 Remember: Two perpendicular π bonds; sp hybrids R C C R Ethyne Structure The Triple Bond Is Energetic Heat of hydrogenation: more than two alkene bonds (which would be ~ -60 kcal mol-1) Acetylene torch: ~3,500 C Internal triple bond is more stable : : RC C H + B R C C + HB Hydrogens get more acidic (blue) - - pKa ~ .

• Hoá học
• Organic chemistry
• Lecture Organic chemistry
• Hóa học hữu cơ
• Bài giảng Hóa học hữu cơ
• Triple bond
• Preparation of alkynes
• In this workbook
• experiments are elaborated using small scale glassware and equipments from a Small Lab Kit
• developed at the Department of Chemistry
• Faculty of Science
• Chulalongkorn University in Thailand
• This Small Lab Kit was created as a result of the research project entitled “Chemistry Laboratory Based on Chemical Safety and Pollution Minimization” sponsored by Thai Research Fund (RDG 3 07 2543)
• One of the outcomes of this project is the organic laboratory book entitled “Organic Chemistry Laboratory Based on Chemical Safety and Pollution Minimization” written in Thai by professors from 7 universities in this project
• They compiled
• adjusted and tested the experiments taken from several traditional organic chemistry laboratory books using the prototype of Small Lab Kit
• Currently
• some selected experiments from this Thai organic chemistry laboratory text have further been modified
• rewritten and edited in English as appeared in this workbook
• Some experiments ar
• Ebook Organic chemistry
• Nucleophilic substitution
• Determining organic structures
• nucleophilic addition
• Organic structures
• Electrophilic aromatic substitution
• Principles of organic chemistry
• Methods of organic chemistry
• The methane series
• The acetylene series
• Polybasic acids
• High school
• University entrance exam
• Teaching organic chemistry
• Organic chemistry exam question
• Interdisciplinary science
• Advanced practical organic chemistry
• Functional groups
• Organic synthesis reagents
• The structure
• Reactions of organic names
• Fundamentals of organic chemistry
• Carbonyl alpha substitution reactions
• Condensation reactions
• Structure determination
• The organic chemistry
• Organic chemistry principles in context
• Starch to the principles
• The structures of organic molecules
• Mass spectrometers
• Infrared spectrometers
• Nuclear magnetic resonance spectrometers
• Modern physical organic chemistry
• Strain and stability
• Covalent binding forces
• Electronic organic materials
• Thermal pericyclic reactions
• The study of organic chemistry
• Stereochemistry and resonance
• Identification of organic compounds
• Elimination reactions
• Electrophilic addition reactions
• Electron delocalization
• Organic compounds
• Cyclic hydrocarbons
• Aromatic alcohols
• Aromatic compounds containing
• Inorganic chemistry
• A guidebook to mechanism in organic chemistry
• Aromatic systems
• Linear free energy relationships
• Symmetry controlled reactions
• Fatty acid catabolism
• The chemistry of the carbonyl group
• The industrial road toward increasing efficiency
• Chemistry of benzene
• Derivatives of benzene
• Summary of Organic Chemistry Dotoral Thesis
• Organic Chemistry Dotoral Thesis
• Natural Products Chemistry
• Biological evaluation
• Chemistry of natural compounds
• Ideas in chemistry
• Molecular sciences
• Synthetic chemistry
• Innovative processes in organic chemistry
• Predictive tools
• Organic chemical reactions
• Electronic Structure
• Electronic configurations of atoms
• Electronic configurations
• Wave properties of electrons
• Wave interactions
• Stereochemistry of alkanes
• Alkane conformations
• Chemical reactions
• Chlorination of Methane
• Chiral carbons
• Nonmobile conformers
• Alkyl Halides