Introduction to Organic Chemistry and Carbohydrates

Introduction to Organic Chemistry

• Overview of the importance and relevance of organic chemistry.

  • Many students may not have a background in organic chemistry, leading to uncertainties regarding its necessity.

  • Essential connections to real-life applications, including:

  • Everyday products (food, clothing).

  • Pharmaceuticals and medicine derived from organic compounds.

  • Organic chemistry forms the foundational basis for many areas of science and technology.

Classification of Compounds

• Compounds can be classified into two main categories:

  • Organic Compounds

  • Inorganic Compounds

• Focus of this unit: Organic compounds. Differentiation from inorganic compounds is essential.

Definition of Organic Chemistry

• Organic chemistry defined by Carben Bergmann in 1770 as the chemistry of carbon-containing compounds that occur naturally.

• The Vital Force theory suggested that organic compounds could only originate from living organisms.

• Frederick Wöhler’s synthesis of urea from ammonium cyanide in 1827 challenged this theory, leading to a refined definition:

  • Organic chemistry now refers to all carbon-containing compounds, irrespective of origin.

• Noteworthy exceptions to this definition:

  • Compounds such as carbon dioxide (CO₂), carbon monoxide (CO), cyanides, bicarbonates, and carbonates, all containing carbon yet considered inorganic due to historical classification.

Examples of Organic Molecules

• Common examples include:

  • Paracetamol (acetaminophen): structure contains carbon, nitrogen, hydrogen, and oxygen.

  • Cetirizine: an active ingredient in asthma medications.

  • Acetylcholine: a neurotransmitter present in many areas of the nervous system.

The Scope of Organic Chemistry

• The significance of organic compounds extends to various biological macromolecules:

  • Carbohydrates (e.g., glucose, sucrose).

  • Proteins and amino acids.

  • Lipids (e.g., oleic acid).

  • Products like anabolic steroids (synthetic variations of testosterone).

• Examples of potential misuses of organic compounds:

  • Morphine and its naturally occurring derivatives that lead to performance-enhancing drug discussions in sports.

Compound Diversity and Classification

• Approximately 500,000 inorganic compounds and over 11 million known organic compounds:

  • Continuous discovery and synthesis of new organic compounds.

• The necessity of classifying organic compounds into functional groups to predict their properties and reactions:

  • Functional groups discussed include:

  • Hydrocarbons (alkanes, alkenes, alkynes, aromatics).

  • Alcohols, ethers, aldehydes, ketones, carboxylic acids, esters, amines, nucleic acids, etc.

Understanding Structural Isomerism

• Importance of molecular structure and how minor changes can lead to dramatically different properties:

  • Example: Morphine vs. codeine (both are derived from the opium poppy).

• Explanation of enantiomers:

  • S-ibuprofen is the active form, while R-ibuprofen is inactive, demonstrating the significance of spatial arrangement.

• Concept of non-superimposable mirror images discussed with practical examples (e.g., human hands).