Lecture Organic chemistry: Chapter 13 – Trường ĐH Bách khoa TP. HCM

Amines and diazonium salts represent two critically important classes of organic compounds, fundamental to the broader field of organic chemistry. Amines, characterized by the presence of a nitrogen atom with a lone pair, serve as versatile building blocks in chemical synthesis and are ubiquitous in biological systems, pharmaceuticals, and industrial applications. Diazonium salts, derived from primary amines, are highly reactive intermediates crucial for synthesizing a wide array of substituted aromatic compounds through various displacement reactions. Understanding their nomenclature, structural properties, and synthetic pathways is essential for advanced studies and practical applications in chemistry, providing a foundational knowledge base for manipulating and designing complex organic molecules.

Undergraduate and graduate students studying organic chemistry, researchers in synthetic organic chemistry, and professionals in pharmaceutical or chemical industries.

This academic material provides a comprehensive overview of amines and diazonium salts, commencing with a detailed exploration of their nomenclature. It distinguishes between common naming conventions, which often combine alkyl group names with 'amine', and the systematic IUPAC nomenclature, which typically appends 'amine' to the alkane name or uses 'amino' as a substituent. Various examples illustrate the naming of primary, secondary, and tertiary amines, including those with halogen or alkyl substituents, and cyclic structures, emphasizing the alphabetical order of substituents and carbon chain numbering.

Following nomenclature, the document delves into the preparations of amines, outlining several key synthetic methodologies. The alkylation of ammonia is presented as a fundamental route, demonstrating how primary, secondary, tertiary amines, and even quaternary ammonium salts can be formed depending on reaction conditions. The Gabriel synthesis is specifically highlighted as a valuable method for exclusively preparing primary amines, thus avoiding over-alkylation. Furthermore, the material covers the reduction of various functional groups to yield amines, including the reduction of nitriles, amides, and oximes. A significant portion is dedicated to the preparation of arylamines, detailing reduction strategies for nitro compounds using agents like H2/Pd, Fe/HCl, or Sn/HCl. Notably, the concept of selective reduction of nitro groups using specific reagents like (NH4)2S is introduced, showcasing precise control over synthetic outcomes. This systematic approach underscores the synthetic versatility and importance of amines and diazonium salts as crucial intermediates in organic synthesis, enabling the construction of diverse chemical structures with wide-ranging applications.