CHEM 125A - Freshman Organic Chemistry I
Lecture 23 - Valence Theory and Constitutional Structure (1858). Youthful chemists Couper and Kekule replaced radical and type theories with a new approach involving atomic valence and molecular structure, and based on the tetravalence and self-linking of carbon. Valence structures offered the first explanation for isomerism, and led to the invention of nomenclature, notation, and molecular models closely related to those in use today. (from oyc.yale.edu)
| Lecture 23 - Valence Theory and Constitutional Structure (1858) |
| Time | Lecture Chapters |
| [00:00:00] | 1. Archibald Couper: "Look to the Elements" |
| [00:10:25] | 2. Tetravalence and Self-Linking of Carbon |
| [00:19:40] | 3. Kekule's Advancements in Chemical and Molecular Notation |
| [00:38:33] | 4. 3-D Molecular Models: From Brass Strips to Croquet-Balls |
| References |
| Lecture 23 - Valence Theory and Constitutional Structure (1858) Instructor: Professor J. Michael McBride. Resources: Professor McBride's website resource for CHEM 125 (Fall 2008). Transcript [html]. Audio [mp3]. Download Video [mov]. |
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