SciShow
Thalidomide: The Chemistry Mistake That Killed Thousands of Babies
On October 1, 1957, thalidomide was introduced as a new morning sickness cure. Everything seemed great until later the next year, when thousands of infants were born with severe birth defects.
Curated Video
Conditions for Optical Activity: When Molecules Twist Light
For a molecule to exhibit optical activity, it must be chiral, meaning it has no internal plane of symmetry. Additionally, the solution or compound should not contain equal amounts of enantiomers (racemic mixture), as these cancel out...
Curated Video
Optical Activity: When Light Meets Molecules
Optical activity refers to the ability of chiral compounds to rotate the plane of polarized light. Compounds that rotate light clockwise are termed dextrorotatory (+), while those that rotate it counterclockwise are levorotatory (−). The...
Curated Video
Optical Isomerism: The Chemistry of Mirror Images
Optical isomerism occurs in molecules that are chiral, meaning they cannot be superimposed on their mirror images. These isomers, known as enantiomers, differ in their optical activity—they rotate plane-polarized light in opposite...
Catalyst University
Carbohydrate Stereochemistry Epimers and Anomers
Carbohydrate Stereochemistry Epimers and Anomers
Professor Dave Explains
Stereochemistry: Meso Compounds, Diastereomers
Defining meso compounds, inversion centers, and diastereomers.
Professor Dave Explains
Practice Problem: Types of Protons
We learned about how pairs of protons can have specific relationships. They can be homotopic, enantiotopic, diastereotopic, or heterotopic. Let's apply this to some examples!
Professor Dave Explains
Practice Problem: Hydrogenation, Isomerism, and Cyclohexane Chairs
For this one we need to understand the stereospecificity of hydrogenation over platinum metal, stereochemical relationships, and the relative stability of cyclohexane chair conformations.
Catalyst University
Carbohydrate Stereochemistry Diastereomers and Enantiomers
Carbohydrate Stereochemistry Diastereomers and Enantiomers
Professor Dave Explains
Stereochemistry: Enantiomers
Defining stereochemistry and enantiomeric relationships.
Khan Academy
Stereoisomers, Enantiomers, Diastereomers, Constitutional Isomers and Meso Compounds
Sal works through a list of examples that demonstrate and review the different types of compound classification.
Khan Academy
Stereoisomers, Enantiomers, Diastereomers, Constitutional Isomers and Meso Compounds
Sal works through a list of examples that demonstrate and review the different types of compound classification.
Khan Academy
Khan Academy: Biology: Properties of Carbons: Isomers
Learn about structural isomers, stereoisomers, geometric isomers, cis-trans isomers, and enantiomers n this video. [6:48]
Khan Academy
Khan Academy: Diastereomers and Meso Compounds: Stereoisomers, Enantiomers,
This video looks at pairs of molecules to see if they relate to each other in obvious or less than obvious ways, for example, by having the same molecular formula but different structures. The video looks at stereoisomers, enantiomers,...
Khan Academy
Khan Academy: Cahn Ingold Prelog System for Naming Enantiomers
Explains the proper method of naming Enantiomers.
Khan Academy
Khan Academy: Stereoisomers/enantiomers/diastereomers/const Isomers/meso Comps
In this video, Sal Khan looks at pairs of molecules to see if they relate to each other. [13:35]