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stereospecificity

Examples

Videos

  • diels alder stereo Mechanism of Diels-Alder reaction showing stereospecificity of reaction
  • Photocycloaddition Reactions This webcast explains why cycloaddition reactions that are thermally forbidden become photochemically allowed.
  • Stereochemistry in the Diels-Alder Reaction The origin of stereospecificity and stereoselectivity in the Diels-Alder reaction.
  • FMO ***ysis for the [1,j] Sigmatropic Reactions (8.6) FMO ***ysis of the [1,j] sigmatropic reactions predicts that the [1,3] reaction is unlikely;in contrast, the [1,5] reaction is stereospecific with the migrating atom exiting and entering the same face.
  • Force-Activated Electrocyclic Rearrangements (8.8) My research group demonstrated that mechanical force could be use to accelerate and alter the reaction pathway of electrocyclic ring opening reactions. We used this to prepare a polymeric material that changes color when force is applied.
  • Diels-Alder Stereochemistry Explained Explanations of Diels-Alder stereochemistry and reactivity.
  • Of Strange Objects and Meaning in the Universe How can we say which is a natural object and which is an artefact? We recognize artificial objects (machinery, arrowheads), because we, ourselves, make objects with a purpose. Objective criteria for judging artificial objects from structure and shape are: 1/ regularity (natural objects don't have flat surfaces, right angles) and 2/ repeatedness. By them, though, living beings would be judged artificial objects, too. Living beings are strange objects, they alone in the universe, have teleonomy - purpose, intent. That purpose, intent, is preservation and multilication. This comes about from the chemical properties of stereospecificity of proteins, for example. (All is biochemistry!). Another basic characteristics of living beings is invariance (DNA), and it is primary to teleonomy. Humans falsely think that inanimous objects also have teleonomy, or that there are gods that created them. Humans always are looking for meaning, but they are the only ones in the universe, who have meaning and can make meaning. I closely follow Jacques Monod's essay "Chance and Necessity". There are other things that can be said from it, in another video. Sorry about the many cuts, but you try to explain such a basic idea fluently in a foreign language, and not with slogans, like Craig does! :)
  • Sn1 and Sn2 epoxide opening discussion
  • Mechanism and FMO ***ysis of the Diels-Alder Reaction How molecular orbital theory can be used to explain nearly every experimental observation made about the Diels-Alder reaction