From until , Topics in Stereochemistry appeared in 21 volumes edited by Ernest Eliel with assistance in part from Lou Allinger — and Sam Wilen — For five years, there was a short dormancy in this series, but not the field. Such a development required a renewed platform from which stereochemistry, broadly defined, could be presented.
Click for additional cheat sheets. A stereochemical group label is composed from an identifier and a group number. Louis Pasteur had shown in that tartaric acid has optical activity and that this depends on molecular asymmetry, and Jacobus H. Since this situation requires some special symmetry usually a plane of symmetry to be present, it is the unusual exception, not the rule. A racemic mixture is defined as being a one-to-one mixture of two enantiomers. The trans E diastereomer of 2-butene, for example, is slightly lower in energy than the cis Z diastereomer, as seen by their relative heats of hydrogenation to butane see section 2. They are non-superimposable mirror images of each other.
The series was revitalized in by Scott E. Denmark who edited two volumes single-handedly and commissioned a third on Materials Chemistry.
Jay S. Siegel joined forces with Scott E.
Denmark in as co-Editors-in-Chief of this series. Stereochemistry has increasingly important industrial applications with its effects on the physical properties of materials, polymers, liquid crystals and other materials and its role in areas such as drug discovery and synthetic chemistry.
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About this Book series This seminal series, first edited by Ernest Eliel, responsible for some of the major advances in stereochemistry and the winner of the ACS Priestley Medal in , provides coverage of the major developments of the field of stereochemistry. If we have a case like in the S N 2 reaction above, the molecule remains chiral throughout the reaction, so it keeps its pixie dust — so it stays optically active.
In a case like the S N 1 reaction above, the molecule loses its chirality in the middle, and now it has dropped its pixie dust! Now it has lost its optical activity, so any chiral product after that must be racemic — no pixie dust. The only way to get it back is if it meets another magical molecule which shares some of its own pixie dust. Later in this course we will design multi-step syntheses, where we will design a sequence of reactions to make a target product. Skip to main content. Search for:. Stereochemistry of reactions Soon we will begin to study organic reactions, so it is useful for us to consider how stereochemistry will affect the outcome of a reaction.
There are several questions that often arise when predicting what products will form: Some key questions.
A: If the molecule remains chiral at every stage — including intermediates — then yes. A: No, unless another optically active agent a reagent, catalyst, etc.
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