A 1.5-dimensional version of Hopfs Theorem on the number of by Bieri R.

By Bieri R.

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Extra resources for A 1.5-dimensional version of Hopfs Theorem on the number of ends of a group

Example text

The conventional drawings given in this figure are intended to represent the tetrahedral geometry of a carbon atom CHO CHO OH H CH2OH (a) HO H CH2OH (b) Fischer projections of glyceraldehyde enantiomers: (a) D-( þ )glyceraldehyde; (b) L-(À)-glyceraldehyde. 12. 13. Structure of L-amino acids. with the solid horizontal line in front of the plane of the paper and the vertical line representing substituents in the back of the plane of the paper. The enantiomeric identity denoted by small capital letters is D and L.

Among them were the Royal Society President Sir Christopher Ingold, the editor of the Chemical Society Journal, Robert Cahn, and Swiss chemist Vladimir Prelog. Apparently, after a “vigorous” criticism by Dr. Prelog of a recent paper, he was invited by Drs. Afterseveralmeetings,theprinciplesofthe new nomenclaturesystemwerepublishedin theSwissjournal Experientia in 1956. (Current Contents, Dec. 13, 1982, p. ) In order to name these structures in an unambiguous way, European chemists Robert S. , 1).

We have described several ways of doing this, and exactly how we choose to define a chiral structure varies a bit with the particular system under investigation and the nature of the asymmetry or dissymmetry. In virtually every case, our frame of reference for nomenclature is the fact that we are “handed,” and objects are often referred to as being right-handed or lefthanded. Hopefully, it is obvious to the reader of this chapter that the connection between right-handed people and righthanded helices or right-handed amino acids and so on is, however, not very meaningful.

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