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  2. Absolute configuration - Wikipedia

    en.wikipedia.org/wiki/Absolute_configuration

    Examples of absolute configuration of some carbohydrates and amino acids according to Fischer projection (D/L system) and Cahn–Ingold–Prelog priority rules (R/S system) The R/S system is an important nomenclature system for denoting enantiomers. This approach labels each chiral center R or S according to a system by which its substituents ...

  3. Molecular configuration - Wikipedia

    en.wikipedia.org/wiki/Molecular_configuration

    The molecular configuration of a molecule is the permanent geometry that results from the spatial arrangement of its bonds. [1] The ability of the same set of atoms to form two or more molecules with different configurations is stereoisomerism .

  4. Cahn–Ingold–Prelog priority rules - Wikipedia

    en.wikipedia.org/wiki/Cahn–Ingold–Prelog...

    More generally, for any pair of enantiomers, all of the descriptors are opposite: (R,R) and (S,S) are enantiomers, as are (R,S) and (S,R). Diastereomers have at least one descriptor in common; for example (R,S) and (R,R) are diastereomers, as are (S,R) and (S,S). This holds true also for compounds having more than two stereocenters: if two ...

  5. Descriptor (chemistry) - Wikipedia

    en.wikipedia.org/wiki/Descriptor_(Chemistry)

    The (R) configuration is assigned to the stereocenter if the direction of rotation is directed to the right. If one molecule contains several stereocenters, a locant must be placed before the descriptor (for example, in (1 R , 2 S )-2-amino-1-phenylpropan-1-ol, the systematic designation of norephedrine ).

  6. Enantiomer - Wikipedia

    en.wikipedia.org/wiki/Enantiomer

    There are three common naming conventions for specifying one of the two enantiomers (the absolute configuration) of a given chiral molecule: the R/S system is based on the geometry of the molecule; the (+)- and (−)- system (also written using the obsolete equivalents d- and l-) is based on its optical rotation properties; and the D/L system is based on the molecule's relationship to ...

  7. Today’s NYT ‘Strands’ Hints, Spangram and Answers for ...

    www.aol.com/today-nyt-strands-hints-spangram...

    We'll cover exactly how to play Strands, hints for today's spangram and all of the answers for Strands #283 on Wednesday, December 11. Related: 16 Games Like Wordle To Give You Your Word Game Fix ...

  8. Axial chirality - Wikipedia

    en.wikipedia.org/wiki/Axial_chirality

    Two types of molecules having axial chirality: allenes (left) and binaryl atropisomers (right) In chemistry, axial chirality is a special case of chirality in which a molecule contains two pairs of chemical groups in a non-planar arrangement about an axis of chirality so that the molecule is not superposable on its mirror image.

  9. Talk:Cahn–Ingold–Prelog priority rules - Wikipedia

    en.wikipedia.org/wiki/Talk:Cahn–Ingold–Prelog...

    how to assign R,S configuration to a chiral centre which is the more correct method- by performing even no. of exchanges (converting wedge formula into 2D) or in a 3D formula —Preceding unsigned comment added by 61.17.123.146 (talk • contribs) any illustrations that could be added would greatly enhance the effectiveness of this explanation.