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• Absolute_configuration abstract "An absolute configuration in stereochemistry refers to the spatial arrangement of the atoms of a chiral molecular entity (or group) and its stereochemical description e.g. R or S, referring to Rectus, or Sinister, respectively.Absolute configurations for a chiral molecule (in pure form) are most often obtained by X-ray crystallography. All enantiomerically pure chiral molecules crystallise in one of the 65 Sohncke groups (chiral space groups).Alternative techniques are Optical rotatory dispersion, vibrational circular dichroism and the use of chiral shift reagents in proton NMR and Coulomb Explosion Imaging.When the absolute configuration is obtained the assignment of R or S is based on the Cahn–Ingold–Prelog priority rules.Absolute configurations are also relevant to characterization of crystals.Until 1951 it was not possible to obtain the absolute configuration of chiral compounds. It was at some time decided that (+)-glyceraldehyde was the (R)-enantiomer. The configuration of other chiral compounds was then related to that of (+)-glyceraldehyde by sequences of chemical reactions. For example, oxidation of (+)-glyceraldehyde (1) with mercury oxide gives (−)-glyceric acid (2), a reaction that does not alter the stereocenter. Thus the absolute configuration of (−)-glyceric acid must be the same as that of (+)-glyceraldehyde. Nitric acid oxidation of (+)-isoserine (3) gives (–)-glyceric acid, establishing that (+)-isoserine also has the same absolute configuration. (+)-Isoserine can be converted by a two-stage process of bromination and zinc reduction to give (–)-lactic acid, therefore (–)-lactic acid also has the same absolute configuration. If a reaction gave the enantiomer of a known configuration, as indicated by the opposite sign of optical rotation, it would indicate tha the absolute configuration is inverted.determination of relationships in absolute configurationIn 1951 Johannes Martin Bijvoet for the first time used in X-ray crystallography the effect of anomalous dispersion, which is now referred to as resonant scattering, to determine absolute configuration. The compound investigated was (+)-sodium rubidium tartrate and from its configuration (R,R) it was deduced that the original guess for (+)-glyceraldehyde was correct.".
• Absolute_configuration thumbnail R_S_configuration.png?width=300.
• Absolute_configuration wikiPageID "7587207".
• Absolute_configuration wikiPageLength "9680".
• Absolute_configuration wikiPageOutDegree "40".
• Absolute_configuration wikiPageRevisionID "703834702".
• Absolute_configuration wikiPageWikiLink Alanine.
• Absolute_configuration wikiPageWikiLink Atom.
• Absolute_configuration wikiPageWikiLink Cahn–Ingold–Prelog_priority_rules.
• Absolute_configuration wikiPageWikiLink Category:Stereochemistry.
• Absolute_configuration wikiPageWikiLink Chemical_reaction.
• Absolute_configuration wikiPageWikiLink Chirality_(chemistry).
• Absolute_configuration wikiPageWikiLink Crystal.
• Absolute_configuration wikiPageWikiLink Dextrorotation_and_levorotation.
• Absolute_configuration wikiPageWikiLink Dispersion_(optics).
• Absolute_configuration wikiPageWikiLink EuFOD.
• Absolute_configuration wikiPageWikiLink Glyceraldehyde.
• Absolute_configuration wikiPageWikiLink Glyceric_acid.
• Absolute_configuration wikiPageWikiLink Glycine.
• Absolute_configuration wikiPageWikiLink International_Union_of_Pure_and_Applied_Chemistry.
• Absolute_configuration wikiPageWikiLink Isoserine.
• Absolute_configuration wikiPageWikiLink Johannes_Martin_Bijvoet.
• Absolute_configuration wikiPageWikiLink Lactic_acid.
• Absolute_configuration wikiPageWikiLink Mercury_oxide.
• Absolute_configuration wikiPageWikiLink Molecular_configuration.
• Absolute_configuration wikiPageWikiLink Molecular_entity.
• Absolute_configuration wikiPageWikiLink Nitric_acid.
• Absolute_configuration wikiPageWikiLink Optical_rotatory_dispersion.
• Absolute_configuration wikiPageWikiLink Proton_nuclear_magnetic_resonance.
• Absolute_configuration wikiPageWikiLink Resonant_scattering.
• Absolute_configuration wikiPageWikiLink Serine.
• Absolute_configuration wikiPageWikiLink Small_caps.
• Absolute_configuration wikiPageWikiLink Space_group.
• Absolute_configuration wikiPageWikiLink Stereochemistry.
• Absolute_configuration wikiPageWikiLink Tartrate.
• Absolute_configuration wikiPageWikiLink Ultraviolet-visible_spectroscopy_of_stereoisomers.
• Absolute_configuration wikiPageWikiLink X-ray_crystallography.
• Absolute_configuration wikiPageWikiLink Zinc.
• Absolute_configuration wikiPageWikiLink File:R_S_configuration.png.
• Absolute_configuration wikiPageWikiLink File:Relative_absolute_configuration.svg.
• Absolute_configuration wikiPageWikiLinkText "''R'' & ''S'' isomerism".
• Absolute_configuration wikiPageWikiLinkText "Absolute configuration".
• Absolute_configuration wikiPageWikiLinkText "absolute configuration".
• Absolute_configuration wikiPageWikiLinkText "absolute".
• Absolute_configuration wikiPageWikiLinkText "configured".
• Absolute_configuration wikiPageUsesTemplate Template:Cn.
• Absolute_configuration wikiPageUsesTemplate Template:Reflist.
• Absolute_configuration wikiPageUsesTemplate Template:Smallcaps_all.
• Absolute_configuration subject Category:Stereochemistry.
• Absolute_configuration type Redirect.
• Absolute_configuration comment "An absolute configuration in stereochemistry refers to the spatial arrangement of the atoms of a chiral molecular entity (or group) and its stereochemical description e.g. R or S, referring to Rectus, or Sinister, respectively.Absolute configurations for a chiral molecule (in pure form) are most often obtained by X-ray crystallography.".
• Absolute_configuration label "Absolute configuration".
• Absolute_configuration sameAs Q2052053.
• Absolute_configuration sameAs Configuration_absolue.
• Absolute_configuration sameAs Absolute_configuratie.
• Absolute_configuration sameAs Konfiguracja_absolutna.
• Absolute_configuration sameAs m.0266124.
• Absolute_configuration sameAs Q2052053.
• Absolute_configuration wasDerivedFrom Absolute_configuration?oldid=703834702.
• Absolute_configuration depiction R_S_configuration.png.
• Absolute_configuration isPrimaryTopicOf Absolute_configuration.