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  2. LCP theory - Wikipedia

    en.wikipedia.org/wiki/LCP_theory

    In LCP theory a lone pair is treated as a ligand. Gillespie terms the lone pair a lone pair domain and states that these lone pair domains push the ligands together until they reach the interligand distance predicted by the relevant inter-ligand radii. [1]

  3. Chiral drugs - Wikipedia

    en.wikipedia.org/wiki/Chiral_drugs

    Louis Pasteur - pioneering stereochemist. Chirality can be traced back to 1812, when physicist Jean-Baptiste Biot found out about a phenomenon called "optical activity." [10] Louis Pasteur, a famous student of Biot's, made a series of observations that led him to suggest that the optical activity of some substances is caused by their molecular asymmetry, which makes nonsuperimposable mirror ...

  4. Epimer - Wikipedia

    en.wikipedia.org/wiki/Epimer

    In stereochemistry, an epimer is one of a pair of diastereomers. [1] The two epimers have opposite configuration at only one stereogenic center out of at least two. [2] All other stereogenic centers in the molecules are the same in each. Epimerization is the interconversion of one epimer to the other epimer.

  5. Racemic mixture - Wikipedia

    en.wikipedia.org/wiki/Racemic_mixture

    One of the first such racemates studied, by Pasteur in 1853, forms from a 1:2 mixture of the bis ammonium salt of (+)-tartaric acid and the bis ammonium salt of (−)-malic acid in water. Re-investigated in 2008, [ 9 ] the crystals formed are dumbbell -shape with the central part consisting of ammonium (+)-bitartrate, whereas the outer parts ...

  6. Absolute configuration - Wikipedia

    en.wikipedia.org/wiki/Absolute_configuration

    COOH, R, NH 2 and H (where R is the side-chain) are arranged around the chiral center carbon atom. With the hydrogen atom away from the viewer, if the arrangement of the CO → R → N groups around the carbon atom as center is counter-clockwise, then it is the L form. [ 14 ]

  7. NYT ‘Connections’ Hints and Answers Today, Monday, December 2

    www.aol.com/nyt-connections-hints-answers-today...

    Get ready for all of today's NYT 'Connections’ hints and answers for #540 on Monday, December 2, 2024. Today's NYT Connections puzzle for Monday, December 2, 2024. The New York Times.

  8. Stereochemistry - Wikipedia

    en.wikipedia.org/wiki/Stereochemistry

    Stereochemistry, a subdiscipline of chemistry, studies the spatial arrangement of atoms that form the structure of molecules and their manipulation. [1] The study of stereochemistry focuses on the relationships between stereoisomers, which are defined as having the same molecular formula and sequence of bonded atoms (constitution) but differing in the geometric positioning of the atoms in space.

  9. Stereoisomerism - Wikipedia

    en.wikipedia.org/wiki/Stereoisomerism

    Traditionally, double bond stereochemistry was described as either cis (Latin, on this side) or trans (Latin, across), in reference to the relative position of substituents on either side of a double bond. A simple example of cis–trans isomerism is the 1,2-disubstituted ethenes, like the dichloroethene (C 2 H 2 Cl 2) isomers shown below. [7]