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Stereochemistry       Article     History   Tree Map
  Encyclopedia of Keywords > Nature > Chemistry > Organic Chemistry > Stereochemistry   Michael Charnine

Keywords and Sections
ALKANE STEREOCHEMISTRY CONCERNS
CORRECT STEREOCHEMISTRY
RELATIVE STEREOCHEMISTRY
ABSOLUTE STEREOCHEMISTRY
PRODUCTS
INFLUENCE
STUDY
POSSIBLE
CASE
CASES
FIG
FUNCTION
DEPENDENT
COMPOUND
INVERTED
PROTEINS
NMR
PRODUCT
PREFERRED COMPOUNDS
DIASTEREOMERS
STEREOISOMERS
METHYL GROUP
STEREOCENTER
ELIMINATION REACTIONS
CONTROL
ORGANIC MOLECULES
AMINO ACIDS
ADDITION
RETENTION
CARBONS
ALKENE
COMPOUNDS
INTERMEDIATES
SUBSTITUENTS
MECHANISM
MECHANISMS
MOLECULES
MOLECULE
ISOMERS
ALKANES
CHIRALITY
NUCLEOPHILE
LONE PAIR
RESULT
INVERSION
REACTIONS
Review of Short Phrases and Links

    This Review contains major "Stereochemistry"- related terms, short phrases and links grouped together in the form of Encyclopedia article.

Definitions

  1. Stereochemistry, a subdiscipline of chemistry, involves the study of the relative spatial arrangement of atoms within molecules.
  2. Stereochemistry is simply the three-dimensional arrangement of a molecule.
  3. Stereochemistry is not a branch of chemistry but rather a view at chemistry, as considered by E. L. Eliel; this approach is respected in the essay presented.
  4. Stereochemistry is particularly important in biochemistry and molecular biology.
  5. Stereochemistry is conveniently denoted in skeletal formulae: The different types of isomers.

Alkane Stereochemistry Concerns

  1. Alkane stereochemistry concerns the stereochemistry of linear alkanes and the linear alkane conformers.

Correct Stereochemistry

  1. One of the principal synthetic difficulties is the generation of the correct stereochemistry at the C5 position of the molecule.

Relative Stereochemistry

  1. The stereochemistry listed is relative stereochemistry unless otherwise noted.

Absolute Stereochemistry

  1. The Cahn-Ingold-Prelog system assigns the designations (S) and (R) to indicate the absolute stereochemistry of chiral molecules.
  2. Control of relative and absolute stereochemistry was derived from an easily accessible enantiomerically enriched propargylic alcohol 13.

Products

  1. The relative stereochemistry of these products was confirmed by comparison with literature 1 H-NMR data.

Influence

  1. The scope of the two catalytic processes is discussed together with the factors that influence both relative and absolute stereochemistry.

Study

  1. An important branch of stereochemistry is the study of chiral molecules.

Possible

  1. It is also possible for the stereochemistry of the reaction to be abnormal (or unexpected) when compared with a normal reaction.

Case

  1. The absolute stereochemistry is related to L-glyceraldehyde, as was the case for triacylglycerides and phospholipids.

Cases

  1. The absolute stereochemistry was assigned only in the cases where direct comparison of the optical rotation with literature values was possible.

Fig

  1. The stereochemistry of dAdo adducts formed by reaction with BPDE or BPDCH depends on chloride concentration (Fig.

Function

  1. A complete mechanism must also account for all reactants used, the function of a catalyst, stereochemistry, all products formed and the amount of each.
  2. The stereochemistry and yields of deoxyadenosine adducts were determined as a function of chloride concentration.

Dependent

  1. Usually anomeric mixtures will be obtained and the stereochemistry formed at C-2 is heavily dependent upon the starting substrates.

Compound

  1. With compound 1 in hand we were now able to confirm the relative stereochemistry that was set in the hydrogenation of 2.

Inverted

  1. Lastly, the stereochemistry of the central glycerol is inverted.

Proteins

  1. Only the l -stereoisomer participates in the biosynthesis of proteins (see stereochemistry).

Nmr

  1. Stereochemistry of protonation, in situ isomerization observed by 1 H NMR 3. Mechanistic considerations 4.

Product

  1. One limitation relates to the stereochemistry of the product.

Preferred Compounds

  1. Preferred compounds also include the 3,10-dibromo-8-chlorocompounds having R stereochemistry at the C-11 position.

Diastereomers

  1. The physical and chemical differences between enantiomers and diastereomers are stressed throughout the study of stereochemistry.
  2. SNF 4435 C and D are most likely diastereomers in which a single stereocenter (C-6) has the same absolute stereochemistry and the other four are inverted.

Stereoisomers

  1. Stereochemistry encompasses the study of stereoisomers and their properties.

Methyl Group

  1. The stereochemistry of 4 has been elucidated whereas the formation of the methyl group from the methylene group remains to be established.

Stereocenter

  1. The same rules that determine the stereochemistry of a stereocenter (R or S) also apply when assigning the face of a molecular group.

Elimination Reactions

  1. The stereochemistry of pericyclic reactions is governed by the Woodward-Hoffmann rules and that of many elimination reactions by the Zaitsev's rule.

Control

  1. This reaction gives the corresponding.alpha.-imino ester (compound 5-3a), with control over the stereochemistry of the.alpha.-carbon.
  2. The discussion again focuses on control of regiochemistry and stereochemistry of the condensation via the use of chair transition states.
  3. Perhaps just as important is the ability to control the relative stereochemistry at position 3.

Organic Molecules

  1. We know a great deal about the stereochemistry of organic molecules and this information may be considered as prior knowledge in the refinement process.

Amino Acids

  1. General features of amino acids: stereochemistry, zwitterionic form at physiological pH. Properties of the individual amino acids.
  2. The stereochemistry of amino acids is also an important concept.

Addition

  1. In addition, if there are other stereocenters present in the starting material, they can influence the stereochemistry of the epoxidation relative to them.
  2. Presumably this reaction involves the formation of a bromonium ion intermediate, in which case the stereochemistry of the addition is anti.

Retention

  1. Using enantioenriched benzylic trifluoroborate salts leads to adducts with 98 % retention of stereochemistry in most cases.

Carbons

  1. Some free radical versions of this reaction have been observed, these are not Diels-Alder reactions as the stereochemistry at the carbons is scrambled.

Alkene

  1. In case of substituted alkene is very easy to observe the conservation of stereochemistry during reaction.

Compounds

  1. All of these well-known aspects of the stereochemistry of the compounds of the formula I are considered to be part of the present invention.
  2. The relative stereochemistry of all compounds are noted using the R* or S* notation.

Intermediates

  1. The stereochemistry of the product 5 is due to the addition of the ylide 1 to the carbonyl 2 and to the ability of the intermediates to equilibrate.

Substituents

  1. The stereochemistry of substituents attached to the tetracyclic systemA-D is stated by adding, or after the respective numerals denoting their position.
  2. The only difference between the two substituents is the stereochemistry of the alkene, so CIP rule 6 is used.

Mechanism

  1. Stereochemistry and mechanism of aliphatic nucleophilic substitution and elimination reactions.

Mechanisms

  1. Discussion of advanced topics in stereochemistry and conformational analysis and organic reaction mechanisms.
  2. Organic synthesis, organometallic chemistry, stereochemistry, reaction mechanisms, asymmetric synthesis, and, more recently, molecular electronics.

Molecules

  1. Knowledge of the properties of polyhedra is needed in crystallography and stereochemistry to determine the shapes of crystals and molecules.

Molecule

  1. According to the stereochemistry, the O-N-H bonds of HAB should be coplanar with the benzene ring to keep the molecule at the lowest energy level (Fig.
  2. Several methods exist to picture the three-dimensional arrangement of atoms in a molecule (stereochemistry).
  3. The stereochemistry of a molecule is important in many of the properties of the molecule.

Isomers

  1. Wavy single bonds or crossed double bonds are both used to represent unknown or unspecified stereochemistry or a mixture of isomers.

Alkanes

  1. Alkane stereochemistry concerns the stereochemistry of alkanes.

Chirality

  1. The science of determining the chirality of molecules in the laboratory is called stereochemistry 1.
  2. To mark two significant jubilees, the essay is dedicated to the role of chirality in stereochemistry.

Nucleophile

  1. You see the primary carbon leaving group replaced with the nucleophile to give a compound with the same stereochemistry.

Lone Pair

  1. In the +3 oxidation state, the stereochemistry of arsenic is affected by possession of a lone pair of electrons.

Result

  1. Attack on the same side as the halogen would result in retention of stereochemistry.

Inversion

  1. Attack from the opposite side to the halogen would result in inversion of stereochemistry.
  2. If the substrate under nucleophilic attack is chiral, this leads to an inversion of stereochemistry, called the Walden inversion.
  3. Preferably, methods of the present invention involve inversion of stereochemistry.

Reactions

  1. The shapes ideally assumed by these intermediates becomes important when considering the stereochemistry of reactions in which they play a role.

Categories

  1. Encyclopedia of Keywords > Nature > Chemistry > Organic Chemistry
  2. Inversion
  3. Lone Pair
  4. Chirality
  5. Alkanes

Related Keywords

    * Organic Chemistry
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