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This Review contains major "Stereochemistry"- related terms, short phrases and links grouped together in the form of Encyclopedia article.
- Stereochemistry, a subdiscipline of chemistry, involves the study of the relative spatial arrangement of atoms within molecules.
- Stereochemistry is simply the three-dimensional arrangement of a molecule.
- 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.
- Stereochemistry is particularly important in biochemistry and molecular biology.
- Stereochemistry is conveniently denoted in skeletal formulae: The different types of isomers.
- Alkane stereochemistry concerns the stereochemistry of linear alkanes and the linear alkane conformers.
- One of the principal synthetic difficulties is the generation of the correct stereochemistry at the C5 position of the molecule.
- The stereochemistry listed is relative stereochemistry unless otherwise noted.
- The Cahn-Ingold-Prelog system assigns the designations (S) and (R) to indicate the absolute stereochemistry of chiral molecules.
- Control of relative and absolute stereochemistry was derived from an easily accessible enantiomerically enriched propargylic alcohol 13.
- The relative stereochemistry of these products was confirmed by comparison with literature 1 H-NMR data.
- The scope of the two catalytic processes is discussed together with the factors that influence both relative and absolute stereochemistry.
- An important branch of stereochemistry is the study of chiral molecules.
- It is also possible for the stereochemistry of the reaction to be abnormal (or unexpected) when compared with a normal reaction.
- The absolute stereochemistry is related to L-glyceraldehyde, as was the case for triacylglycerides and phospholipids.
- The absolute stereochemistry was assigned only in the cases where direct comparison of the optical rotation with literature values was possible.
- The stereochemistry of dAdo adducts formed by reaction with BPDE or BPDCH depends on chloride concentration (Fig.
- A complete mechanism must also account for all reactants used, the function of a catalyst, stereochemistry, all products formed and the amount of each.
- The stereochemistry and yields of deoxyadenosine adducts were determined as a function of chloride concentration.
- Usually anomeric mixtures will be obtained and the stereochemistry formed at C-2 is heavily dependent upon the starting substrates.
- With compound 1 in hand we were now able to confirm the relative stereochemistry that was set in the hydrogenation of 2.
- Lastly, the stereochemistry of the central glycerol is inverted.
- Only the l -stereoisomer participates in the biosynthesis of proteins (see stereochemistry).
- Stereochemistry of protonation, in situ isomerization observed by 1 H NMR 3. Mechanistic considerations 4.
- One limitation relates to the stereochemistry of the product.
- Preferred compounds also include the 3,10-dibromo-8-chlorocompounds having R stereochemistry at the C-11 position.
- The physical and chemical differences between enantiomers and diastereomers are stressed throughout the study of stereochemistry.
- 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.
- Stereochemistry encompasses the study of stereoisomers and their properties.
- The stereochemistry of 4 has been elucidated whereas the formation of the methyl group from the methylene group remains to be established.
- The same rules that determine the stereochemistry of a stereocenter (R or S) also apply when assigning the face of a molecular group.
- The stereochemistry of pericyclic reactions is governed by the Woodward-Hoffmann rules and that of many elimination reactions by the Zaitsev's rule.
- This reaction gives the corresponding.alpha.-imino ester (compound 5-3a), with control over the stereochemistry of the.alpha.-carbon.
- The discussion again focuses on control of regiochemistry and stereochemistry of the condensation via the use of chair transition states.
- Perhaps just as important is the ability to control the relative stereochemistry at position 3.
- We know a great deal about the stereochemistry of organic molecules and this information may be considered as prior knowledge in the refinement process.
- General features of amino acids: stereochemistry, zwitterionic form at physiological pH. Properties of the individual amino acids.
- The stereochemistry of amino acids is also an important concept.
- In addition, if there are other stereocenters present in the starting material, they can influence the stereochemistry of the epoxidation relative to them.
- Presumably this reaction involves the formation of a bromonium ion intermediate, in which case the stereochemistry of the addition is anti.
- Using enantioenriched benzylic trifluoroborate salts leads to adducts with 98 % retention of stereochemistry in most cases.
- Some free radical versions of this reaction have been observed, these are not Diels-Alder reactions as the stereochemistry at the carbons is scrambled.
- In case of substituted alkene is very easy to observe the conservation of stereochemistry during reaction.
- 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.
- The relative stereochemistry of all compounds are noted using the R* or S* notation.
- 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.
- The stereochemistry of substituents attached to the tetracyclic systemA-D is stated by adding, or after the respective numerals denoting their position.
- The only difference between the two substituents is the stereochemistry of the alkene, so CIP rule 6 is used.
- Stereochemistry and mechanism of aliphatic nucleophilic substitution and elimination reactions.
- Discussion of advanced topics in stereochemistry and conformational analysis and organic reaction mechanisms.
- Organic synthesis, organometallic chemistry, stereochemistry, reaction mechanisms, asymmetric synthesis, and, more recently, molecular electronics.
- Knowledge of the properties of polyhedra is needed in crystallography and stereochemistry to determine the shapes of crystals and molecules.
- 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.
- Several methods exist to picture the three-dimensional arrangement of atoms in a molecule (stereochemistry).
- The stereochemistry of a molecule is important in many of the properties of the molecule.
- Wavy single bonds or crossed double bonds are both used to represent unknown or unspecified stereochemistry or a mixture of isomers.
- Alkane stereochemistry concerns the stereochemistry of alkanes.
- The science of determining the chirality of molecules in the laboratory is called stereochemistry 1.
- To mark two significant jubilees, the essay is dedicated to the role of chirality in stereochemistry.
- You see the primary carbon leaving group replaced with the nucleophile to give a compound with the same stereochemistry.
- In the +3 oxidation state, the stereochemistry of arsenic is affected by possession of a lone pair of electrons.
- Attack on the same side as the halogen would result in retention of stereochemistry.
- Attack from the opposite side to the halogen would result in inversion of stereochemistry.
- If the substrate under nucleophilic attack is chiral, this leads to an inversion of stereochemistry, called the Walden inversion.
- Preferably, methods of the present invention involve inversion of stereochemistry.
- The shapes ideally assumed by these intermediates becomes important when considering the stereochemistry of reactions in which they play a role.
- Encyclopedia of Keywords > Nature > Chemistry > Organic Chemistry
- Lone Pair
* Organic Chemistry
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