Absolute Configuration


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Absolute Configuration

A term of art referring to the arrangement of atoms around a molecule’s chiral centre.
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The observed sign of the E band at around 322 nm in the induced CD spectrum was correlated to the absolute configuration of the C-15 (or C-14) secondary alcohol moiety.
To determine the absolute configuration of C-9 in 1, (S)- and (R)-MTPA esters (1a and 1b) were prepared.
In 1973 when I began the synthesis of (S)-2, almost nothing was known about the absolute configuration of chiral and non-racemic pheromones, and it was not even clear whether enantiomeric composition would play a role at all in pheromonal communications.
Kita, "A novel determination method of the absolute configuration of 1-aryl-1-alkylalcohols and amines by an intramolecular CH/re shielding effect in 'H NMR," Tetrahedron Letters, vol.
In order to identify compound 1 unequivocally, its absolute configuration was investigated by circular dichroism.
In addition to bioassays, the absolute configuration of naturally occurring lamoxirene 1 in Undaria pinnatifida is confirmed by chiral gas chromatography.
of Siemens Industrial Automation Inc., Madison, Wis., rapidly and accurately analyzes crystalline materials, providing precise bond length and angle information, absolute configuration, and the arrangement of molecules within a crystal lattice, in addition to confirming the atomic connectivity and stereochemistry of the material.
For example, there is a table on isomerism and fluxionality, subdivided into eight categories such as recemization, absolute configuration, and linkage isomerism.
The modified Mosher method was tried to apply assigning the C-6 absolute configuration of 1.
Twenty-five chapters start off with a historical overview and then address such topics as electronic CD of benzene and other aromatic chromophores for determination of absolute configuration, electronic circular dichroism of supramolecular systems, protein-nucleic acid interactions, carbohydrates and glycoconjugates, and drug discovery.
Ten chapters discuss stereochemistry of molecules in inclusion crystals, torsional motion of Stilbene-type molecules in crystals, supramolecular networks of porphyrins, homo- and heterochirality in crystals, supramolecular synthesis of one-dimensional chains and two-dimensional layer in hydrogen bond networks of ureas and two-pyrimidinones, chiral auxiliaries powerful for both enantiomer resolution and determination of absolute configuration by x-ray crystallography, stereoselective thermal solid-state reactions, and other topics.