Results 61 to 70 of about 3,055,660 (264)

Nuclear shape coexistence : a study of the even-even Hg isotopes using the interacting boson model with configuration mixing [PDF]

open access: yes, 2014
Background: The Po, Pb, Hg, and Pt region is known for the presence of coexisting structures that correspond to different particle-hole configurations in the shell model language or equivalently to nuclear shapes with different deformation.
García-Ramos, JE, Heyde, Kristiaan
core   +1 more source

Investigating Absolute Stereochemical Configuration with Coulomb Explosion Imaging

open access: yesCHIMIA, 2018
It is a particularly challenging task in stereochemistry to determine the absolute configuration of chiral molecules, i.e. to assign to a given sample the microscopic enantiomeric structure.
Martin Pitzer   +4 more
doaj   +1 more source

Photoionization of the Ne-like Si4+ ion in ground and metastable states in the 110–184-eV photon energy range [PDF]

open access: yes, 2009
We present measurements of the absolute photoionization cross section of the neonlike Si4+ ion over the 110–184 eV photon energy range. The measurements were performed using two independent merged-beam setups at the super-ACO and ASTRID synchrotron ...
C. Blancard   +8 more
core   +1 more source

Absolute Configuration of Beer′s Bitter Compounds [PDF]

open access: yesAngewandte Chemie International Edition, 2012
The science and art of making beer, likely the oldest liquid fermented by humans, stretches over millennia. Production typically involves boiling beer wort together with hops, which acts as a natural preservative,1 but the generated iso-α-acids are known to be prone to decomposition,2, 3 and consequently, more stable reduced hops extracts, such as the ...
Urban, Jan   +3 more
openaire   +3 more sources

The Absolute Configuration of Sarkomycin.

open access: yesChemical and Pharmaceutical Bulletin, 1963
(+)-3-Oxocyclopentanecarboxylic acid was chemically correlated with (+)-3-carboxyadipic acid and with (+)-3-methylcyclopentanone, both of which are of known absolute configurations. This correlation established that the natural sarkomycin, (-)-2-methylene-3-oxocyclopentanecarboxylic acid, is represented by the formula (XXXII), of which C-1 is S.
Y, SATO   +3 more
openaire   +3 more sources

High resolution coherent population trapping on a single hole spin in a semiconductor [PDF]

open access: yes, 2013
We report high resolution coherent population trapping on a single hole spin in a semiconductor quantum dot. The absorption dip signifying the formation of a dark state exhibits an atomic physics-like dip width of just 10 MHz.
Brunner, Daniel   +8 more
core   +5 more sources

Crystal structure and absolute configuration of preaustinoid A1

open access: yesActa Crystallographica Section E: Crystallographic Communications, 2015
The absolute structure of the title compound preaustinoid A1 [systematic name: (5aR,7aS,8R,10S,12R,13aR,13bS)-methyl 10-hydroxy-5,5,7a,10,12,13b-hexamethyl-14-methylene-3,9,11-trioxohexadecahydro-8,12-methanocycloocta[3,4]benzo[1,2-c]oxepine-8 ...
Andrea Stierle   +2 more
doaj   +1 more source

Crystal structure of (R)-6-fluoro-2-[(S)-oxiran-2-yl]chroman

open access: yesActa Crystallographica Section E: Crystallographic Communications, 2015
The title compound, C11H11FO2, is a building block in the synthesis of the active pharmaceutical ingredient dl-nebivolol. The synthesis starting from the enantiomerically pure (R)-6-fluoro-4-oxo-3,4-dihydro-2H-chromene-2-carboxylic acid resulted in a ...
Yoann Rousselin   +2 more
doaj   +1 more source

The reflection invariance problems in stereochemical nomenclature for absolute configuration

open access: yesChemistry Teacher International, 2023
Genesis of chirality and its link to the origin of life continue to intrigue scientists. Chirality also plays an important role in medicine with the advent of chiral drugs and the consequent importance of asymmetric synthesis.
Bhattacharya Prabuddha, Basak Amit
doaj   +1 more source

Total synthesis and absolute configuration assignment of MRSA active garcinol and isogarcinol.

open access: yesChemistry, 2015
A short total synthesis of (±)-garcinol and (±)-isogarcinol, two endo-type B PPAPs with reported activity against methiciline resistant Staphylococcus aureus (MRSA), is presented.
C. Socolsky, B. Plietker
semanticscholar   +1 more source

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