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Enantiotopic groups are identical and indistinguishable except in chiral environments. For instance, the CH 2 hydrogens in ethanol (CH 3 CH 2 OH) are normally enantiotopic, but can be made different (diastereotopic) if combined with a chiral center, for instance by conversion to an ester of a chiral carboxylic acid such as lactic acid, or if coordinated to a chiral metal center, or if ...
One example is [Ru(NH 3) 5 (SMeEt)] 2+. The complex cis-VOCl 2 (SMeEt) 2 exists as meso- and a pair of enantiomers. [7] In complexes of thioethers of the type S(CH 2 R) 2 (R ≠ H), the methylene protons are diastereotopic. Examination of the NMR spectra of such complexes reveal that they undergo inversion at sulfur, without dissociation of the ...
Symmetrical norbornanes and similarly rigid compounds (e.g. 7-oxabicyclo[2.2.1]heptane) also show complex signals for the ethylene fragments, made more complicated by additional splitting by the bridgehead protons. Reich gives several additional examples of magnetic inequivalence in acyclic and cyclic systems containing H 2 C-CH 2 fragments. [3]
These are biblical figures unambiguously identified in contemporary sources according to scholarly consensus.Biblical figures that are identified in artifacts of questionable authenticity, for example the Jehoash Inscription and the bullae of Baruch ben Neriah, or who are mentioned in ancient but non-contemporary documents, such as David and Balaam, [n 1] are excluded from this list.
The Cone Nebula, sometimes referred to as the Jesus Christ Nebula because of its resemblance to the popular depictions of Jesus with his hands in a prayer position.. People have been found to perceive images with spiritual or religious themes or import, sometimes called iconoplasms or simulacra, in the shapes of natural phenomena.
Galindo-Uribarri and co-workers chose an isotope of neon with an energy structure that prevents it from emitting protons one at a time. This means the two protons are ejected simultaneously. The team fired a beam of fluorine ions at a proton-rich target to produce 18 Ne, which then decayed into oxygen and two protons. Any protons ejected from ...
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In Judaism, bible hermeneutics notably uses midrash, a Jewish method of interpreting the Hebrew Bible and the rules which structure the Jewish laws. [1] The early allegorizing trait in the interpretation of the Hebrew Bible figures prominently in the massive oeuvre of a prominent Hellenized Jew of Alexandria, Philo Judaeus, whose allegorical reading of the Septuagint synthesized the ...