Posts Tagged ‘Isomer’
Saturday, September 1st, 2018
I am exploring the fascinating diverse facets of a recently published laboratory experiment for undergraduate students.[1] Previously I looked at a possible mechanistic route for the reaction between an enal (a conjugated aldehyde-alkene) and benzyl chloride catalysed by base and a chiral amine, followed by the use of NMR coupling constants to assign relative stereochemistries. Here I take a look at some chiroptical techniques which can be used to assign absolute stereochemistries (configurations).
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References
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M. Meazza, A. Kowalczuk, S. Watkins, S. Holland, T.A. Logothetis, and R. Rios, "Organocatalytic Cyclopropanation of (E)-Dec-2-enal: Synthesis, Spectral Analysis and Mechanistic Understanding", Journal of Chemical Education, vol. 95, pp. 1832-1839, 2018. http://dx.doi.org/10.1021/acs.jchemed.7b00566
Tags:Absolute configuration, Biochemistry, bulk solutions, chemical transformations, Chemistry, Conformational isomerism, difficult energy difference, gas phase, higher energy forms, Interesting chemistry, Isomer, Isomerism, Nature, Physical organic chemistry, Polarization, spectroscopy, stereochemical product, Stereochemistry, Stereoisomerism, Vibrational circular dichroism
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Tuesday, February 9th, 2016
The phenomenon of bond stretch isomerism, two isomers of a compound differing predominantly in just one bond length, is one of those chemical concepts that wax and occasionally wane.[1] Here I explore such isomerism for the elements Ge, Sn and Pb.
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References
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J.A. Labinger, "Bond-stretch isomerism: a case study of a quiet controversy", Comptes Rendus. Chimie, vol. 5, pp. 235-244, 2002. http://dx.doi.org/10.1016/S1631-0748(02)01380-2
Tags:a Jahn-Teller, Bond length, chemical concepts, Chemical substance, Company: Ge, Coordination complex, energy, energy difference, Entertainment/Culture, Historical, Hydrogen bond, Isomer, Isomerism, Length, Molecular geometry, Organic chemistry, results of a search, search both bond stretch isomers, SN
Posted in crystal_structure_mining | 1 Comment »