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CHEM 263 (09/10/13) Nuclear Magnetic Resonance

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University of Alberta
John Vederas

CHEM 263 (September 10,2013) – Lecture Notes Nuclear Magnetic Resonance Things you should know:  Alkanes, alkenes, alkynes + nomenclature  What methyl, methylene, and methane are  Primary, secondary, tertiary, and quaternary carbons are  Concept of acids and bases  Constitutional isomers (structural), stereoisomers o Chair conformations o R/S Nomenclature (Cahn-Ingold-Prelog) Determining R/S Configurations  The nitrogen is not a stereocenter  There is only one carbon in this diagram that is a stereogenic center o In order to qualify as a stereogenic center, the atoms must be surrounded by 4 DIFFERENT groups  Based on priority:  Nuclear Magnetic Resonances Basic variables: E (energy) = hv = hc/λ -34 2 h = Planks constant (6.62 x 10 m *kg/s) v = frequency λ = wavelength c = speed of light (3 x 10 m/s)  Short wavelengths = higher energy = higher frequency  Long wavelengths = lower energy = lower frequency  If an atom has an odd number of protons and/or neutrons, it will have a ‘nuclear spin’ o Ex: C = 6 protons + 6 neutrons  Nuclear spin = 0 13 o Ex. C 146 protons + 7 neutrons  Nuclear spin = +1/2 o Ex. C = 6 protons + 8 neutrons  Nuclear spin = 0  This carbon isotope is radioactive o NOTE: Only the number of neutrons in an atom can change. The number of protons stays constant!
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