CHEM263 Lecture Notes - Nuclear Magnetic Resonance, Stereocenter, Stereoisomerism

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Primary, secondary, tertiary, and quaternary carbons are. Constitutional isomers (structural), stereoisomers: chair conformations, r/s nomenclature (cahn-ingold-prelog) There is only one carbon in this diagram that is a stereogenic center. In order to qualify as a stereogenic center, the atoms must be surrounded by 4. E (energy) = hv = hc/ h = planks constant (6. 62 x 10-34 m2*kg/s) v = frequency. = wavelength c = speed of light (3 x 108m/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": ex: 12c = 6 protons + 6 neutrons nuclear spin = 0, ex. 13c = 6 protons + 7 neutrons nuclear spin = +1/2: ex. 14c = 6 protons + 8 neutrons nuclear spin = 0. This carbon isotope is radioactive: note: only the number of neutrons in an atom can change.