CARBON-13 MAGNETIC RESONANCE .13. ASSIGNMENT OF CARBON-13 RESONANCES USING NUCLEAR OVERHAUSER EFFECT

The observed carbon-13 spectral intensities for the chemically nonequivalent quarternary carbon atoms in pyrene, acenaphthene, acenaphthylene, and fluoranthene enable assignment of these lines provided that the contributing nuclear Overhauser enhancement arises from the distance-dependent (r−6) dipolar interaction between the carbon and nearest neighbor protons. A semiquantitative model which emphasizes the geometrical dependence of these phenomena is provided. © 1969, American Chemical Society. All rights reserved.