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All calculations employed the cc-pVDZ basis set (Dunning, T. H. J. Cliem. Phys. 1989, 90, 1007). CASPT2 benzyne and naphthalyne calculations employed, respectively, 8-electron/8-orbital and 12-electron/ 12-orbital complete active space (CAS) wave functions as reference, at which levels geometries were optimized for all isomers and spin states. The active spaces were comprised of all π orbitals and the two nonbonding σ orbitals. BPW91 geometries for all isomers and spin states were verified as local minima by computation of analytic vibrational frequencies, which were also used to calculate zero-point vibrational energies.
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The Hartree-Fock (HF) level might also be indicated for single-reference calculations; however, since it fails to account for electron correlation, this level rarely provides accurate hfs predictions (see ref 41). Moreover, HF wave functions for aryl radicals can suffer from high degrees of spin contamination, making them poor reference configurations for post-HF methods that do account for correlation. These considerations make DFT the preferred method for the systems considered here.
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One might also, of course, develop the correlation for measured hfs values. However, in complicated aryl radicals one would expect measurement and assignment of the many coupling constants to be quite challenging, a complication that does not afflict the computational approach.
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