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Experimental work on TMM has been reviewed by:, Borden, W. T, Ed, Wiley-Interscience: New York
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A diaza derivative of 4 has also been generated: Platz, M. S.; Carrol, G.; Pierrat, F.; Zayas, J.; Auster, S. Tetrahedron 1982, 38, 777.
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(b) A diaza derivative of 4 has also been generated: Platz, M. S.; Carrol, G.; Pierrat, F.; Zayas, J.; Auster, S. Tetrahedron 1982, 38, 777.
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(j) Hrovat, D. A.; Borden, W. T., results tabulated by: Bally, T.; Borden, W. T. In Reviews in Computational Chemistry; Lipkowitz, K. B., Boyd, D. B., Eds.; VCH: New York, 1998; 1-99.
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33751323829
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The CASPT2 results for 3 in Table 3 of the Review in ref 11j differ slightly from those in Table 1 of this paper, because the former were obtained with IPEA shift = 0.0 in MOLCAS, whereas the latter were obtained with IPEA shift = 0.25. (1) Brabec, J.; Pittner, J. J. Phys. Chem. A 2006, 110, 11765.
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(k) The CASPT2 results for 3 in Table 3 of the Review in ref 11j differ slightly from those in Table 1 of this paper, because the former were obtained with IPEA shift = 0.0 in MOLCAS, whereas the latter were obtained with IPEA shift = 0.25. (1) Brabec, J.; Pittner, J. J. Phys. Chem. A 2006, 110, 11765.
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0000502494
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2 states of 4 have been published: Datta, S. N.; Jha, P. P.; Ali, Md. E. J. Phys. Chem. A 2004, 108, 4087. However, a singlet diradical cannot be properly represented by a wave function consisting of a single configuration.
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2 states of 4 have been published: Datta, S. N.; Jha, P. P.; Ali, Md. E. J. Phys. Chem. A 2004, 108, 4087. However, a singlet diradical cannot be properly represented by a wave function consisting of a single configuration.
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61749092887
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The CASSCF optimized geometries and the CASSCF and CASPT2 energies are available in the Supporting Information for this paper.
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The CASSCF optimized geometries and the CASSCF and CASPT2 energies are available in the Supporting Information for this paper.
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61749086279
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MOLCAS, Version 6.4
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MOLCAS, Version 6.4:
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0141991885
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Karlstrøm, G.; Lindh, R.; Malmqvist, P.-Å.; Roos, B. O.; Ryde, U.; Veryazov, V.; Widmark, P.-O.; Cossi, M.; Schimmelpfennig, B.; Neogrady, P.; Seijo, L. Comput. Mater. Sci. 2003, 28, 222.
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Karlstrøm, G.1
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Widmark, P.-O.7
Cossi, M.8
Schimmelpfennig, B.9
Neogrady, P.10
Seijo, L.11
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61749096047
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Since the NBMOs of the 1B1 states of 2 and 3 are disjoint, 3B1 is calculated to lie below 1B1 by only a few tenths of a kcal/mol in both diradicals. Consequently, like the energies of the twisted 1B1 states, the energies of the twisted 3B1 states, relative to the planar 3B2 states, are calculated to be nearly the same in 2 and 3. Therefore, the energies required to twist a methylene group out of conjugation are nearly the same in the 3B 2 states of both diradicals. Given the very similar bond lengths between the central carbons and the methylene groups in the planar, 3B2, ground states of 2 and 3, this finding is not at all surprising
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2, ground states of 2 and 3, this finding is not at all surprising.
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2 NBMO.
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2 NBMO.
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1 the ground state of 1,3-benzoquinodimethane was proposed by: West, A. P., Jr.; Silverman, S. K.; Dougherty, D. A. J. Am. Chem. Soc. 1996, 118, 1452.
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1 the ground state of 1,3-benzoquinodimethane was proposed by: West, A. P., Jr.; Silverman, S. K.; Dougherty, D. A. J. Am. Chem. Soc. 1996, 118, 1452.
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0001450295
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Li, J.; Worthington, S. E.; Cramer, C. J. J. Chem. Soc., Perkin Trans. 2 1998, 1045.
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Li, J.1
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(a) Davidson, E. R.; Borden, W. T.; Smith, J. J. Am. Chem. Soc. 1978, 100, 3299.
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Davidson, E.R.1
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Smith, J.3
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Our (6/6)CASSCF/6-31G(d) calculations place the 1Ag and 1B2u states of 6 respectively 19.8 and 27.1 kcal/mol above the 3B2u ground state
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2u ground state.
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42
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61749097317
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Inclusion of dynamic electron correlation by CASPT2 reduces the CASSCF energy differences to 18.0 and 18.6 kcal/mol.
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(c) Inclusion of dynamic electron correlation by CASPT2 reduces the CASSCF energy differences to 18.0 and 18.6 kcal/mol.
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