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Volumn 133, Issue 28, 2011, Pages 10803-10816

Products and mechanism of acene dimerization. A computational study

Author keywords

[No Author keywords available]

Indexed keywords

ACTIVATION BARRIERS; BENZENE RING; CHARGE MOBILITIES; COMPUTATIONAL STUDIES; CYCLOADDITION REACTION; HIGH REACTIVITY; PENTACENES; POTENTIAL APPLICATIONS; REACTION MECHANISM; REACTION PATHWAYS; RING CLOSURES; TRANSITION STATE;

EID: 79960225383     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/ja106594v     Document Type: Article
Times cited : (111)

References (117)
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    • The calculated energy for anthracene dimerization at M06-2X/6-31G(d) without zero-point energy correction is -9.6 kcal/mol.
    • The calculated energy for anthracene dimerization at M06-2X/6-31G(d) without zero-point energy correction is -9.6 kcal/mol.
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    • At the M06-2X/6-31G(d) level, the restricted wave function is unstable for heptacene and longer acenes, whereas, at the B3LYP/6-31G(d) level, the restricted wave function is unstable (48) for hexacene and longer acenes.
    • At the M06-2X/6-31G(d) level, the restricted wave function is unstable for heptacene and longer acenes, whereas, at the B3LYP/6-31G(d) level, the restricted wave function is unstable (48) for hexacene and longer acenes.
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    • Since force constant calculations are not available for PBC-based calculations, zero-point energies for polymers cannot be calculated, and the energies reported in this section are without zero-point energy corrections.
    • Since force constant calculations are not available for PBC-based calculations, zero-point energies for polymers cannot be calculated, and the energies reported in this section are without zero-point energy corrections.
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    • Formation of acene-based polymers of similar types, as proposed here, was suggested from the photolysis of heptacene dimers by T. Fang in his Ph.D. thesis (performed under the supervision of Prof. O. L. Chapman); however, the obtained materials were very soluble in most organic solvents, whereas they are expected to be very insoluble.. Ph.D. Dissertation, University of California, Los Angeles, CA.
    • Formation of acene-based polymers of similar types, as proposed here, was suggested from the photolysis of heptacene dimers by T. Fang in his Ph.D. thesis (performed under the supervision of Prof. O. L. Chapman); however, the obtained materials were very soluble in most organic solvents, whereas they are expected to be very insoluble. Fang, T. Heptacene, Octacene, Nonacene, Supercene and Related Polymers. Ph.D. Dissertation, University of California, Los Angeles, CA, 1986.
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    • Detailed computational study of kinetics of the formation of acene-based polymers is currently underway.
    • Detailed computational study of kinetics of the formation of acene-based polymers is currently underway.
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    • 1 were obtained at UM06-2X/6-31G(d), while all other intermediates, TSs, and product were calculated at RM06-2X/6-31G(d).
    • 1 were obtained at UM06-2X/6-31G(d), while all other intermediates, TSs, and product were calculated at RM06-2X/6-31G(d).
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    • syn 1-4) that was found in the case of benzene dimerization.
    • syn 1-4) that was found in the case of benzene dimerization.
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    • It was suggested previously (;) that for Cope-type rearrangements "a nonconcerted reaction takes place when biradical intermediates are stabilized either by allyl or aromatic resonance". Anthracene and pentacene dimerizations, indeed, have a stabilized benzyl biradical intermediate and proceed via a nonconcerted pathway. However, for the dimerization of benzene and naphthalene, only a concerted pathway was found, even though the dimerization TSs have a stabilized allyl or benzyl biradical. We believe that this is because of the very high activation energies calculated for benzene and naphthalene dimerization
    • It was suggested previously (Navarro-Vázquez, A.; Prall, M.; Schreiner, P. R. Org. Lett. 2004, 6, 2981-2984) that for Cope-type rearrangements "a nonconcerted reaction takes place when biradical intermediates are stabilized either by allyl or aromatic resonance". Anthracene and pentacene dimerizations, indeed, have a stabilized benzyl biradical intermediate and proceed via a nonconcerted pathway. However, for the dimerization of benzene and naphthalene, only a concerted pathway was found, even though the dimerization TSs have a stabilized allyl or benzyl biradical. We believe that this is because of the very high activation energies calculated for benzene and naphthalene dimerization
    • (2004) Org. Lett. , vol.6 , pp. 2981-2984
    • Navarro-Vázquez, A.1    Prall, M.2    Schreiner, P.R.3


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.