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The molecular structures of the minimum energy conformations of [8]- and [10]paracyclophanes (1) and (2) have been calculated by full gradient optimizations using the ab initio HF method with four Pople basis sets and by the DFT/B3LYP method with two split-valence basis sets under the constraint of assumed C2symmetry. The calculation for [8](1,4)naphthalenophane (3) was performed in the HF/6-31G*method in comparison to a force-field PIMM calculation. For each final geometry, 1H and 13C chemical shieldings have been calculated by theGIAOMOmethod and converted to chemical shifts by calculated TMSvalues for geometries optimized in the corresponding method/basis set combination. Compounds 1 to 3 have been synthesized by known procedures and their experimental NMR chemical shifts were measured at 400 MHz. 2D homo- and heteronuclear chemical shift correlations allow non arbitrary signal assignments. The calculated shift values have been correlated with experimental shifts by linear least squares regressions for proton and carbon NMR data. Best statistical parameters are obtained for 1H NMR values by HF/6-31G* calculations but for 13C NMR shifts from HF/6-311G* data. Surprisingly, regressions with our APUDI geometric factors lead to similar accuracy if the point dipoles are located at the carbon atom positions (p = 0.0 ) for both 1H and even 13C NMRvalues. These regressions show clearly that not only the 1HNMRdata but also 13C NMR values in the vicinity of a benzene ring are determined by a long range ring current anisotropy effect reproduced by the GIAO and the APUDI calculations.
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Tom
Strony
1159--1190
Opis fizyczny
Bibliogr. 78 poz., rys.
Twórcy
autor
autor
autor
autor
autor
autor
- Institute of Organic Chemistry at the University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany, guenter.haefelinger@uni-tuebingen.de
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Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUJ5-0014-0088
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