Hatada, Koichi;
Ute, Koichi;
Nakano, Tamaki;
Vass, Frantisek;
Vogl, Otto
Haloaldehyde polymers, 34. 1H and 13C NMR spectra of chloral oligomers prepared by lithium tert‐butoxide initiation and the assignment of the meso/racemo addition products of the dimers
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Media type:
E-Article
Title:
Haloaldehyde polymers, 34. 1H and 13C NMR spectra of chloral oligomers prepared by lithium tert‐butoxide initiation and the assignment of the meso/racemo addition products of the dimers
Description:
<jats:title>Abstract</jats:title><jats:p><jats:sup>1</jats:sup>H and <jats:sup>13</jats:sup>C NMR spectra of the mixture of chloral oligomers prepared by initiation with lithium <jats:italic>tert</jats:italic>‐butoxide were examined in detail. <jats:sup>1</jats:sup>H and <jats:sup>13</jats:sup>C NMR signals due to meso and racemo diastereomers of the dimer fraction were unequivocally assigned through the <jats:sup>13</jats:sup>C‐<jats:sup>1</jats:sup>H COSY spectrum and the <jats:sup>13</jats:sup>C NMR spectra with low‐power selective <jats:sup>1</jats:sup>H‐decoupling. The two‐dimensional NOESY spectrum showed correlation peaks between the signals due to the methine (acetal) protons of the neighbouring chloral monomeric units of the most abundant isomers in the trimer and tetramer fractions. The <jats:sup>1</jats:sup>H NOE enhancements and <jats:sup>3</jats:sup><jats:italic>J</jats:italic><jats:sub>CH</jats:sub> coupling constants were measured for the dimers; the results confirmed the meso/racemo assignments based on earlier conformational analysis.</jats:p>