ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
1H and 13C NMR spectra of the mixture of chloral oligomers prepared by initiation with lithium tert-butoxide were examined in detail. 1H and 13C NMR signals due to meso and racemo diastereomers of the dimer fraction were unequivocally assigned through the 13C-1H COSY spectrum and the 13C NMR spectra with low-power selective 1H-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 1H NOE enhancements and 3JCH coupling constants were measured for the dimers; the results confirmed the meso/racemo assignments based on earlier conformational analysis.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1989.021900922
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