The 1 H NMR spectrum of ampicillin in aqueous solution at pD 8 and 4 was assigned using a combination of 2D T-ROESY and 1D GOESY techniques. The Me-˛and Me-ˇchemical shift assignments, determined at pD 8, are opposite to existing literature values obtained under similar conditions. Additionally, the
A computer program for the automatic estimation of 1H NMR chemical shifts
✍ Scribed by Renate Bürgin Schaller; Ernö Pretsch
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 612 KB
- Volume
- 290
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A computer program has been developed for predicting 'H NMR chemical shifts. It automatically finds the various substructures of a given molecule for which additivity rules are available. Several strategies have been used to widen the range of applicability. With ,200 test compounds, over 90% of the assigned chemical shifts of protons bonded to a carbon atom could be predicted. The mean deviation between observed and predicted values was 0.08 ppm with a standard deviation of 0.19 ppm.
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