Several low molecular weight carboxylic acids with different substitutions were introduced into various polymer matrices: polypropylene, polystyrene, poly (butylene terephthalate) , MDI-based polyurethane, and poly (vinyl chloride). These acids were then submitted to chemical treatments by sulfur te
First Identification of a Steroid Carboxylic Acid in Petroleum
โ Scribed by Dr. Wolfgang K. Seifert; Dr. Emilio J. Gallegos; Dr. Richard M. Teeter
- Publisher
- John Wiley and Sons
- Year
- 1971
- Tongue
- English
- Weight
- 230 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0044-8249
No coin nor oath required. For personal study only.
โฆ Synopsis
band shifts. The apparent lack of coupling between H,H, and H,H, is surprising, but another example of this is known['1. The tabulated data are inconsistent with the presence of form B: cf.
It is estimated that any contribution from form B greater than 2% would have been detected. Analysis of the NMR spectrum of the corresponding 1,2-dicarboxylic acid (2) leads to a similar conclusion (see Table ).
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Metabolites of corticosteroids that contain the 2 1 -oic acid moiety are found in human urine. The acids from neutral steroids and urinary pigments have been separated by passing the mixture through a column of polyethyleneimine cellulose. The acids adhering to the column are quantitatively eluted w