The preparation of 1 7 0 -and 180-labelled hypophosphate by oxidation of diphosphite (P2-P4 acid) with iodine-water is described. The 162 MHz NMR 31P(18O) isotope shift of 1 8 0 -l a b e l l e d hypophosphate is 2.42 Hz (0.0149 ppm), the relatively large value compared to l\*O-pyrophosphate, 1.73 Hz
Photo-oxidation in the synthesis of17O and 18O labelled compounds: Synthesis of xanthone-18O1
✍ Scribed by Henry J. Pownall
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- French
- Weight
- 135 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0022-2135
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✦ Synopsis
Abstract
It it shown that the photo‐oxidation of aromatic molecules containing an active methylene group can be used to introduce isotopic oxygen. Photo‐oxidation of xanthene results in the formation of xanthone with the oxygen label appearing in the product at the carbonyl group. In this way, 100% enrichment can be realized. A brief discussion of other systems to which this method may be extended is also given.
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