Gaseous H,O, is sampled on a Ti(IV)-H,SO, coated filter, where titanium peroxy complex is formed. After sampling the filter is leached in a phosphate buffer (pH 7) and the peroxide concentration analysed spectrophotometrically at 505 nm after having added 4-(2-pyridylazohesorcinol (PAR). The triple
✦ LIBER ✦
An improved method for [5′-2H]-labelling 3′-O-acetylthymidine
✍ Scribed by John Orban; Brian R. Reid
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- French
- Weight
- 196 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0022-2135
No coin nor oath required. For personal study only.
✦ Synopsis
3'-0Acetylthymidine (I) was converted to the 0-acetoxy aldehyde (3) using a modified Swern oxidation procedure. The crude product was reduced with sodium borodeuteride to give, after chromatography, [5'-2H]-3'-CL-acety1thymidine (4) in 68% overall yield from -1. The extent of deuterium incorporation was >95% as judged by 'H NMR spectroscopy.
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