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- W1990815411 abstract "A simple, rapid, and quantitative NMR method was developed for the determination of the ratio of the diastereoisomers present in 7-chloro-3,3a-dihydro-2-methyl-2H,9H-isoxazolo(3,2-b)(1,3)benzoxazin-9-one (I). Deuterated tris(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedionato)europium III shift reagent causes the doublet assigned to the protons of the 2-methyl group, which normally appear at about 1.5 ppm, to split into a pair of doublets and shifts them downfield to about 3 ppm. Each new doublet represents one racemic diastereoisomeric pair present in I. The ratio of the pairs was determined by NMR integration of the areas under the respective doublets by calculating their proportions relative to the total area under the doublets. When a series of prepared mixtures of the isolated pairs was analyzed and their ratios were determined, the results obtained were within 1% of their actual values." @default.
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- W1990815411 date "1974-10-01" @default.
- W1990815411 modified "2023-09-23" @default.
- W1990815411 title "NMR assay of diastereoisomers of 7-chloro-3,3a-dihydro-2-methyl-2h, 9h- isoxazolo(3,2-b)(1,3)benzoxazin-9-one using deuterated tris(1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedionato)europium III shift reagent" @default.
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- W1990815411 doi "https://doi.org/10.1002/jps.2600631020" @default.
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