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Structural effects on 17O NMR shifts of cyclic phosphine oxides

✍ Scribed by Louis D. Quin; Jerzy Szewczyk; Kathleen Linehan; David L. Harris

Publisher
John Wiley and Sons
Year
1987
Tongue
English
Weight
268 KB
Volume
25
Category
Article
ISSN
0749-1581

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✦ Synopsis

The 1 7 0 NMR chemical shifts of a variety of cyclic phosphine oxides were recorded at natural abundance. The shifts proved to be extremely sensitive to structural effects such as ring size and the presence of y-interactions. Values were found to cover a 70 ppm range. The most unusual effect was discovered with phosphine oxide groups in the 7-position of the norbornene framework. When the oxygen was anti to the double bond, exceptionally strong deshielding (by as much as 60 ppm) occurred relative to the isomer with syn oxygen. ''0 NMR clearly has value as a structural diagnostic technique with phosphine oxides.

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