| Autor: |
Arshinova, R. P., Danilova, O. I., Arbuzov, B. A. |
| Zdroj: |
Phosphorus, Sulfur, and Silicon and the Related Elements; November 1987, Vol. 34 Issue: 1 p1-14, 14p |
| Abstrakt: |
The 13C and dynamic 1H NMR spectroscopy were employed to derive spectral tests for conformational studies of eight-membered phosphorus (PIII and PIV) containing heterocycles: 4,5; 7,8-dibenzo-(I) and dinaphto-(II) 1,3,2-dioxaphosphocines. Passing from series (I) to (II) causes a dramatic change in the shift difference of methylene protons at C-6. The geminal 2J(HH) and long-range 5J(PH) spin-spin couplings are determined by the ring structure. The latter is also influenced by the phosphorus valence state and the orientation of substituents at phosphorus. Fairly definite stereo-chemical assignments can be made using the nJ(31P13C) couplings with n of 2 to 5. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
|
