## Abstract ^31^P chemical shifts in __N__‐aryliminotriphenylphosphoranes and the corresponding __N__‐methylated phosphonium salts are presented. They can be correlated with those theories of the bonding in phosphorus‐nitrogen ylides which involve partial double bonding as a result of p^π^–d^π^ ove
19F and31p chemical shifts
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 47 KB
- Volume
- 7
- Category
- Article
- ISSN
- 1043-7347
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## Abstract The ^19^F chemical shifts of a series of bridgehead fluorides are reported. It is found that, contrary to earlier conclusions based on a limited number of substrates, the fluorine shifts occur randomly.
The isotope-induced chemical shifts 1 14/15 N( 31 P) were determined at natural abundance of 15 N by using HEED INEPT experiments. A dependence of 1 14/15 N( 31 P) on the substituents at nitrogen was found (alkyl < H < aryl; increasingly negative values). The magnitude and sign of the coupling const
## Abstract The signs and magnitudes of every fluorine–fluorine coupling constant in perfluoroquinoline (**1**), 2,4‐dichloropentafluoroquinoline (**2**) and 2‐bromohexafluoroquinoline (**3**) have been determined by ^19^F n.m.r. These provide an unambiguous assignment of the spectrum of the first