Phosphorus: coupling constants

Comparison of some calculated and experimental phosphorus coupling constants... 

A third electron is then transferred from the contact with the K—Na alloy, forming the paramagnetic radical trianion 67. The phosphorus coupling constant in 67 of dp = 4,6 was calculated from the ESR spectmm of 2.4.6-tris-pentadeutero-phenyl-X -phosphorin. 

Table 4.51. One-Bond (J and Longer-range (2J, 3J, 4J) Carbon-Phosphorus Coupling Constants of Representative Phosphines [372], Phosphonium Salts [365], Phosphine oxides [366, 372, 373], Phosphonium Ylides [365, 373], Phosphonates [368, 372], Phosphites [374], and Phosphates [375] (in Hz). 

IV. Phosphorus-Phosphorus Coupling Constants in Transition Metal Complexes. ... 

Phosphorus coupling constants in complexes of non-transition elements... 

IV. PHOSPHORUS-PHOSPHORUS COUPLING CONSTANTS IN TRANSITION METAL COMPLEXES... 

Situations (a) and (b) have been illustrated in Section II, and Table XI lists examples of phosphorus—phosphorus coupling constants obtained in this way. In Section (c), however, the situation is more complicated and will be discussed separately below. 

Phosphorus-phosphorus coupling constants of some tetrahedral nickel complexes... 

Analysis of the NMR spectra also leads to the evaluation of the phosphorus-phosphorus coupling constant and provides evidence concerning the relative signs of the directly bonded Vpp and the remote (Vpp or Vpp,) phosphorus-fluorine coupling constants (see Table IX). 

The NMR spectrum of the recently synthesized 1,3-ditertiary-butyl-2,4-difluorodiazadiphosphetidine (which is an XAA X spin system X = fluorine, A = phosphorus) has been analysed and the trans-annular phosphorus-phosphorus coupling constant found to be 92.5 Hz 260a). 

These represent [X A]2 or [X A]a spin systems [using the notation of Haigh (25)1 and the particular advantage of this type of system is that the phosphorus-phosphorus coupling constant (Jxa ) can be easily and accurately evaluated because this case, directly bonded... 

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