Pd(PPh3)4 31P NMR data?

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Frank T. Edelmann

Dear Purnachandrarao Vasireddy, the 31P NMR resonance of Pd(PPh3)4 is observed at δ 29.8 ppm (see reference cited below). The paper is available on RG.

Article Self-Organization of Spherical, Core–Shell Palladium Aggrega...

Abdelkader BOUAZIZ

Dear all, according to the attached papers, the 31P NMR resonance of Pd(PPh3)4 is observed at δ 15.8 ppm. Is it the same signal mentionned by Prof. Frank T. Edelmann or there is something wrong my Regards

Dear Purnachandrarao Vasireddy and Abdelkader BOUAZIZ there are numerous articles in the literature describing the properties and uses of Pd(PPh3)4. Please find attached two more relevant papers. I assume that the different 31P NMR values are due to the dissociation of one or two triphenylphosphine ligands. Yet another factor could be that spectra were measured in different solvents.

Dear all, it is true Prof. Frank T. Edelmann, this catalyst is widely used in coupling reactions and is active only after the dissociation of one or two TPP molecules. It is nice to have all factors together in data analysis in order to come to correct conclusion. My Regards

Adel Amer

Vasireddy

I do agree with Edelmann who suggested the correct reference

Good luck

Imre Tóth

The chemical shift of Pd(PPh3)4 is indeed sensitive for the solvent due to the possible dissociations. But +29 ppm can maximum be accepted for Pd(PPh3)2, so the +16 ppm expected range for Pd(PPh3)4 is correct. It all goes about coordination shift! Remember even P(O)(PPh)3 comes around +26 ppm.