13C and proton nuclear magnetic resonance spectra of trans-[arylbromobis(triethyl phosphine)palladium(II)] and related compounds. The π-donor ability of the Ni(PEt3)2X, Pd(PEt3)2X and Pt(PEt3)2X groups
✍ Scribed by Jaume Granell; Guillermo Muller; Mercè Rocamora; Jaume Vilarrasa
- Publisher
- John Wiley and Sons
- Year
- 1986
- Tongue
- English
- Weight
- 550 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
=C and proton NMR spectra of several arylpalladium and some arylnickel and arylplatinum complexes have been compared. The Ni(PEt&X and Pd(PEt,),X substituents induce a paramagnetic shift of C,,, (of the phenyl ring) which is much larger than that induced by Pt(PEt,),X. However, there are no significant differences along the NiIPdlPt series for the ortho, meta and para positions. For the six compounds of general formula trans-[ArPdBr(PEt3),] reported here, the mean A(&) values induced on the ArH by the introduction of the PdBr(PEt,), substituent are found to be 26.9 (Csp0), 7.2 (CoM,,J, -11 (Cme,a), -5.5 (C,,,), -0.03 (H,,I,,), -0.28 ( H m e m ) and -0.38 ppm