| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1323970 | Journal of Organometallic Chemistry | 2011 | 6 Pages |
Two unsymmetrical PCN pincer Pd(II) complexes 3a–3b which are based on (pyrazolyl)aryl phosphinite ligands and contain two fused six-membered palladacycles have been synthesized from 3-(3,5-dimethylpyrazol-1-ylmethyl)benzyl alcohol (2) by one-pot phosphorylation/palladation reaction via C–H bond activation of the related ligands. The pyrazole-coordinated phosphine-free Pd(II) complex (4) was also isolated in the preparation of pincer complex 3a. The new complexes were characterized by elemental analysis, 1H NMR, 13C NMR, 31P {1H} NMR (for pincer complexes) and IR spectra. And the molecular structures of 3b and 4 have been further determined by X-ray single-crystal diffraction. The pincer Pd complexes 3a and 3b exhibited rather low activity in the allylation of benzaldehyde.
Graphical abstractTwo new unsymmetrical PCN pincer Pd(II) complexes 3a-3b with (pyrazolyl)aryl phosphinite ligands have been conveniently prepared. These new pincers contain two fused six-membered palladacycles and an X-ray single-crystal structure of 3b has been obtained. The two complexes exhibited rather low activity in the allylation of benzaldehyde.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Two new (pyrazolyl)aryl phosphinite PCN pincer Pd(II) complexes were prepared. ► They are unsymmetrical pincers and contain two fused six-membered palladacycles. ► An X-ray single-crystal structure of the new pincer complex has been obtained.
