Cleavage of N_pzCH₂-OP and unexpected formation of bis(3,5-dimethyl-1H-pyrazol-1-yl)methane (dmbpm): X-ray crystal structure of [PdCl₂(dmbpm)]

Abstract

In the reaction of (3,5-dimethyl-1H-pyrazol-1-yl)methyldiphenylphosphinite (dmpmp) with [PdCl₂(CH₃CN)₂], we have obtained hydrolysis and phosphorus oxidation products and the unexpected complex cis-[PdCl₂(dmbpm)] (dmbpm = bis(3,5-dimethyl-1H-pyrazol-1-yl)methane). Modifications in the synthesis of dmpmp (high temperature, strong base, and the presence of Ph₂P(O)Cl) show that dmbpm is a by-product from the synthetic route to dmpmp. The complex cis-[PdCl₂(dmbpm)] is isolated and fully characterized by mass spectrometry, analytical, and spectroscopy techniques and the crystal structure is obtained by X-ray diffraction methods.

Keywords:

• Poly(pyrazolyl) ligand
• Bond cleavage
• Palladium(II) complex
• X-ray diffraction

Acknowledgments

This article is dedicated to the memory of Prof Xavier Solans i Huguet. Support by the Spanish Ministerio de Educacion y Cultura (projecte CTQ2007-63913 BQU) is gratefully acknowledged.

Notes

**Deceased September 3rd, 2007.

Additional information

Notes on contributors

Xavier Solans**

**Deceased September 3rd, 2007.