Tris(trifluoromethyl) Cyclotriphosphine (CF₃P)₃: Formation and NMR Spectroscopy

Abstract

The reaction of trifluoromethyl dichlorophosphine (CF₃PCl₂) with mild reducing agents results in the formation of CF₃-substituted cyclooligophosphines (CF₃P) _n (n = 3–5). The hitherto unknown cyclotriphosphine (CF₃P)₃ is described here for the first time and is characterized by multinuclear (³¹P, ¹⁹F) NMR spectroscopy. A full analysis of the ¹⁹F NMR signals of (CF₃P)₃ (X and Y part of [AX₃]₂BY₃ spectrum) is presented.

Keywords:

• Cyclophosphanes
• fluorine
• NMR spectroscopy
• phosphorus
• trifluoromethyl

Dedicated to Professor Marian Mikołajczyk, CBMiM PAN in Łodź, Poland, on the occasion of his 70th birthday.

We thank Dr. Oliver Schön for a sample of CF₃PCl₂ and for his great help. Financial support from the Department of Chemistry and Biochemistry, Ludwig Maximilian University, is gratefully acknowledged. We thank Prof. Dr. T. M. Klapötke for many helpful discussions and for his continuous support.

Notes

^a The relative signs of the coupling constants result from the iterative fitting of the spectrum and are given assuming a negative sign for ¹ J _PP. ¹⁶

^a The relative signs of the coupling constants result from the iterative fitting of the spectrum and are given assuming a negative sign for ¹ J _PP. ¹⁶