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Related Experiment Video

Updated: Jun 30, 2025

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

Published on: November 22, 2016

Phosphaarsenes - Combining Phospha- and Arsa-Wittig-Reagents.

Henrik Beer¹, Jan-Erik Siewert¹, Mirjam Schröder^1,2

¹Leibniz-Institut für Katalyse (LIKAT), Albert-Einstein-Straße 29a, 18059, Rostock, Germany.

|March 15, 2024

Summary

New arsaphosphenes (RP=AsR') were synthesized by thermally treating mixtures of phosphorus and arsenic compounds. The study details the properties and reactivity of Mes*P=As^DipTer, revealing significant magnetic deshielding. This work expands the scope of dipnictene chemistry.

Keywords:

Arsaphosphenes N-Heterocyclic Carbenes Phosphorus Pnictinidene Transfer Solid-State NMR spectroscopy

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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

Published on: October 3, 2014

Area of Science:

Organometallic Chemistry
Main Group Chemistry
Inorganic Synthesis

Background:

Dipnictenes (RPnPnR) are dimers of pnictinidenes (R-Pn).
Phosphanylidene- and arsanylidenephosphoranes (R-Pn(PMe3)) serve as precursors for pnictinidene fragments.

Purpose of the Study:

To synthesize and characterize novel arsaphosphenes (RP=AsR").
To investigate the properties and reactivity of a specific arsaphosphene, Mes*P=As^DipTer.
To explore the magnetic shielding effects on the phosphorus atom in arsaphosphenes.

Main Methods:

Thermal treatment of 1:1 mixtures of R-P(PMe3) and R'-As(PMe3).
Solid-state 31P NMR spectroscopy.
Computational methods (e.g., DFT calculations).

Main Results:

Successful synthesis of three arsaphosphenes, including Mes*P=As^DipTer.
Observation of a large 31P NMR chemical shift anisotropy (ca. 920 ppm) for Mes*P=As^DipTer.
Computational studies elucidated the pronounced magnetic deshielding of the phosphorus atom.
Demonstration of Mes*P=As^DipTer's reactivity, splitting into NHC adducts.

Conclusions:

Arsaphosphenes can be accessed through thermal reactions of phosphanylidene- and arsanylidenephosphoranes.
The electronic structure of arsaphosphenes leads to significant magnetic deshielding at the phosphorus center.
These compounds exhibit interesting reactivity patterns, such as dissociation into pnictinidene fragments.