Crystalline, room-temperature stable phosphine–SO₂ adducts: generation of sulfur monoxide from sulfur dioxide

Abstract

The particularly basic phosphines 1a-c readily form isolable, zwitterionic Lewis base adducts with SO that were fully characterized including by X-ray diffraction studies. Computational and reactivity studies show that these adducts readily release SO at room temperature driven by the formation of the corresponding phosphine oxides.

Ultra‐High‐Molecular‐Weight Polymers Produced by the Immortal Phosphine‐Based Catalyst System

“…As a strong nucleophile superior than many organobases such as alkylphosphines and N ‐heterocyclic carbenes, organophosphorus(III) superbase, imidazolin‐2‐ylidenamino substituted phosphines (IAPs) are capable of capturing CO 2 and SO 2 molecules to form stable phosphine‐based adducts and activating extremely inert greenhouse gas sulfur hexafluoride . Although strong donor ability and easily adapted steric hindrance of IAPs should enpower them to be a very promising LB candidate for an FLP system, there has been no report on the employment of IAPs for LPP yet.…”

Tris(tetramethylguanidinyl)phosphine: The Simplest Non‐ionic Phosphorus Superbase and Strongly Donating Phosphine Ligand

“…While 6 is stable in the solid state for days, storing a solution of 6 in dichloromethane for 3 h results in a mixture of different products, including phosphine oxide 7, which suggests that sulfur monoxide is eliminated from the phosphine-SO 2 adduct (Figure S40). [7] To explore the potential of phosphine 1 in coordination chemistry, we synthesized the Rh(I) complex [Rh(1)(cod)Cl] (8), the Au(I) complex [Au(1)Cl] (9) and Pd(II) complex [Pd(1)(allyl)Cl] (10) from common metal precursors (Scheme 1). The complexes were formed selectively and isolated as (off)-white (9,10) or orange (8) solids in quantitative yield.…”

Pyridinylidenaminophosphines: Facile Access to Highly Electron‐Rich Phosphines

“…Recently, we discovered that the electron‐donating ability of phosphines can be significantly increased, beyond the range of N‐heterocyclic carbenes, by attaching up to three strong π‐donating imidazoline‐2‐ylidenamino substituents to the phosphorus atom . The resulting phosphines are promising ligands in catalysis and can activate and transform chemically rather inert species such as CO 2 or SF 6 …”