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Making Aromatic Phosphorus Heterocycles More Basic and Nucleophilic: Synthesis, Characterization and Reactivity of the First Phosphinine Selenide
Author(s) -
Wossidlo Friedrich,
Frost Daniel S.,
Lin Jinxiong,
Coles Nathan T.,
Klimov Katrin,
Weber Manuela,
Böttcher Tobias,
Müller Christian
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202102390
Subject(s) - lone pair , selenide , chemistry , antibonding molecular orbital , nucleophile , reactivity (psychology) , natural bond orbital , medicinal chemistry , acceptor , selenium , photochemistry , computational chemistry , atomic orbital , organic chemistry , electron , molecule , catalysis , medicine , physics , alternative medicine , pathology , quantum mechanics , condensed matter physics
The synthesis and isolation of a phosphinine selenide was achieved for the first time by reacting red selenium with 2,6‐bis(trimethylsilyl)phosphinine. The rather large coupling constant of 1 J P,Se =883 Hz is in line with a P−Se bond of high s ‐character. The σ‐electron donating Me 3 Si‐substituents significantly increase the energy of the phosphorus lone pair and hence its basicity, making the heterocycle considerably more basic and nucleophilic than the unsubstituted phosphinine C 5 H 5 P, as confirmed by the calculated gas phase basicities. NBO calculations further reveal that the lone pairs of the selenium atom are stabilized through donor‐acceptor interactions with antibonding orbitals of the aromatic ring. The novel phosphinine selenide shows a distinct reactivity towards hexafluoro‐2‐butyne, Au(I)Cl as well as i PrOH. Our results pave the way for new perspectives in the chemistry of phosphorus in low coordination.