Issue 26, 2022

π-Delocalization in phosphaphthalimide and its ambident reactivity (O/P) toward main-group electrophiles

Abstract

The report on phosphaphthalimide (1), the phosphorus analogue of the phthalimide anion, dates back to forty years ago. However, the presence of π-delocalization between two-coordinated phosphorus centre and neighbouring carbonyl groups in 1 has been underestimated. Herein, sodium salts of 1 were obtained through a convenient procedure on a relatively large scale with a modified procedure. Reactivity studies demonstrated that 1 is indeed a good electrophile and the essential role of π-delocalization in 1 controlling its ambident properties. NBO analysis revealed the p–π conjugation and p–σ* hyperconjugation in 1 affecting its bond lengths in opposite ways.

Graphical abstract: π-Delocalization in phosphaphthalimide and its ambident reactivity (O/P) toward main-group electrophiles

Supplementary files

Article information

Article type
Paper
Submitted
14 Apr 2022
Accepted
03 Jun 2022
First published
07 Jun 2022

Dalton Trans., 2022,51, 10240-10248

π-Delocalization in phosphaphthalimide and its ambident reactivity (O/P) toward main-group electrophiles

Q. Shen, J. Xu and X. Chen, Dalton Trans., 2022, 51, 10240 DOI: 10.1039/D2DT01163H

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