Sterically hindered ortho-substituted phosphatriptycenes as configurationally stable P-chirogenic triarylphosphines

Lei Hu, Damien Mahaut, Nikolay Tumanov, Johan Wouters, Laurent Collard, Raphaël Robiette, Guillaume Berionni

Research output: Contribution to journalArticlepeer-review


ortho-Substituted and unsymmetrical 9-phospha-triptycenes were synthesizedviatwo synthetic approaches involving densely functionalizedortho-halogenated triarylmethane or phosphine precursors.ortho-Substituents imposed a considerable steric shielding due to the tricyclic cage-shaped structure with the aryl rings p-systems orthogonal to the phosphorus electron pair. A series of Au(i) and Rh(i) complexes were analysed in the solid state to determine Tolman electronic parameters, cone angles and buried volumes of these unprecedented functionalized phosphines. Quantum chemical calculations of electronic and steric descriptors revealed that these cage-shaped phosphines are electron-poor and that single methyl substituent is enough to provide the largest effect on steric shielding reported so far in triarylphosphines. An unsymmetrically substituted 9-phosphatriptycene was resolved by chiral HPLC, opening the avenue towards stableP-chirogenic triarylphosphines with unlimited configurational stability for new catalyst development in asymmetric transition-metal catalysis.

Original languageEnglish
Pages (from-to)4772-4777
Number of pages6
JournalDalton Transactions
Issue number14
Early online date15 Mar 2021
Publication statusPublished - 14 Apr 2021


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