Reactivity of Frustrated Lewis Pair: Carbocation versus Radical Intermediates

Recent reports of radical formation within frustrated Lewis pairs (FLPs) suggested that single‐electron transfer (SET) could play an important role in their chemistry especially for C−C coupling. In sharp contrast, our extensive dispersion‐corrected DFT calculations show that although reactive benzh...

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Published inChemistry : a European journal Vol. 30; no. 11; pp. e202303901 - n/a
Main Authors Qu, Zheng‐Wang, Zhu, Hui, Grimme, Stefan
Format Journal Article
LanguageEnglish
Published Germany Wiley Subscription Services, Inc 21.02.2024
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Abstract Recent reports of radical formation within frustrated Lewis pairs (FLPs) suggested that single‐electron transfer (SET) could play an important role in their chemistry especially for C−C coupling. In sharp contrast, our extensive dispersion‐corrected DFT calculations show that although reactive benzhydryl radical along with phosphine radical cation species can be kinetically generated from bulky phosphines and benzhydryl cation, direct P−C hetero‐coupling may lead to bulky phosphonium cation as reactive carbocation transfer reagents to styrene substrates, which is kinetically much more favorable than the recently proposed radical C−C coupling between benzhydryl radical and styrene. Similarly, meta‐stable radical cation Mes3P+⋅ salt is also kinetically accessible via SET reactions of Mes3P and B(C6F5)3 with 0.5 equivalent of p‐O2C6Cl4. Extensive DFT calculations show that both radical HCAr2⋅ and carbocation HCAr2+ are thermally accessible from the bulky phosphonium Mes3P−CHAr2+, which are further kinetically favored by HCAr2⋅ radical self‐dimerization and by nucleophilic alkene trapping, respectively.
AbstractList Recent reports of radical formation within frustrated Lewis pairs (FLPs) suggested that single-electron transfer (SET) could play an important role in their chemistry especially for C-C coupling. In sharp contrast, our extensive dispersion-corrected DFT calculations show that although reactive benzhydryl radical along with phosphine radical cation species can be kinetically generated from bulky phosphines and benzhydryl cation, direct P-C hetero-coupling may lead to bulky phosphonium cation as reactive carbocation transfer reagents to styrene substrates, which is kinetically much more favorable than the recently proposed radical C-C coupling between benzhydryl radical and styrene. Similarly, meta-stable radical cation Mes P ⋅ salt is also kinetically accessible via SET reactions of Mes P and B(C F ) with 0.5 equivalent of p-O C Cl .
Recent reports of radical formation within frustrated Lewis pairs (FLPs) suggested that single‐electron transfer (SET) could play an important role in their chemistry especially for C−C coupling. In sharp contrast, our extensive dispersion‐corrected DFT calculations show that although reactive benzhydryl radical along with phosphine radical cation species can be kinetically generated from bulky phosphines and benzhydryl cation, direct P−C hetero‐coupling may lead to bulky phosphonium cation as reactive carbocation transfer reagents to styrene substrates, which is kinetically much more favorable than the recently proposed radical C−C coupling between benzhydryl radical and styrene. Similarly, meta‐stable radical cation Mes3P+⋅ salt is also kinetically accessible via SET reactions of Mes3P and B(C6F5)3 with 0.5 equivalent of p‐O2C6Cl4.
Recent reports of radical formation within frustrated Lewis pairs (FLPs) suggested that single‐electron transfer (SET) could play an important role in their chemistry especially for C−C coupling. In sharp contrast, our extensive dispersion‐corrected DFT calculations show that although reactive benzhydryl radical along with phosphine radical cation species can be kinetically generated from bulky phosphines and benzhydryl cation, direct P−C hetero‐coupling may lead to bulky phosphonium cation as reactive carbocation transfer reagents to styrene substrates, which is kinetically much more favorable than the recently proposed radical C−C coupling between benzhydryl radical and styrene. Similarly, meta‐stable radical cation Mes 3 P + ⋅ salt is also kinetically accessible via SET reactions of Mes 3 P and B(C 6 F 5 ) 3 with 0.5 equivalent of p ‐O 2 C 6 Cl 4 .
Recent reports of radical formation within frustrated Lewis pairs (FLPs) suggested that single‐electron transfer (SET) could play an important role in their chemistry especially for C−C coupling. In sharp contrast, our extensive dispersion‐corrected DFT calculations show that although reactive benzhydryl radical along with phosphine radical cation species can be kinetically generated from bulky phosphines and benzhydryl cation, direct P−C hetero‐coupling may lead to bulky phosphonium cation as reactive carbocation transfer reagents to styrene substrates, which is kinetically much more favorable than the recently proposed radical C−C coupling between benzhydryl radical and styrene. Similarly, meta‐stable radical cation Mes3P+⋅ salt is also kinetically accessible via SET reactions of Mes3P and B(C6F5)3 with 0.5 equivalent of p‐O2C6Cl4. Extensive DFT calculations show that both radical HCAr2⋅ and carbocation HCAr2+ are thermally accessible from the bulky phosphonium Mes3P−CHAr2+, which are further kinetically favored by HCAr2⋅ radical self‐dimerization and by nucleophilic alkene trapping, respectively.
Recent reports of radical formation within frustrated Lewis pairs (FLPs) suggested that single-electron transfer (SET) could play an important role in their chemistry especially for C-C coupling. In sharp contrast, our extensive dispersion-corrected DFT calculations show that although reactive benzhydryl radical along with phosphine radical cation species can be kinetically generated from bulky phosphines and benzhydryl cation, direct P-C hetero-coupling may lead to bulky phosphonium cation as reactive carbocation transfer reagents to styrene substrates, which is kinetically much more favorable than the recently proposed radical C-C coupling between benzhydryl radical and styrene. Similarly, meta-stable radical cation Mes3 P+ ⋅ salt is also kinetically accessible via SET reactions of Mes3 P and B(C6 F5 )3 with 0.5 equivalent of p-O2 C6 Cl4 .Recent reports of radical formation within frustrated Lewis pairs (FLPs) suggested that single-electron transfer (SET) could play an important role in their chemistry especially for C-C coupling. In sharp contrast, our extensive dispersion-corrected DFT calculations show that although reactive benzhydryl radical along with phosphine radical cation species can be kinetically generated from bulky phosphines and benzhydryl cation, direct P-C hetero-coupling may lead to bulky phosphonium cation as reactive carbocation transfer reagents to styrene substrates, which is kinetically much more favorable than the recently proposed radical C-C coupling between benzhydryl radical and styrene. Similarly, meta-stable radical cation Mes3 P+ ⋅ salt is also kinetically accessible via SET reactions of Mes3 P and B(C6 F5 )3 with 0.5 equivalent of p-O2 C6 Cl4 .
Author Qu, Zheng‐Wang
Zhu, Hui
Grimme, Stefan
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Snippet Recent reports of radical formation within frustrated Lewis pairs (FLPs) suggested that single‐electron transfer (SET) could play an important role in their...
Recent reports of radical formation within frustrated Lewis pairs (FLPs) suggested that single-electron transfer (SET) could play an important role in their...
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SubjectTerms carbocation
Cations
Coupling
DFT calculations
Electron transfer
FLP
Intermediates
Phosphine
Phosphines
radical
reaction mechanism
Reagents
Styrene
Styrenes
Substrates
Title Reactivity of Frustrated Lewis Pair: Carbocation versus Radical Intermediates
URI https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fchem.202303901
https://www.ncbi.nlm.nih.gov/pubmed/38116858
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