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A bis-NHC-CAAC dimer derived dicationic diradical

The isolation of carbon-centered diradicals is always challenging due to synthetic difficulties and their limited stability. Herein we report the synthesis of a trans -1,4-cyclohexylene bridged bis-NHC-CAAC dimer derived thermally stable dicationic diradical. The diradical character of this compound...

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Published in:Chemical science (Cambridge) 2022-11, Vol.13 (42), p.12533-12539
Main Authors: Nayak, Mithilesh Kumar, Sarkar, Pallavi, Elvers, Benedict J, Mehta, Sakshi, Zhang, Fangyuan, Chrysochos, Nicolas, Krummenacher, Ivo, Vijayakanth, Thangavel, Narayanan, Ramakirushnan Suriya, Dolai, Ramapada, Roy, Biswarup, Malik, Vishal, Rawat, Hemant, Mondal, Abhishake, Boomishankar, Ramamoorthy, Pati, Swapan K, Braunschweig, Holger, Schulzke, Carola, Ravat, Prince, Jana, Anukul
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Language:English
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Summary:The isolation of carbon-centered diradicals is always challenging due to synthetic difficulties and their limited stability. Herein we report the synthesis of a trans -1,4-cyclohexylene bridged bis-NHC-CAAC dimer derived thermally stable dicationic diradical. The diradical character of this compound was confirmed by EPR spectroscopy. The variable temperature EPR study suggests the singlet state to be marginally more stable than the triplet state (2 J = −5.5 cm −1 (Δ E ST = 0.065 kJ mol −1 )). The presence of the trans -1,4-cyclohexylene bridge is instrumental for the successful isolation of this dicationic diradical. Notably, in the case of ethylene or propylene bridged bis-NHC-CAAC dimers, the corresponding dicationic diradicals are transient and rearrange to hydrogen abstracted products. A dicationic diradical has been synthesized from the N,N′ - trans -1,4-cyclohexylene bridged bis-NHC-CAAC dimer.
ISSN:2041-6520
2041-6539
DOI:10.1039/d2sc03937k