A bis-NHC–CAAC dimer derived dicationic diradical. Issue 42 (19th October 2022)

• Record Type: Journal Article
• 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
• Is Part Of: Chemical science. Volume 13:Issue 42(2022)
• Page Start: 12533
• Page End: 12539
• Publication Date: 2022-10-19
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2sc03937k
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : A dicationic diradical has been synthesized from the N, N′ - trans -1, 4-cyclohexylene bridged bis-NHC–CAAC dimer. Abstract : 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.