Direct access to 2-aryl substituted pyrrolinium salts for carbon centre based radicals without pyrrolidine-2-ylidene alias cyclic (alkyl)(amino) carbene (CAAC) as a …

D Mandal, S Sobottka, R Dolai, A Maiti, D Dhara… - Chemical …, 2019 - pubs.rsc.org
Chemical Science, 2019pubs.rsc.org
The synthesis of organic radicals is challenging due to their inherent instability. In recent
years, cyclic (alkyl)(amino) carbene (CAAC)-derived 2-substituted pyrrolinium salts have
been used as synthons for the synthesis of isolable carbon-based radicals. Herein, we
report a direct, easy and convenient method for the synthesis of 2-aryl substituted
pyrrolinium salts without using CAAC as a precursor. These cations can be reduced to the
corresponding radicals. The influence of the aryl substituent at the C-2 position on radical …
The synthesis of organic radicals is challenging due to their inherent instability. In recent years, cyclic(alkyl)(amino)carbene (CAAC)-derived 2-substituted pyrrolinium salts have been used as synthons for the synthesis of isolable carbon-based radicals. Herein, we report a direct, easy and convenient method for the synthesis of 2-aryl substituted pyrrolinium salts without using CAAC as a precursor. These cations can be reduced to the corresponding radicals. The influence of the aryl substituent at the C-2 position on radical stabilization and dimerization has been investigated. Because of the large scope of our strategy (capability to modulate different substituents at all the C- and N-centres of the pyrrolinium salts), it has the merit to be an extremely effective and productive route for generating carbon-based radicals whose stability as well as reactivity can be varied.
The Royal Society of Chemistry
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