https://www.thieme.de/en/thieme-chemistry/synform-nucleophilic-carbenes-derived-from-dichloromethane-174945.htm
Nucleophilic Carbenes Derived from Dichloromethane - Thieme Chemistry - Georg Thieme Verlag
Christopher Uyeda describes a method for the synthesis of nucleophilic carbenes.
nucleophiliccarbenesderiveddichloromethanethieme
https://carbene.de/
N-Heterocyclic Carbenes
nheterocyclic