"In conclusion, it is obvious that N-heterocyclic carbenes and their unique, but concurrently versatile reactivity have already proven wide applicability. The offered catalytic (and enantioselective) access to important reactive intermediates suchas homoenolates or enolates as well as their additional catalytic properties will smooth the way for mild and sustainable synthesis of multifunctionalized compounds."
January 1, 1970
https://en.wikiquote.org/wiki/Persistent_carbene