Key points are not available for this paper at this time.
Difluorocarbene derived from various carbene precursors could be effectively decomposed by 1,8-diazabicyclo5.4.0undec-7-ene (DBU). This decomposition process was successfully applied in the subsequent trifluoromethylation of a variety of (hetero)aryl iodides without the addition of an external fluoride ion. Mechanistic investigation revealed the detailed difluorocarbene conversion process in which the decomposed difluorocarbene is finally transformed into a fluoride ion and carbon monoxide.
Zheng et al. (2015) studied this question.