1996, Joseph C. Salamone, Polymeric Materials Encyclopedia, Twelve Volume Set[1], →ISBN, page 5201:
We believe the alkylamino radical is then the photoinitiator.
2010, W. Arthur Green, Industrial Photoinitiators: A Technical Guide[2], →ISBN, page 145:
The initial reaction under UV excitation produces a ketyl radical from the benzophenone, which is inactive, and an alkylamino radical from the tertiary amine, which is very reactive.
2013, D. F. Heath, Organophosphorus Poisons[3], →ISBN:
Compounds containing primary alkylamino groups are amongst these.