Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... The interaction of triflic anhydride with s-collidine in the presence of the (trimethylsilyl)enolether of acetophenone led to duplication products the structure of which could only be explained by the formation of CF 3 radicals. ... CF 3 radicals could be trapped by the (trimethylsilyl)enolether of ...