The past tense of trifluoromethylate is trifluoromethylated.
The third-person singular simple present indicative form of trifluoromethylate is trifluoromethylates.
The present participle of trifluoromethylate is trifluoromethylating.
The past participle of trifluoromethylate is trifluoromethylated.