Bis[3,4,6-trichloro-2-(pentyloxycarbonyl)phenyl] oxalate is a highly reactive peroxalate and can be used to detect H2O2 with fluorescent dyes[1].
[1]. Singh A, et al. Biolighted Nanotorch Capable of Systemic Self-Delivery and Diagnostic Imaging. ACS Nano. 2015 Oct 27;9(10):9906-11.
[2]. Kakino Ryuki, et al. Synthesis of Trifluoromethyl Ketones by Palladium-Catalyzed Cross-Coupling Reaction of Phenyl Trifluoroacetate with Organoboron Compounds. Bulletin of the Chemical Society of Japan. Volume 74, Issue 2.