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[21908-53-2] HgO (MW 216.59) InChI = 1S/Hg.O InChIKey = UKWHYYKOEPRTIC-UHFFFAOYSA-N (promotion of thio-Claisen rearrangement2; deprotection of dithianes, dithiolanes,3 thioorthoesters4; synthesis of tetrahydrofurans5; oxidizing agent6–18) Alternate Name: mercuric oxide. Physical Data: mp 500 °C (dec); d 11.14 g cm−3. Solubility: sol dilute HCl, HNO3; insol water, ethanol. Form Supplied in: commercially available in both yellow and red crystalline forms. Handling, Storage, and Precautions: highly toxic; oxidizer; protect from light.