Orthoacetic acid or ethane-1,1,1-triol is an hypothetical organic compound with formula C2H6O3 or H3C-C(OH)3.

It may have a fleeting existence in aqueous solutions of acetic acid.

[2] The three hydroxyls of CH3C(OH)3 could be deprotonated, leading successively to CH3C(OH)2(O–) (dihydrogenorthoacetate), CH3C(OH)(O–)2 (hydrogenorthoacetate), and finally CH3C(O–)3 (orthoacetate).

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