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1866 H. Watts Dict. Chem. IV. 763 With pentachloride of phosphorus it [sc. pyromucic acid] yields chloride of pyromucyl, C⁵H³O²Cl.

1923 Jrnl. Amer. Chem. Soc. 45 520 A new sample (1 g.) of pyromucyl-hydroxamic acid was dissolved in ethyl acetate as before.

1948 Obituary Notices Fellows Royal Soc. 5 709 The introduction of a cyclic group such as benzoyl, toluyl, pyromucyl, or phenacetyl in near proximity to an asymmetric carbon atom.