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. 2020 Feb 12;59(14):5577–5580. doi: 10.1002/anie.201915646

Scheme 1.

Scheme 1

1,1‐Ethenediol (1) generated from malonic acid (2) through pyrolysis and trapping in an argon matrix. Subsequent photorearrangement to acetic acid (3) and ketene (4). Biologically highly relevant enols (57).