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Keywords:

  • Matrix isolation;
  • Ketenes;
  • Deltic acid

Abstract

Irradiation of squaric acid (4) in an argon matrix at 10 K leads to ethynediol (dihydroxyacetylene) (1) via bis (hydroxyketenyl) 5 and deltic acid (6). The identification of 1 is based on the comparison between the experimental and calculated IR spectrum.