D 1907 (OTTO) Dimedone, GR 99%+ Cas 126-81-8 - used as catalysts in the formation of transition-metal complexes. D 1907 (OTTO) Dimedone, GR 99%+ Cas 126-81-8 - used as a catalyst in the formation of transition-metal complexes. Further, it is also employed in colorimetry, crystallography, luminescence and spectrophotometric analysis. In addition to this, it is used in the synthesis of naturally occurring fused 3-methylfurans.