| '''Catechol 2,3-dioxygenase''' ({{EC number|1.13.11.2}}, ''2,3-pyrocatechase'', ''catechol 2,3-oxygenase'', ''catechol oxygenase'', ''metapyrocatechase'', ''pyrocatechol 2,3-dioxygenase'') is an [[enzyme]] with system name ''catechol:oxygen 2,3-oxidoreductase (decyclizing)''.<ref>{{cite journal | title = Dioxygenation and spontaneous deamination of 2-aminobenzene sulphonic acid in ''Alcaligenes'' sp. strain ''O''-1 with subsequent meta ring cleavage and spontaneous desulphonation to 2-hydroxymuconic acid |author = Junker, F., Field, J.A., Bangerter, F., Ramsteiner, K., Kohler, H.-P., Joannou, C.L., Mason, J.R., Leisinger, T. and Cook, A.M. |journal = Biochem. J. |year = 1994 |volume = 300 |pages = 429–436 |pmid = 8002948 |pmc=1138180}}</ref><ref>{{cite journal | title = 3-Sulphocatechol dioxygenase and other dioxygenases (1.13.11.2 and 1.14.12.-) in the degradative pathways of 2-aminobenzenesulphonic, benzenesulphonic and 4-toluenesulphonic acids in ''Alcaligenes'' sp. strain ''O''-1 |author = Junker, F., Leisinger, T. and Cook, A.M. |journal = J. Gen. Microbiol. |year = 1994 |volume = 140 |pages = 1713–1722 |pmid = 8075807 |doi=10.1099/13500872-140-7-1713}}</ref><ref>{{cite book | chapter = Direct oxygenation by O<sub>2</sub>, oxygenases | title = The Enzymes |author = Hayaishi, O. |year = 1963 |volume = 8 |pages = 353–371 |editor = Boyer, P.D., Lardy, H. and Myrbäck, K. |edition = 2nd |publisher = Academic Press |location = New York }}</ref><ref>{{cite journal | title = Metapyrocatechase: a new catechol-cleaving enzyme |author = Kojima, Y., Itada, N. and Hayaishi, O. |journal = J. Biol. Chem. |year = 1961 |volume = 236 |pages = 2223–2228 |pmid = 13757654}}</ref><ref>{{cite journal | title = Metapyrocatechase. I. Purification, crystallization and some properties |author = Nozaki, M., Kagamiyama, H. and Hayaishi, O. |journal = Biochem. Z. |year = 1963 |volume = 338 |pages = 582–590 |pmid = 14087325}}</ref> This enzyme [[catalysis|catalyses]] the following [[chemical reaction]]
| |