Pyrocatechol 1.2- benzenediol

Alternative Names/Abbreviations 1,2-dihydroxybenzene, pyrocatechol, 1,2-benzenediol, pyrocatechin... 

D-Erythrose has also been exposed to a boiling solution in pH 4.5 buffer. Low yields (<0.2%) of a number of products were obtained, as shown in Scheme 3. These included 5-(hydroxymethyl)-2-furaldehyde (11), 2-acetyl-5-(hydroxymethyl)furan (12), 3,4-dihydroxyacetophenone (13), 3,4-dihydroxy be nzaldehyde (14), 3,4-dihydroxybenzoic acid (15), 2,3-dihydroxytoluene (16), and 1,2-benzenediol (pyrocatechol) (17). Also detected were formic, hydroxyacetic, and 3-hydroxypropanoic acids. Pyrocatechol seems to be a product formed from all carbohydrates boiled in aqueous solutions at pH 4-10 it may constitute a statistical product arising from retro-aldol and re-aldol reactions. It has been shown that the aldol reaction may operate at a pH as low as 4. An aldol reaction... 

The reaction mixture from acidified dihydroxyacetone also included a series of seven di- and tri-hydroxybenzenes (see Scheme 4), namely, 2,3-dihydroxytoluene (16), pyrocatechol (17), 3,4-dihydroxy toluene (19), 3,5-dimethyl-l,2-benzenediol (20), 1,2,3-trihydroxybenzene (pyrogallol) (21), 1,2,4-trihydroxy benzene (22), 3,4,5,6-tetrahydroxy-2-methy 1-acetophe-none, and 2,3-dihydroxy-5,6-dimethyl-p-benzoquinone. Many of these same phenolic compounds are present after hexoses are similarly treated... 

D-Erythrose undergoes self-aldolization in alkali solution, to form d- / co-L- /3 C6 TO-3-octulopyranose by combination of the 1,2-enediol and aldehyde forms. In weak alkali at 105°, syrupy D-erythrose yields d- /ycero-tetrulose, jS-D-a/tro-L-g/ycero-l-octulofuranose, and a-Ti-gluco-i -g/ycero-3-octulopyranose. At 300° in alkali, the major products from syrupy D-erythrose were 1-5% of butanedione (biacetyl) with smaller proportions of pyrocatechol, 33, 2,5-dimethyl-2,5-cyclohexadiene-l,4-dione (2,5-dimethylbenzoquinone), and 2,5-dimethyl-1,4-benzenediol (2,5-dimethylhydroquinone). It was assumed that D-erythrose is reduced to erythritol by a Cannizzaro type of reaction, followed by dehydration of erythritol to form biacetyl. However, very low proportions (<1%) of biacetyl are formed from erythritol compared with D-erythrose itself. Apparently, some other mechanism predominates in the formation of biacetyl. 

Chem. Abstr. Serv. Reg. No. 120-80-9 Chem. Abstr. Name 1,2-Benzenediol lUPAC Systematic Name Pyrocatechol Synonyms Catcchin 1,2-dihydroxybenzene... 

Pyridinylsulfonyl)aminophenyl]iodonium, inner salt, see (2-Pyridylsulfonyliminoiodo)benzene, 3387c Pyrocatecholato(2-)(quinolin-8-olato-/V, (9)-trioxygenido(2-)phosphorus, 3671 Pyrocatechol, see 1,2-Benzenediol, 2324 Pyrrole, 1462 f Pyrrolidine, 1648... 

Pyrocatechol, A-tert-butyl- (8) 1,2-Benzenediol, 4-(l,l,dimeth-ylethyl)-(9) (98-29-3)... 

Compounds in the water-insoluble liquid produced at around 600°C with current high value (greater than S2.00/kg) and commercial uses include vanillin and catechol (1,2-benzenediol, pyrocatechol). However these compounds are difficult to remove economically as discussed below and do have adhesive value. It is more feasible to remove catechol from the scrubber water as discussed below. 

Synonyms Pyrocatechol 4-(2-aminoethyl)pyro-catechol 3-hydroxytyramine 3,4-dihydroxyphen-ethylamine 4-(2-aminoethyl)-l,2-benzenediol Dopastat Intropin Chemical Formula CgHuNOa Representative Chemical Epinephrine Chemical Abstracts Service Registry Number CAS 51-43-4... 

H.23) (H.23) 1,2-Benzenediol, pyrocatechol, pyrocatechin, brenzcatechin , catechol (this name is also used for a tetrahydroxyflavanol), 1,2-dihydroxybenzene [120-80-9 ... 

SYNONYMS 1,2-benzenediol 2-hydroxyphenol o-benzenediol, catechin, o-dihydroxybenzene, pyrocatechol. 

Synonyms/Trade Names 1,2-Benzenediol o-Benzenediol 1,2-Dihydroxybenzene o-Dihydroxybenzene 2-Hydroxyphenol Pyrocatechol ... 

Phenols are more easily oxidized than alcohols, and a large number of inorganic oxidizing agents have been used for this purpose. The phenol oxidations that are of the most use to the organic chemist are those involving derivatives of 1,2-benzenediol (pyrocatechol) and 1,4-benzenediol (hydroquinone). Oxidation of compounds of this type with silver oxide or with chromic acid yields conjugated dicarbonyl compounds called quinones. 

Benzenediol. See Hydroquinone m-Benzenediol. See Resorcinol o-Benzenediol. See Pyrocatechol p-Benzenediol. See Hydroquinone... 

Other Names Pyrocatechol, 4-nitro- 1,2-Dihydroxy -nitrobenzene 3,4-Dihydroxy-1-nitrobenzene 3,4-Dihydroxynitrobenzene 4-Nitro-l,2-benzenediol 4-Nitro-l,2-dihydroxybenzene 4-Nitrobenzcatechin 4-Nitrocatechol 4-Nitropyrocatechol NSC 80651 p-Nitrocatechol CA Index Name 1,2-Benzenediol, 4-nitro-CAS Registry Number 3316-09-4 Merck Index Number Not listed Chemical Structure... 

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