Sodium sulfite (sodium sulphite) is the inorganic compound with the chemical formula Na2SO3. A white, water-soluble solid, it is used commercially as an antioxidant and preservative. A heptahydrate is also known but it is less useful because of its greater susceptibility toward oxidation by air. The photochemical reaction of o-iodo- and o-bromophenol in an aqueous sodium sulfite solution proceeds via both nonchain and chain mechanisms. The formation of the intermediate product, aromatic radical anion, was observed. The quantum yield of the photochemical reaction of o-iodophenol increases, when the electron donor diphenylamine is irradiated. In the photolysis of o-halophenols in organic solvents, free iodine is evolved in addition to aromatic products. The products of the photolysis of o-iodophenol in ethanol and carbon tetrachloride were identified by gas chromatography-mass spectrometry. These are phenol in the case of ethanol and a mixture of o-chlorophenol and hydroxychloro-substituted biphenyls in the case of carbon tetrachloride. The quantum yields were determined for all photochemical reactions studied. The most common method for generation of alkane sulfonic acids is the reaction of alkyl bromides with sodium sulfite—the Strecker synthesis <1995COFGT (2) 113>. This approach has been reported for the preparation of ß-amino-ß-aryl-ethanesulfonic acids from the corresponding ß-aminopropyl bromides and sodium sulfite in water <1997AJC523>. The interesting biological activities of ß-aminoalkanesulfonic acids (taurine analogues) initiated synthesis of their derivatives such as hydroxysaclofen 66 <1995T11465> and ß-aminopropanesulfonic acids 67 <1996TL7319, 2002TA1129>. A mechanism for the chiral (R) - or (S) -2-aminoalkanesulfonic acid formation by reaction of the corresponding chiral aminoalcohol methanesulfonate with sodium sulfite was proposed by Xu and involves the intermediate aziridine<2002TA1129>. Diallylamine was converted into the cis- and trans-pyrrolidinesulfonates by cyclization with sodium hydrogen sulfite in an oxygen-assisted addition which is consistent with the mechanism of addition of bisulfite to alkenes.
photochemistry, electronic spectra, autoxidation, sodium sulfite, inorganic, reactions, mechanisms
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