Disodium sulfite

SYNS DISODIUM SULFITE EXSICATED SODIUM SULHTE NATRIUMSULFID (GERMAN) SODIUM SULFITE, anhydrous SODIUM SULPHITE SULFTECH SULFUROUS ACID, SODIUM SALT (1 2)... 

Alkyl and aryl tellurium trihalides with stabilizing electron-donor groups in the molecule that coordinate to the tellurium atom are not reduced by disodium sulfite or hypophosphorous acid" to ditellurium compounds but only to tellurium monohalides. 

Anhydrous sodium sulfite disodium sulfite exsiccated sodium sulfite E221 sulfutous acid disodium salt. 

Synonyms Anhydrous sodium sulfite Disodium sulfite Exsiccated sodium sulfite Sulftech Natriumsulfit (German) Sodium sulfite anhydrous Sodium sulphite Sulfurous acid Disodium salt Sodium salt (1 2)... 

DISODIUM SULFITE (7757-83-7) React with water, steam, or acids, forming corrosive acid solution and sulfur oxide fumes. Incompatible with oxidizers, lead diacetate, mercury(I) chloride, alkalis, ammonia, aliphatic amines, alkanolamines, alkylene oxides, amides, epichlorohydrin, organic anhydrides, isocyanates, vinyl acetate. 

Disodium sulfate. See Sodium sulfate Disodium sulfide. See Sodium sulfide Disodium sulfite. See Sodium sulfite Disodium 2-(4-sulfo-1-naphthylazo)-1-naphthol-4-sulfonate. See Acid red 14 Disodium 9-(sulfonatooxy) octadecanoate. See Sodium oleic sulfate Disodium 3,3 -[sulfonyl bis (2-nitro-4,1-... 

HjSOa, sulfurou acid SOj ", sulfite ion Na2S03, disodium sulfite, or sodium sulfite... 

A better procedure consists of addition of disodium sulfite (2 g 1.59 x lor mol) to lupulone (1.035 g 2.5 x 10 mol) or colupulone (1.0 g 2.5 x 10 mol) in MeOH (10 ml). The mixture is shaken in oxygen atmosphere until the gas absorption stops (2-3 h). After filtration and removal of the solvent, the residue (1.34 g) is extracted with warm hexane (2 x). The residual mixture of salts (1.05 g) is dissolved in MeOH and addified with HCI2 N. Dilution with H2O, extraction with hexane, removal of the solvent and distillation afford hulupone or cohulupone as yellow oils. 

Disodium sulfete. See Sodium sulfate Disodium sulfite. See Sodium sulfite... 

Another method employed is the treatment of aqueous solutions of aminophenols with activated carbon (81,82). During this procedure, sodium sulfite, sodium dithionite, or disodium ethylenediaminotetraacetate (82) is added to increase the quaUty and stabiUty of the products and to chelate heavy-metal ions that would catalyze oxidation. Addition of sodium dithionite, hydrazine (82), or sodium hydrosulfite (83) also is recommended during precipitation or crystallization of aminophenols. 

Benzenedisulfonic acid [831-59-4] (disodium salt), produced by the neutralization of the disulfonic acid with sodium sulfite [7757-83-7] is used in the manufacture of resorcinol [108-46-3] (1,3-benzenediol) (2), a chemical component found in mbber products and wood adhesives (72). The disodium salt is fused with sodium hydroxide, dissolved in water, and acidified to produce resorcinol, which is isolated via extraction (73). 

A common reaction sequence is shown in the schemes printed above. The sulfosuccinate monoesters are produced by a two-step reaction. In the first step 1 mol of maleic anhydride is reacted with a hydroxyl group-bearing component. In the second step the monoester is reacted with sodium sulfite (or sodium bisulfite) to form the disodium alkyl sulfosuccinate. At the so-called halfester stage, there are two possibilities for an electrophilic attack [61] (Michael-type reaction) at the double bond (Scheme 6). Reactivity differences between the two vinylic carbons should be very small, so that probably an exclusive formation of one single regioisomer can be excluded. 

Synthetically useful routes to dibenzo[c,e J[l,2]dithiins are normally based on cyclizations of biphenyI-2,2 -disulfonyl chlorides. A method applied successfully to the parent compound reduces the precursor with zinc in acetic acid to generate the bis thiol, which is then gently oxidized to the dithiin using iron(II) chloride (66HC(21-2)952). An alternative one-step reductive cyclization, which has been applied to the preparation of the 2,9- and 3,8-dinitro derivatives, involves reduction of the appropriate bis sulfonyl chlorides with hydriodic acid in acetic acid (68MI22600). Yet another reductive cyclization uses sodium sulfite followed by acidification, and these conditions lead to dibenzo[c,e][1,2]dithiin 5,5-dioxide. The first step of the reaction is reduction to the disodium salt of biphenyl-2,2 -disulfinic acid which, on acidification, forms the anhydride, i.e. dibenzo[c,e][l,2]dithiin 5,5,6-trioxide. This is not isolated, but is reduced by the medium to the 5,5-dioxide (77JOC3265). Derivatives of dibenzo[c,e] [1,2]dithiin in oxidation states other than those mentioned here are obtainable by appropriate oxidation or reduction reactions (see Section 2.26.3.1.4). 

A few additives have been tested in spray drying systems. Calcium chloride has proven effective in increasing the reactivity of limestone and Ca(0H)2 towards SO2 (10, 11). Adipic acid was also tested (12) with mixed results. Sodium sulfite, sodium hydroxide, Fe++ compounds, Ethylene-diamine-tetra-acetic-acetic acid and disodium salt (EDTA) have been used as additives during simultaneous SO2 and N0X removal (Niro Process) (13). The emphasis in the Niro process was to improve the removal of NOx. 

The capacity of the product is about 0.5 meq/g. Sulfomethylcellulose has been prepared by using monochloromethanesulfonate, made from dichloromethane and sodium sulfite. Phosphonomethylcellulose, a bifunctional cation exchanger, is prepared by reacting disodium chloromethyl-phosphonate and cellulose ... 

Sodium sulfite Sulfurous acid, disodium salt (7757-83-7), 76, 90... 

Generally, the reduction of aryl tellurium trihalides by a variety of reducing agents leads to diaryl ditellurium compounds. However, the reduction of aryl tellurium trihalides with stabilizing groups in the or//to-position to the tellurium atom, by sodium hydrogen sulfite, disodium disulfite, or hydrazine hydrate " to aryl tellurium halides shows that the reduction can be stopped at the tellurium halide stage. 

Nitrophenyl tellurium tribromide and 2-benzeneazophenyl tellurium trichloride were reduced to the aryl tellurium halide by sodium hydrogen sulfite , disodium disulfite, or hydrazine hydrate . 

Hydroxyethyl cellulose has good tolerance for dissolved electrolytes, although it may be salted out of solution when mixed with certain salt solutions. For example, the following salt solutions will precipitate a 10% w/v solution of Cellosize WP-09 and a 2% w/v solution of Cellosize WP-4400 sodium carbonate 50% and saturated solutions of aluminum sulfate ammonium sulfate chromic sulfate disodium phosphate magnesium sulfate potassium ferrocyanide sodium sulfate sodium sulfite sodium thiosulfate and zinc sulfate. 

Natrosol is soluble in most 10% salt solutions, excluding sodium carbonate and sodium sulfate, and many 50% salt solutions with the exception of the following aluminum sulfate ammonium sulfate diammonium phosphate disodium phosphate ferric chloride magnesium sulfate potassium ferrocyanide sodium metaborate sodium nitrate sodium sulfite trisodium phosphate and zinc sulfate. Natrosol 150 is generally more tolerant of dissolved salts than is Natrosol 250. 

Disodium disulfite disodium pyrosulfite disulfurous acid, disodium salt E223 natrii disulfis sodium acid sulfite sodium pyrosulfite. 

Blood lead levels provide the best indicators of lead poisoning but do not reflect total body burden (Lee and Moore 1990). The inhibition of erythrocyte 8-aminolevulinic acid indicates lead exposure, but most centers still use blood lead levels for screening (Lee and Moore 1990 Roper et al. 1993 Schaffer and Campbell 1994). Zinc protoporphyrin indicates neurotoxicity from lead but does not have the sensitivity for assessing low levels of exposure (Anger and Johnson 1985 Royce and Needleman 1995). Radiological examination of the abdomen and long bones does not reliably portray exposure. The same holds true for the examination of red blood cells for basophilic stippling and the assay of hair and nail levels for lead (Roper et al. 1993). The Centers for Disease Control and Prevention (CDC) does not recommend use of scarification of the forearm with 25% sodium sulfite solution to assess for black discoloration of skin, a procedure recommended in some sources. Medical centers perform an edetate disodium calcium provocative chelation test with urinalysis and complete blood... 

Amino-6-methylpteridin-4(3/7)-one (0.44 g, 2.5 mmol) was refluxed with a mixture of 2 M NaOH (2.5 mL) and HjO (10 mL). Then, over 36 h, 5% aq K.MnOt was added until the color of the solution changed from yellow to a light violet. The excess K.Mn04 was decolorized with sodium hydrogen sulfite, and the solution was filtered. The filtrate (about 40 mL) was treated with an equal volume of 10 M NaOH and after 24 h the yellow crystalline disodium salt product was collected, washed with LtOH, and dried at 100 C. The product was dissolved in 2 M NaOH, and acidified with 2 M HCI to give the free acid, which was washed with MeOH, and dried at 100"C yield 0.22 g (43%) yellow powder. 

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