Benzene sulfinic acid

The branching of the adduct decomposition was studied by measuring the pKa of the mixtures. Thus for pulse radiolysis of N20-saturated methyl phenyl sulfoxide the results yield a p/Ca obs value of 1.50 while the values for methane sulfinic and benzene sulfinic acids are 2.28 and 1.29, respectively. The fraction of each branch can be calculated from the equation,... 

For methyl phenyl sulfoxide it was found that 25% of the adduct decomposes to give phenyl radical and methane sulfinic acid, while 75% of the adduct leads to methyl radical and benzene sulfinic acid. For heavier alkyl groups the formation of the benzene sulfinic acid is even more dominant, 96% for R = Et and 100% for R = C2H4C1 or i-Pr. 

Benzene sulfinated by reaction with SO,. Benzene sulfinic acid CftH,- SOOH formed. 

Finally mixing of aliphatic or aromatic nitroso compounds with benzene sulfinic acid leads immediately to formation of benzene-sulfonylaminyloxides75. Aminyl-oxide anion 62 was detected when nitrosobenzene was allowed to react with aqueous hydrogensulfite in presence of lead dioxide76. With nitroso trifluoromethane radical 63 was formed. With tetraphenylarsonium cation this radical anion even formed a solid, paramagnetic precipitate77. ... 

Ethyl /m s -2-butenyl sulfone (86) together with some ethyl vinyl sulfone are obtained by the reaction of ethylene and. SO2 in wet benzene using PdCl2. SO2 behaves mechanistically similarly to CO in this reaction[66]. Hydrosulfination of alkenes with SO2 and H2 is catalyzed by the Pd(dppp) complex. The sulfinic acid 87 is a primary product, which reacts further to give the. S-alkyl alkanethiosulfonates 88 as the major product, and 89 and the sulfonic acid 90 as minor products[67]. 

US6303562 [66] comprising 2-(2-hydroxyphenyl)-benzene-sulfinate and alkyl-substituted derivatives thereof. enzyme having the amino acid sequence3 set forth in SEQ ID No. 2 or an enzymatically active fragment thereof. 

Sulfenyl chlorides react with zincalkyl (or -aryl) sulfinates and also with sodium benzene sulfinate to yield the corresponding esters of thiosulfonic acid 13, 111, 161) ... 

This crude material may be used directly in many preparations such as -acetaminobenzene sulfinic acid (p. 1). If a pure product is desired, the crude material is dried by pressing on a porous plate and then crystallized from dry benzene. The acid... 

General directions for preparation of sulfinic acids 498 500 Sulfur dioxide is led into a well cooled ethereal solution of the alkylmagnesium halide until no more precipitation occurs. After removal of the ether, the white crystalline residue of the magnesium sulfinate can be recrystallized directly from water, and the magnesium salts of ethane-, propane-, butane-, isopentane-, cyclohexane-, and benzene-sulfinite were prepared in this way magnesium 1-dodecanesulfinite501 was prepared at —35° to —40°. 

Benzene-, toluene-, and halobenzene-sulfinic acids, as well as sulfinobenzoic acids, amongst others, have been prepared by this procedure. 

Knoevenagel and Polack733 have given directions for the preparation of aromatic sulfinic anhydrides by the action of acetic anhydride on a suspension of the dry sulfinic acid in a little acetic acid. The reaction is catalysed by sulfuric acid or a 0.1% solution of iron(m) chloride in glacial acetic acid or acetic anhydride. Benzene-, / -toluene-, / -xylene-, pseudocumene-, mesitylene-, and / -bromo- and / -iodo-benzene-sulfinic anhydride have been obtained in this way. 

The intramolecular diene coupling with trapping by sulfinic acid has also been shown to be viableBisdiene 117 is trapped by p-toluenesulfinic acid (0.05 [Pd(OAc>2/2 PhjP], benzene, 70 °C) to afford allylic sulfone 118 in moderate yield (50%, 13 1 trans/cis ring substitution). 

N,N -Ditosyl-(3-phenyl-2-propene)sulfinic acid amidine refluxed 15 min. in benzene N-(l-phenyl-2-propenyl)-N,N -thiobis-(p-toluenesulfonamide). Y ca. 100%. F. e. s. N. Schonberger and G. Kresze, A. 1975, 1725. 

In contrast to the sulfinic and carboxylic acids, the sulfonic acids are very highly ionized. As might be expected from their structure, they are fairly soluble in water and the lower members are therefore isolated usually in the form of salts. Many sulfonic acids may be hydrolyzed by heating with 25 per cent to 50 per cent sulfuric acid to yield the corresponding hydrocarbons or derivatives. The ease of hydrolysis differs with different members, and it appears that those compounds which are sulfonated most readily yield sulfonic acids which hydrolyze the most easily. Benzene sulfonic acid does not yield benzene except under special... 

Salts of sulfinic acids, especially benzene sulfinites, are easily alkylated by primary and secondary benzyl halides and by alkyl sulfates to sulfbnes. 

Rhodococcus sp. Strain T09 A Rhodococcus strain T09 was isolated by enrichment on media-containing BT. The desulfurization mechanism of this organism was reported to be similar to Gordonia sp. 213E due to the observation of similar intermediates however, the substrate specificity was different. The strain T09 could use 2-methyl, 3-methyl and 5-methyl BT apart from BT as sole source of sulfur for growth, but not 7-methyl or ethyl derivatives. Additionally, it could also use methyl thiobenzothiazole, marcaptobenzothiazole, as well as benzene sulfide, benzene sulfonate, biphenyl sulfinate, dimethyl sulfate, dimethyl sulfone, dimethyl sulfide, methane sulfonic acid, thiophene, and taurine as sole sulfur sources. However, it could not grow on DBT or DBT sulfone. 

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