- Waste water for processing heavy metal complexes of chelating agent [...] method for synthesizing double-
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The invention provides a synthesis method of a bis-sulfydryl chelating agent for processing heavy metal complex wastewater and particularly provides a synthesis method for 4-methyl-2-mercaptothiophenol. The 4-methyl-2-mercaptothiophenol is the chelating agent and is prepared from the following steps of: carrying out chlorosulfonylation on methyl thiophenol in a proper organic solvent to obtain 5-methyl-2-mercapto-benzenesulfonyl chloride, and carrying out reduction by utilizing a reducing agent, so as to obtain the 4-methyl-2-mercaptothiophenol. A product obtained by utilizing the method is easily separated and is high in yield.
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Paragraph 0018
(2017/03/14)
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- Reaction of thiols with 7-methylbenzopentathiepin
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Polysulfides typically react readily with thiols, thus, reactions of endogenous cellular thiols with the polysulfide linkage in naturally-occuring pentathiepin cytotoxins are likely to be an important aspect of their biological chemistry. Here, it is reported that the reaction of thiols with the pentathiepin ring system initially produces a complex mixture of polysulfides that further decomposes in the presence of excess thiol to yield the corresponding 1,2-benzenedithiol with concomitant production of H2S and dimerized thiol. In this reaction, a single molecule of the pentathiepin consumes approximately six equivalents of thiol. The reaction of thiols with the pentathiepin ring system is faster than the analogous reaction involving typical di- and trisulfides.
- Chatterji, Tonika,Gates, Kent S.
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p. 1349 - 1352
(2007/10/03)
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- Pesticidal compositions containing phosphoric esters and divalent sulphur compounds
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Pesticidal composition comprising: a pesticidal, phosphoric ester the molecule of which has at least one alkyl group of 1 to 3 carbon atoms, 0.05 to 10% of an agent stabilizing the said ester against decomposition by protonisation, together with adjuvants characterized in that the stabilizing agent comprises at least one sulphur compound containing per molecule at least one divalent sulphur atom of which one valence is bonded to an atom chosen from sulphur, carbon, nitrogen, hydrogen, and metals capable of giving a salt, the other valence being bonded to an atom chosen from hydrogen, the carbon atom already noted, a second carbon atom, the nitrogen atom already noted, a second nitrogen atom, the metal atom already noted in the case of a metal of valence greater than one, a second atom of metal and oxygen when the first valence is not attached to an atom of hydrogen, the proportion of sulphur calculated with reference to the weight of the sulphur compound being between 5 and 99%. Process for stabilizing a phosphoric ester of which the molecule possesses at least one alkyl group containing 1 to 3 carbon atoms characterized in that there is added to the phosphoric ester or to a mixture which contains it, 0.05 to 10% calculated on the weight of the phosphoric acid ester of an agent capable of stabilizing the said phosphoric ester against protonisation and comprising at least one sulphur compound such as that defined thereupon.
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