Chem. [f. TRI- 5 + SULPHONE.] A compound in which carbon radicals are linked to other carbon radicals by the intervention of three SO2, groups, the sulphur atoms being directly joined to the carbon atoms; e.g., triethylsulphonemethylmethane, C(CH3)(SO2.C2H5)3; trisulphone acetone,

        (CH3)2C : {SO2—C(CH3)2}2 : SO2.
So Trisulphonic a., in trisulphonic acid, amide, chloride, etc., compounds of three SO2 . OH, SO2 . NH2, SO2 . Cl, etc., groups with a trivalent element or radical, the sulphur being directly joined to the element or carbon of the radical; e.g., amine-trisulphonic acid, N(SO2 . OH)3; benzene-trisulphonic acid, C6H3(SO2 . OH)3; benzene-trisulphonic chloride, C6H3(SO2Cl)3; Trisulphonate, a salt of a trisulphonic acid.

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1874.  Schorlemmer, Carbon Comp., 199. A series of sulphonic acids … substitution products of marsh gas,… the third is methenyltrisulphonic acid, CH(SO3H)3.

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1879.  Watts, Dict. Chem., VIII. I. 259. Benzenetrisulphonic acid, C6H3(SO3H)3 + 3 H2O, crystallises in long flat deliquescent needles.

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1886.  Jrnl. Chem. Soc., L. 623. Benzenetrisulphonic chloride melts at 184°; the amide melts at 306°. Ibid. (1892), LXII. 614. Attempts to prepare a tetrasulphone by the action of sodium on haloid trisulphones and of phenylthiochloride on trisulphonates [gave] negative results.

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