Disulphones synthesis

Naphthylamine-5,7-disulphonic acid and 2-naphthylamine-l-sulphonic acid, which are intermediate products in Scheme 4.28, as well as 2-naphthylamine-l,5-disulphonic acid (obtained by careful low-temperature sulphonation of Tobias acid), are all used in the synthesis of azo dyes. 

Condensation of a diphenylmethanol derivative, such as Michler s hydrol (6.159), with a reactive aryl component under acid conditions (the hydrol synthesis) also provides a leuco base. The dye 6.163 (Cl Acid Green 50) is made by reacting Michler s hydrol with R acid (2-naphthol-3,6-disulphonic acid) and oxidising the resulting leuco compound (Scheme 6.30). 

A general synthesis of 3,6-disulphonated 4-aminonaphtl limides (108), the Lucifer Yellow dyes, is... 

Harrison WL, Hickner MA, Kim YS, MaGrath JE (2005) Poly(arylene ether sulphone) copolymers and related systems from disulphonated monomer building blocks synthesis, characterization and performance—a topical review. Fuel Cells 5 201-212... 

Vninonaphthalene-1,7-disulphonic acid EINECS 201-629-5 1-Naphthylamine-4,6-disulfonic acid 1,7-Naphthalenedisulfonlc acid, 4-amino-. Intermediate in synthesis of dyestuffs. Readily soluble in H2O, Eton... 

A range of mono- and di-anhydro-inositols have been prepared from the isomeric 3,6-dibromocyclohexadienemono-epoxides (6) by conventional transformations via the corresponding anhydroconduritols (7). Another paper reports the synthesis of all the 1,2,3,4- and 1,2,4,5-dianhydro-inositols from inositol disulphonates using sodium methoxide. The hydration of three inososes... 

Ghorbani VR, Flajinazari S (2013) Poly-(Af, Af-dibromo-Af-ethyl-benzene-l,3-disulphon-amide) and A(jV, A-tetrabromobenzene-l,3-disulphonamide as novel eatalysts for synthesis of quinoxaline derivatives. J Chem Sci 125 353-358... 

Weasels C1963) reported the suppression of inhibition of cyclic phosphorylation with FMS by DCHU when ascorbate and NADPH were added. The inhibition of phosphorylation with vitamin and anthraquinone disulphonate by DCMU could not be overcome by ascorbate but the addition of small amounts of DCFIF and ascorbate reinitiated ATP synthesis. (Fig. 3.2). Friend et al C1966) found that AA and indophenol dye reduced some plastoquinones in darkness and even under illumi nation but in the presence of DCMU. 

Long-established methods for synthesis of thiols for which modified procedures have been worked out include the use of Naj SSOs for the synthesis of S-labelled thiols from alkyl bromides, the use of Na2S + S in DMF for synthesis of dithiols from dihalides or disulphonates, and the analogous use of xanthates for the synthesis of optically active thiols from toluene-p-sulphonates under mild conditions. Modifications of known methods were also used in the syntheses of glucopyranoside-6-thiols and l,3,4,6-tetrathio-D-iditol. Related substitution processes have been illustrated in the recent literature, leading to 2,3-dimercaptopropanoic acid and the corresponding alcohol, and... 

Preparations.—a-Mercapto-a-amino-acids R NHCR (SH)C02H are obtained from corresponding chloro-compounds or from 4-chloro-oxazol-5(4H)-ones. Conventional methods are also used for synthesis of thio-resorcinols (from benzene-1,3-disulphonic acids via sulphonyl chlorides, reduced with red P-Ir-AcOH, or from resorcinols via Newman-Kwart rearrangement of O-dimethylaminothiocarbonyl-resorcinols followed by alkaline hydrolysis ). Dithiols are unexpectedly obtained from ethyl a-acetonylacetate by treatment with H2S in acid solution at -40 "C. Mercapto-ethylation of aliphatic amines is best achieved by a modificaticm of the well-established method using episulphides, in aqueous solution in the presence of a silver salt. Methyl sulphides ArSMe may be demethylated by chlorination to ArSCCh followed by acid methanolysis, while aryl diphenylmethyl sulphides are susceptible to electrolytic reduction to the thiophenol. ... 

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