Sulphos

When the potassium cyanate used in the above preparation is replaced by potassium thiocyanate (or sulphocyanide), the ammonium thiocyanate formed undergoes partial rearrangement to thiourea (or sulpho-urea). Even above... 

Phenolsulphonephthalein (phenol red). Mix 10 g. of o-sulpho-benzoic anhydride (Section VIII,9), 14 g. of pure phenol and 10 g. of freshly fused zinc chloride in a small conical flask. Place a glass rod in the flask and heat gently over a flame to melt the phenol. Then heat the flask containing the well-stirred mixture in an oil bath at 135-140° for 4 hours. Stir from time to time, but more frequently during the first hour if the mixture froths unduly, remove the flask from the bath, cool and then resume the heating. When the reaction is complete, add 50 ml. of water, allow the water to boil and stir to disintegrate the product. Filter the crude dye with suction and wash it well with hot water. Dissolve the residue in the minimum volume of warm (60°) 20 per cent, sodium hydroxide solution, filter, and just acidify the filtrate with warm dilute hydrochloric acid (1 1). Filter the warm solution, wash with water, and dry upon filter paper. The yield of phenol red (a brilliant red powder) is 11 g. 

Compound nitrated t5% aqueous sulpholan (K) Sulpho- lan (C) 15% aqueous nitromethane (K) Nitromethane (C) 61-05 % perchloric acid (K) 68-3% sulphuric acid (K) 68-3 % sulphuric acid (C) Estimated relative rates ... 

Patton and Reeder s indicator. The indicator is 2-hydroxy-l-(2-hydroxy-4-sulpho-l-naphthylazo)-3-naphthoic acid the name may be abbreviated to HHSNNA. Its main use is in the direct titration of calcium, particularly in the presence of magnesium. A sharp colour change from wine red to pure blue is obtained when calcium ions are titrated with EDTA at pH values between 12... 

A catch and release synthesis of tetrazoles and cyclic amidines has been reported making use of solid-supported oximes [94]. When bound sulpho-nyloximes, obtained by reacting polymer supported sulfonyl chloride with oximes, were reacted with nucleophiles, tetrazoles or cychc amidines were obtained (Scheme 19). Alternatively, the use of TMS-CN affords imino nitriles, which have been used as intermediates for the preparation of indoles, 1,2,3,4-tetrahydropyridines, quinoxalines and benzimidazoles. 

Jahnke M, E Lehmann, A Schoebel, G Auling (1993) Transposition of the TOL catabolic genes Tn46521 into the degradative plasmid pSAH of Alcaligenes sp. 0-1 ensures simultaneous mineralization of sulpho-and methyl-substituted aromatics. J Gen Microbiol 139 1959-1966. 

Denger K, THM Smits, AM Cook (2006) L-Cysteate sulpho-lyase, a widespread pyridoxal 5 -phosphate-coupled desulfonative enzyme purified from Silicibacter pomeroyi DSS-3. Biochem J 394 657-664. 

Laboratory glassware containing diethyl ether residues was cleaned with a sulpho-nitric mixture and caused detonation of the container. 

F. I. Aleev. Oil displacement from heterogeneous seam by pumping sulphuric acid and water to seam—until sulpho-acids appear in liquid removed from wells. Patent RU 2055166-C, 1996. 

Consequently, abstraction of both hydrogens must be taking place in a concerted, or an almost concerted, process, and it has been suggested that the initially formed aziridine intermediate may collapse to the sulpho-namide and a benzyne, the latter going to tars 51>. No evidence has been presented or obtained for the intervention of benzynes in these reactions. The simultaneous abstraction of two neighboring hydrogen atoms has... 

R = H, halo, hydroxy, alkyl, alkoxy X = H, sulpho, carboxyl, sulphonamide Y = alkylene, cycloalkylene linkages... 

Fig. 2 Examples of the structures of a few fast-response electric filed sensitive dyes N-(4-sulpho-butyl)-4-(4-(4-(dipentylamino)phenyl)butadienyl)pyridinium inner salt (RH421, a styrylpyridinium dye), ANNINE 5 (an annellated hemicyanine dye), merocyanine 540, and N-[(4 -dimethylamino)-3-hydroxy-6-flavonyl mcthyl-N,N-trimcthyl ammonium (F4N1, a 3-hydroxychromone dye)...

The combined information gathered from kinetic studies,184 in situ high-pressure NMR experiments,184,185,195 and the isolation of intermediates related to catalysis, leads to a common mechanism for all the hydrogenolysis reactions of (102)-(104) and other thiophenes catalyzed by triphos- or SULPHOS-rhodium complexes in conjuction with strong Bronsted bases. This mechanism (Scheme 41) involves the usual steps of C—S insertion, hydrogenation of the C—S inserted thiophene to the corresponding thiolate, and base-assisted reductive elimination of the thiol to complete the cycle.184 185 195-198... 

An alternative to the supported liquid phase (SLP) method was recently proposed using the same type of solid the supported hydrogen bonded (SHB) catalysts. First demonstrated with the zwitteronic Rh1 catalysts [(sulphos)Rh(cod)] (1) and [(sulphos)Rh(CO)2] (2) (sulphos = 03S(Cr,I I4)CI I2C(CH2PPh2) ). the immobilization procedure is based on the capability of the sulfonate tail of sulphos to link the silanol groups of the support via hydrogen bonds (Figure 12). 

Figure 3.44 Analysis of chronopotcntiograms for the reduction of C02 in dimethyl sulpho-xide at mercury and gold electrodes. The solutions were saturated with l"u C02 (by volume in N2), the current was 17pA (Au) or 35 pA Hg), the electrode areas were 0.225 cm2 (Au) and 0.222cm2 (Hg). From Haynes and Sawyer (1967). Copyright 1967 by the American Chemical Society. Reprinted with permission.

As part of a search for catalysts that can be used under biphasic conditions, zwitterionic Rh(sulphos)(cod) derivatives were studied. The isomerization of allyl alcohol proceeded within 1 h at 100 °C using only 1 mol% catalyst to give propanal in quantitative yield (Equation (12)).46 After separation of the product, the catalyst could be recycled three times with a slight deactivation after each run. 

The preparation of the following sulpho derivatives has also been described ... 

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