4-Dodecylbenzenesulfonic acid

However, when it comes to the more important 2,2-diaryl derivatives (1.25), the routes illustrated in Figure 1.7 are not very useful. For these derivatives the almost universally adopted synthetic method involves the reaction of a l,l-diarylprop-2-yn-l-ol (1.24) with a substituted phenol or naphthol in the presence of an acid catalyst. The acid catalyst can be alumina, an acidic clay or Nafion for heterogeneous reactions, or trifluoroacetic acid, p-toluenesulfonic acid and dodecylbenzenesulfonic acid for reactions carried out in solution. The alkynols are prepared by reaction of a benzophenone (1.22) with a Na or Li derivative of an alkynide, such as the trimethylsilyl acetylide (1.23), (Figure 1.8). ... 

Three versions of this concept have been used to prepare LB film containing MCs. In the first, pioneered by Fendler (13-16), a compressed Langmuir monolayer is used as a template for the preparation of Q-state particles. For instance, diffusion of H2S through a monolayer of dodecylbenzenesulfonic acid (17) or a bis amine type surfactant (14) into a Cdz+ solution resulted in the growth of Q-state CdS under the monolayer. The vertical dipping technique (Fig. 3.5.2) was then used to transfer the monolayer, with associated semiconductor, to a substrate to give multilayer LB films. 

Mono- and multiparticulate CdS layers CdS Monoparticulate layers of dodecylbenzenesulfonic-acid-stabilized CdS nanoclusters were constructed, sequentially transferred to solid substrates by the LB technique, and characterized 95... 

N-Dodecylbenzene Docecylbenzenesulfonic Acid Dodecylbenzene (Linear) Dodecylbenzenesulfonic Acid, Calcium Salt... 

Dodecylbenzenesulfonic Acid, Isopropylamine Salt Dodecylbenzenesulfonic Acid, Triethanolamine Salt... 

In 1991, over 1 x 106 t sulfonic acids were produced in the United States (24). The materials, for the most part, were used as intermediates for the manufacture of sulfonates in the detergent market, dye manufacture, dispersing agents, catalysts, polymers, etc. Production of dodecylbenzenesulfonic acids derivatives dominated the sulfonic acid market (Table 2). These had a 38% overall share. The differences between the production tons and the tons sold is accounted for by in-plant use by various manufacturers verses merchant market production. 

One general method for the preparation of 6,7-dihydro-l,4-dioxepins of type (362) involves ring expansion thus, treatment of 2-(methoxymethyl)-l,3-dioxane (361) with dodecylbenzenesulfonic acid at 250°C and simultaneous distillation gave (362) with 69% conversion and 84% selectivity... 

A surfactant (dodecylbenzenesulfonic acid) was used. The use of carbon tetrachloride and trimethyloctadecanoylammonium chloride was also reported. A poly(styrenesulfonic acid) ion-exchange resin. 

Ion pair mixture QAS + anionic, nonionic, or amphoteric compound, for example, dodecylbenzenesulfonic acid (DDBSA) + quaternary ammonium compound (with appendages <6 carbons) Baker Petrolite (Crosby et al., 2005)... 

Chrysoidine dye salts of dodecylbenzenesulfonic acid are soluble in glycols and glycol ethers and are used in the production of inks, printing inks, and varnishes [2],... 

The oxidation reactions were performed in a glass batch reactor, equipped with magnetic stirrer (mechanic for L-sorbose oxidation), reflux condenser and thermometer. The reaction conditions are summarized in Table I. Before reaction the catalyst was pre-reduced in situ in a nitrogen atmosphere ( 20 min) with the alcohol reactant in 30-40 ml alkaline water (and dodecylbenzenesulfonic acid sodium salt detergent for water-insoluble reactants). The reactor worked in a mass transfer limited regime, controlled by the air flow rate (7.5-20 cm3min 1) and the mixing rate (1500-1800 min 1). The reactions were followed by GO or HPLC analysis. 

To a 500-ml reaction flask were added, l,l-diphenyl-2-propyn-l-ol (0.1 mol, 20.8 g, Farchan Laboratories), 2-naphthol (0.11 mol, 15 g) and 200 ml of toluene. The mixture was warmed to 55°C with stirring while dodecylbenzenesulfonic acid was added dropwise until a permanent dark red-black color was obtained. The temperature was maintained at 55°C until thin-layer chromatography (TLC) indicated the reaction was complete (approximately 1 h). Then the mixture was poured into an equal volume of 10% aqueous sodium hydroxide, shaken, and the organic fraction separated. The toluene solution was washed with water, phase separated, and the solvent removed on a rotary evaporator. The resulting light tan crystals were slurried with hexane, suction filtered, and dried to yield 18.4 g of product with a melting point range of 156-158°C. 

The initial product 508 of AFC reactions of aromatic aldehydes, primary amines, and indoles is highly reactive and further addition of indoles gives undesired adduct 509 (Scheme 104) <2006OL4939>. In addition, aromatic aldehydes are themselves known to react with indoles directly to afford the undesired bisindolyl product 509. After screening catalysts (AcOH, TFA, Sc(DS)3, dodecylbenzenesulfonic acid, carboxylic acids from -C7Hi5 to -Ci3H27), it was revealed that decanoic acid ( -C9Hi9C02H) efficiently promoted the reaction without formation of product 509. 

---