Sulfones additions

I.5.3.4.2. Diastereofacial Selectivity I.5.3.4.2.I. Chiral a,/i-Unsaturated Sulfones Addition of Enolates and Related Anions... 

As a direct result of the smdies on the separation of sulfonates, Zheng et al. [67] showed that secondary amines and quaternary ammonium salts could be separated using a cyanophase column using sodium alkyl sulfonate additives in methanol/C02 mixtures with 30 0% methanol in the mixture. Ion-pairing was thought to be the retention mechanism responsible for the separation. 

Dibromothiochromone 1-oxide and its 1,1-dioxide are both well known species. The 2-halogen is easily displaced, while the 3-substituent is much less easily replaced in the sulfoxide than in the sulfone in the sulfone, addition/elimination mechanisms are available... 

Ethoxycarbonyl groups show efficient regiodirecting powers in sulfonate additions, giving exclusive C—S bond formation at the allyl terminus remote to the carbonyl functionality (equation 284).219 Remote oxygen functionality also directs incoming sulfonate nucleophiles to the distal allyl terminus (equation 285).215... 

Formation of Without additives Sulfonate additive Salicylate additive ... 

Introduction. When diazonium salts are reduced, they form aryl-hydrazines (RNHNH2), which are regarded as derivatives of hydrazine, H2N.NH2. When a diazonium salt is added to a solution of bisulfite, it forms the diazonium sulfonate, which, when heated, is reduced by the excess bisulfite to phenylhydrazine sulfonate. Addition of hydrochloric acid ves the phenylhydrazine hydrochloride, which is slightly soluble in an excess of hydrochloric acid. These reactions are represented by the following equations ... 

Twitchell reagent. Catalyst for the Twitchell process (acid hydrolysis of fats). It is a sulfonated addition product of naphthalene and oleic acid, a naphthalenestearosulfonic acid. 

Flexible printed wiring laminates usually contain (but are not limited to) either a polyimide or a polyester [usually poly(ethylene terephthalate)] with copper conductors. These laminates are prepared in sheets or by roll-to-roll lamination, usually by means of an adhesive. Alternatively, direct fusion without an adhesive is used. Recent developments include the use of alternative substrate materials such as poly(ether sulfones), additive plating of copper, and casting of a polymer directly on the copper foil web. 

Classification Nonaromatic sulfur-oxygen compd. Empirical C4H10N2O3S2 Properties M.w. 198.26 m.p. 254-256 C Toxicology Irritating to eyes, skin, respiratory system TSCA listed Uses Reactive sulfonate additive for electroplating baths... 

Empirical C6H13NO3S3 Na Properties M.w. 266.36 Uses Reactive sulfonate additive for electroplating baths... 

No Name point. point. f l Of Sulfone addition Miscellaneous... 

The analysis of reaction rate and thermodynamic parameters in the reaction of phenylmagnesium bromide with phenyl tosylate in THF/toluene binary solvents provides support for the asynchronous S a mechanism comprising a four-centre transition state for the sulfonate addition of Grignard reagents. The relative changes in the rate constants are strictly bound to changes in the equilibrium constant for complex... 

Addition to vinyl ethers and vinyl esters is regioselective, leading to the corresponding j8-alkyloxy/acyloxy sulfone. Addition to alkynes gives vinyl sulfones via a radical pathway. These reactions can be carried out in the presence of peroxide initiators, with Lewis acids such as copper(II) bromide (eq 4), or thermally (eq 5). - ... 

Fig. 22 Amino acid-based organogel formation induced by aromatic sulfonate additives...

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