Sulfur-containing groups

Effect of Some Nitrogen-, Oxygen-, and Sulfur-Containing Groups on the Rate Constants for the Reaction of Chloro-s-triazine Derivatives with Various Nucleophiles... 

It is for this reason that not only the various Sulfur-containing groups present, but also the mono- and dimethyl-substituted species of benzothiophenes and dibenzoth-iophenes have to be separated and quantified individually. As the number of sulfur compounds present in (heavy) middle distillate fractions may easily exceed 10 000 species, a single high resolution GC capillary column is unable to perform such a separation. 

This chapter describes the chemical behavior of a-sulfinyl and a-sulfonyl carbanions. The stereoelectronic effects of these sulfur-containing groups have been the subject of much controversy for more than a decade which has now gradually settled down. Meanwhile, the special features of the chemical behavior of these groups have been utilized for syntheses of thousands of useful organic substances. This chapter deals with the... 

Electron-accepting conjugative effects of sulfinyl and sulfonio groups may be seen in a few experimental observations. For example, it was reported twenty years ago that p-iodophenyl sulfoxide reacted readily with alkali hydroxide whereas the m-isomer did not react under the same conditions36. More recent quantitative data on the electron-accepting effects of these tri- and tetra-coordinated sulfur-containing groups can be found in the quantitative data on reactivities, listed in Table 6. 

Sulfur-containing groups at an a-position stabilize carbanions. All these species, i.e., the a-sulfonyl 6281-102, a-sulfmyl 6346-80, a-sulfenyl 645,103,104 and a-sulfonio carbanions 65105-1 ancj those derived from sulfonates 66 and sulfonamides 6795 may retain their... 

These reactions are convenient methods for putting sulfur-containing groups onto an aromatic ring. With Ar S", diazosulfides Ar—N=N—S—Ar are intermediates, which can in some cases be isolated. Thiophenols can be made as shown above, but more often the diazonium ion is treated with EtO—CSS" or S2", which give the expected products, and these are easily convertible to thiophenols. Aryl triflates have been converted to the aryl thiol using NaST(P5) and a palladium catalyst, followed by treatment with tetrabutylammonium fluoride. See also 14-27. 

Replacement of the Diazonium Group by Sulfur-Containing Groups... 

Obviously p-substituted sulfur-containing groups can conjugate with the phenolate ion by... 

The dissimilarity found between the homogeneous and heterogeneous reduction processes can be attributed to a specific interaction of the sulfur-containing groups with the material of the electrode. 

X.X Acting on reduced flavodoxin as donor. 2. 8. X.X Transferring sulfur-containing groups. 

Sulfur-containing groups serve as acceptors successfully. /1-Ketosulfoxides and /1-ketosulfones 68 form aminopyrans 69 with UNs... 

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