Sulfanes, aryl

Aryl-arylazo-sulfane reagieren mit 2-Hydroxy-naphthalin in alkalischem Ethanol zu Azo-Verbindungen. Die Reaktionen werden dutch elektronenliefernde Substituenten im N-Aryl-Teil erleichtert bzw. im S-Aryl-Teil erschwert1. 

A more general synthetic procedure to prepare aryltrifluoro-l -sulfanes. e.g. 4, is the fluorination of an aryl disulfide, e.g. 3, with silver(ll) fluoride, although the cost of the silver(II) fluoride precludes large-scale synthesis.80... 

Triphenylphosphane is an oxophilic compound that reduces sulfoxides (R2SO), disulfane oxides (RS(O)SR), disulfane dioxides (sulfones) (RSO2SR), and trisulfane tetroxides to the corresponding sulfanes. From the products prepared by equations (62) or (63), symmetrical or unsymmetrical aryl- or alkyltrisulfanes can be obtained in high yields (refluxing in ether or benzene) (equation 64). ... 

N-Aryl- Ell, 898 (Anilin + Sulfan) N-(4-Methyl-benzolsulfonyl)- Ell, 891 (Chloramin-T + Sulfan)... 

Both the H chemical shifts and NOE data suggest that chloro-A -sulfanes and sulfonium salts 24 and 25 having an o-MeO, o-Cl, or o-Me substituent on the aryl ring assume a skew conformation, whereas the aryl ring in compounds without an ortV o-substituent can rotate practically freely about the S-C(l ) axis. H and N NMR examinations of diaryl(acylamino)(chloro)-A -sulfanes 24a-e showed that they exist only in CDCI3 and dimethyl sulfoxide-t4 (DMSO- 6) solvents (Equation 3), whereas in MeOD complete ionic dissociation takes place, leading to the sulfonium chloride (see Table 5) <2001J(P2)339>. 

Elemental sulfur is an extremely hydrophobic material and the same holds for sulfur-rich compounds R-S -R with hydrophobic organic terminal groups R like alkyl or aryl. However, strongly hydrophihc groups Hke -SOs" are able to turn these hydrophobic substances into hydrophihc materials even at very high sulfur contents. Sulfane disulfonate anions S (S03)2, better known as polythionate anions, are such species which quahfy for amphiphilic behavior in water. These ions exist as a long homologous series with n... 

Diese Methode ist auf aliphatische und aromatisehe Thiocarbonsaure-S-alkylester beschrankt bei S-Aryl-estem sinkt die Ausbeute an Sulfan auf 8%250. 

The electrochemical reduction of triorganosulfonium salts (21) to a diorganosul-fane and a hydrocarbon proceeds via an ECE mechanism [27] wherein two heterogeneous electron transfer steps are associated with the veiy fast (chemical) decomposition of the transient sulfuranyl radical (22) to the sulfane and an alkyl (or aryl) radical (Scheme 9). Nevertheless, from irreversible one-electron reduction peaks observed in cyclic voltammograms of phenyldialkylsulfonium salts... 

Photolysis of methyl(L)cobaloxime as a methyl radical source, in the presence of the 4-chlorophenylester of thiolacetic acid (33) yields 4-chlorophenylmethyl-sulfane (34). The reaction (Scheme 12) is described by Tada et ai [33] as proceeding through sulfuranyl radical (35) as intermediate or transition state . No such intermediate is discussed in a corresponding intramolecular homolytic attack at a thiolester S atom by an aryl radical, with release of the acyl radical described in Scheme 13, wherein acyl radicals (36) are efficiently generated from aryl iodides (37) by two efficient free radical reactions, namely iodine... 

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