The synthesis, spectra, and reactions of some S-alkylthiophenium salts

Crystal structure of S-[4-(2,6-dimethylphenylselenide)-3,5-dimethylphenyl]-dibenzothiophenium bis(triflate) hydrate, [C20H16SSe0.5]2 · (CF3O3S)2 · 2.78H2O

“…The related S-alkylthiophenium salt [2] was first prepared in 1964 and subsequently such salts and their reactivities [3] have been reported in detail. However, to date only a few S-arylthiophenium salts have been reported [4].…”

Cationic polymerization of glycidyl phenyl ether initiated by sulfonium salts of phenoxathiin and thianthrene as novel thermal latent cationic initiators

“…14 and 5-methylthianthrenium tetrafluoroborate (4) 14 were prepared by modification of the procedure for 5-methyldibenzothiophenium tetrafluoroborate 12 in 80 and 78% yields, respectively.…”

“…These results are in good accordance with the fact that the nucleophilicity of the sulfides reflects upon the stability of their sulfonium salts. 12,13 On the basis of a moderate nucleophilicity of the sulfur atom in phenoxathiin and thianthrene (e.g., diphenylsulfide Ͼ phenoxathiin Ͼ dibenzothiophene), their sulfonium salts are expected to reveal a good thermal latent behavior. In this article, we describe the activity of the sulfonium salts of phenoxathiin and thianthrene in the cationic polymerization of 1 to evaluate their latent initiating ability (Scheme 1).…”

Synthesis of novel 2‐aminoimidazo[4,5‐b]pyridines, including the thieno analogue of the cooked‐food mutagen IFP

“…The synthesis of the benzothiophene analogues, 2 and 3 ( Figure 1) started in both cases with bromination of benzothiophene. 2-Bromobenzothiophene [41][42][43][44] was synthesized via organometallic bromination [44] and 3-bromobenzothiophene by electrophilic substitution [45]. 2-Bromobenzothiophene was treated according to the literature [46] to introduce the formyl group at C-3 yielding 2bromo-3-benzothiophenecarbaldehyde (19, Scheme 4) [46][47][48][49] in 98% yield, in contrast to the reported [46] 34% yield.…”