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Hydroxythiazolium Hydroxide Inner Salts

The preparation of these [4-hydroxy-THISs, (1), X = O] by cydization of a-carboxy-N-arylthiobenzimides (5) by treatment with acetic anhydride and triethylamine has been investigated in detail, and the structure has been revised for the compound previously described as 2.3-diphenyl-4-hydroxythiazolium hydroxide inner salt (1, X = 0, R = R = Ph, R = H) (Scheme 5) (3, 10). 4-Hydroxy-THlSs also arise by condensation of gem-dicyanoepoxides with thioamides (Scheme 6) (8). [Pg.4]

Irradiation of a 2-methvlthio-4-hydroxythiazolium hydroxide inner salt (12) leads to exchange of the carbon atoms located in the 2 and 4 positions, probably via a thiirenium ion (Scheme 13) (5). [Pg.7]

Hydroxythiazolium hydroxide inner salts, cycloadditions with, 5 cycioadducts, extrusion reactions, 5 1H NMR spectra, 4 from 5-hydioxy-THlSs, 10... [Pg.149]

See other pages where Hydroxythiazolium Hydroxide Inner Salts is mentioned: [Pg.9]    [Pg.217]    [Pg.221]    [Pg.332]    [Pg.2]    [Pg.5]    [Pg.9]    [Pg.217]    [Pg.217]    [Pg.221]    [Pg.332]    [Pg.8]   
See also in sourсe #XX -- [ Pg.8 ]



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4-Hydroxythiazolium hydroxide inner

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Hydroxide salts

Inner salt

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