Imidazoline-2-thiones

Many mercaptoazoles exist predominantly as thiones. This behavior is analogous to that of the corresponding hydroxyazoles (c/. Section 4.02.3.7). Thus oxazoline-, thiazoline- and imidazoline-2-thiones (521) all exist as such, as do compounds of type (522). However, again analogously to the corresponding hydroxyl derivatives, other mercaptoazoles exist as such. 5-Mercaptothiazoles and 5-mercapto-l,2,3-triazoles (523), for example, are true SH compounds. [Pg.102]

Imidazoline, 2-phenyl-pKa, 5, 425 <69BSF4075, 73JCS(P2)1371) 4-Imidazoline-2-thione... [Pg.29]

Imidazoline-2-thione, 4,5-diphenyl-oxidation, 5, 405, 445 Imidazoline-2-thione, 4-methyl-Mannich reaction, S, 405 oxidation, 5, 445... [Pg.658]

S-group removal from, S, 445 oxidation, S, 445 reactions, S, 443-445 reactivity, 5, 375-376 synthesis, S, 493 Imidazoline-2-thiones Mannich reaction, 5, 405 reactions, 5, 102, 443-444 with alkynes, 5, 444 synthesis, S, 493... [Pg.658]

However, the thione form of mereaptoazole ligands is retained in the metal eomplexes of l-methyl-l,3-imidazolin-2-thione 370 (90POL981) and 371 [92ICA75 93JOM(453)47], l-phenyltetrazol-5-thione 372 [96JOM (513)63] and l,3-thiazolidin-2-thione 373 (89ICA265). [Pg.290]

TOTWUU l,l -Methylenebis(S-iodine-3-methyl-4-imidazoline-2-thione) 2.683 2.897 175.71... [Pg.89]

X3 13C1N203S l-(p-Chlorophenyl)-4-o -D-erythrofuranosyl-4-imidazoline-2- thione CPEFIM 32 367... [Pg.391]

Gold(I) complexes with thiones are numerous and have several stoichiometries. The homoleptic [AuL2]+ have been obtained for L = imidazoline-2-thione,3029 4-amino-3-methyl-l,2,4-triazoline-5-thione 1560),3030 A -R-1,3-imidazoline-2-thione (R = Pr, Et),3031,3032 l,3-thiazoline-2-... [Pg.1071]

Unsaturated five membered 2-chalcogenons with two heteroatoms at 1,3-positions (6) will show versatile reactivities with acceptors, since E in 6 must be very electron rich with the formation of a stable cyclic 671 electron system (6A).27,28 A saturated ring system 7 is expected to show similar trend due to the stabilization by the allylic X-C-Y framework with 471 electrons (7A). Arduengo reported the TBP formation of 1,3-dimethyl-4-imidazoline-2-thione (8), a typical example of 6 (X = Y = NMe and E = S), with bromine (8 Br2), together with the reactions.36... [Pg.648]

Like many of the nitrogen heterocycles possessing tetrahydroxybutyl side-chains (which tend to form anhydrides), the unsubstituted imidazoline-2-thione 92 readily loses water on heating its aqueous solution under pressufe,97 to give 93, and as with other 1-substituted 2-thiones, it is converted into the 1-aryl-4-(D-arabino-tetrahydroxyl-butyl)imidazole (94) by desulfurization followed by oxidation of the product with oxygen in the presence of a platinum catalyst.98... [Pg.372]

Numereous derivatives of benzimidazole, naphthoimidazoles and other condensed imidazole systems can be very effectively thiated with elemental sulfur on heating without solvent at 230-260°C. The product of this reaction is the corresponding imidazolin-2-thione formed in excellent yield (67ZOR1518, 95IZV2231). For example, imidazo[4,5-cjpyridines (329, R =H, Aik, Ar, C6H5CH2) gave 1,3-dihydro-2//-imidazo[4,5-c]pyridine-2-thiones (330). [Pg.415]

Formation of imidazoles from thiourea derivatives has been limited largely to the 2-alkylthio or 2-aralkylthio-substituted rings (unsubstituted 2-mercaptoimidazoles will be classified as 4-imidazoline-2-thiones in this review). [Pg.102]

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