Thiophenes mercapto-, tautomerism

Thiophene, 2-hydroxy-5-methyl-synthesis, 4, 926 Thiophene, iodo-Grignard reagents, 4, 79, 831 photolysis, 4, 832 reactions, 4, 932 with phenyllithium, 4, 831 synthesis, 4, 835, 934 Ullmann coupling reactions, 4, 837 Thiophene, 2-isopropyl-3-methyl-synthesis, 4, 901 Thiophene, mercapto-reactions, 4, 78 stability, 4, 825 synthesis, 4, 80, 835, 930-931 tautomerism, 4, 38, 727 Thiophene, 2-mercapto-5-methylthio-synthesis, 4, 872 Thiophene, 2-methoxy-chloromethylation, 4, 759 Thiophene, 3-methoxy-chloromethylation, 4, 759 Thiophene, 5-methoxy-2,4-dinitro-Meisenheimer complexes, 4, 815 Thiophene, 2-methoxy-5-methyl-Vilsmeier formylation, 4, 759-760 Thiophene, 2-methoxy-3-nitro-reactions, 4, 827 Thiophene, 2-methyl-bromination, 4, 799-800 conformation, 4, 32 HNMR, 4, 730 metallation, 4, 773 synthesis, 4, 885, 887 trifluoroacetylation, 4, 751 Thiophene, 3-methyl-bromination, 4, 799-800 conformation, 4, 32 H NMR, 4, 730 metallation, 4, 60 oxidation, 4, 800... 

Thioindoxyl 2-substituted synthesis, 4, 892 synthesis, 4, 880, 894, 927 tautomerism, 4, 728 Benzo[6]thiophene, 4-hydroxy-synthesis, 4, 905, 928 Benzo[i>]thiophene, 5-hydroxy-synthesis, 4, 928 Benzo[i>]thiophene, 6-hydroxy-synthesis, 4, 928 Benzo[6]thiophene, 7-hydroxy-synthesis, 4, 928 Benzo[f>]thiophene, 2-iodo-synthesis, 4, 934 Benzo[f>]thiophene, 3-iodo-synthesis, 4, 934 Benzo[6]thiophene, 2-mercapto-synthesis, 4, 931 tautomerism, 4, 38 Benzo[6]thiophene, 3-mercapto-synthesis, 4, 931... 

The most important potentially tautomeric thiophenes and furans are those carrying hydroxyl, mercapto, and amino groups. In these compounds a prototropic shift can occur between the functional group... 

The Structures and Reactions of Hydroxy- and Mercapto-thiophens and their Simple Derivatives.—2-Hydroxythiophens can in principle exist in three tautomeric forms, the hydroxy-form (110) and the 3- (111) and 4-thiolen-2-one (111a) forms. During recent years a series of derivatives of the 2-hydroxythiophen system, substituted with halogen, methoxy, aryl, and... 

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