Thiophene opening

Benzo[Z)]thiophene reacts with dimethyl l,2,4,5-tetrazine-3,6-dicarboxylate in a cyclo-addition-fragmentation reaction to yield (143), whereas benzo[A]furan and N- methylindole yield products (144) arising from ring opening and recyclization (76AP679). 

Benzo[6]thiophene, 4,7-dialkoxy-synthesis, 4, 930 Benzo[6]thiophene, 2,3-dialkyl-synthesis, 4, 877-878 Benzo[6]thiophene, 3 -(dialkylamino)-synthesis, 4, 925 Benzo[c]thiophene, 1,3-diaryl-oxidative ring opening, 4, 768 Benzo[6]thiophene, 2,3-dibromo-reactions, 4, 830... 

Benzo[c]thiophene, 1,3-diphenyl-oxidative ring opening, 4, 768 synthesis, 4, 141-142... 

Thiophene, 2-amino-3-cyano-5-phenyl-synthesis, 4, 888-889 Thiophene, 3-amino-4,5-dihydro-cycloaddition reactions, 4, 848 Thiophene, 2-amino-3-ethoxycarbonyl-ring opening, 4, 73 Thiophene, 2-amino-5-methyl-synthesis, 4, 73 Thiophene, 2-anilino-synthesis, 4, 923-924 Thiophene, aryl-synthesis, 4, 836, 914-916 Thiophene, 2-(arylamino)-3-nitro-synthesis, 4, 892 Thiophene, azido-nitrenes, 4, 818-820 reactions, 4, 818-820 thermal fragmentation, 4, 819-820 Thiophene, 3-azido-4-formyl-reactions... 

Thiophene, 2,5-dimethyl-3-lithio-ring opening, 4, 81 Thiophene, 2,5-dimethylthio-3,4-disubstituted synthesis, 4, 872 Thiophene, dinitro-... 

R" = H, R = H) gives similar butadienethiolate complexes. Tr-Complexation of thiophene in compounds of the type 123 activates the heterocycle relative toward other nucleophiles, such as OMe , SMe , SEt , S(i-Pr) , andCH(COOMe)2. The products 127 include the ring-opened butadiene-thiolate framework. 

Thiophene, benzo[d]thiophene and dibenzo[d,organosulfur compounds formed at Rh- and Ir-mediated thiophene ring opening 97SL643. 

Benzo[c]thiophene is a source of 3-substituted derivatives of 3,4-dihydro-1//-2-benzothiopyrans via ring opening to the dianion and subsequent reaction with electrophiles <96JOC1859>. 

The progress on S-C bond activation, which covers the reduction of a C-S bond to a C-H bond, cross coupling reaction of sulfides with main group organometaUic nucleophiles, ring opening reactions of thietanes and thiiranes, and desulfurization of thiols, sulfides, and thiophenes has already been reviewed elsewhere [6-10], and... 

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