SCHEDULED MAINTENANCE
3,4-Bis(trimethylsilyl)thiophene and several other 3,4-disubstituted thiophenes are synthesised by an unprecedented intermolecular cycloaddition–cycloreversion procedure between disubstituted acetylenes and 4-methyl- or 4-phenyl-thiazole; 3,4-bis(trimethylsilyl)thiophene undergoes consecutive regiospecific mono-ipso-iodination and palladium-catalysed reactions to provide unsymmetrically 3,4-disubstituted thiophenes.
X. Ye and H. N. C. Wong, Chem. Commun., 1996, 339 DOI: 10.1039/CC9960000339
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