Abstract
The P=icr;S functional group in (η 2-PCy 2 ▪S)Mn(CO) 4 ( 1) undergoes cyclocotrimerization with t-butyl propynoate to give the isomeric compounds 3a und 3b in a 1 : 1 ratio. Oxidation of 3a and 3b with (NH 4) 2[Ce(NO 3) 6] gives thiophene 4. Compounds 3a and 3b were characterized by use of MS spectrometry and IR, 31P{ 1H}, 1H, and 13C{ 1H} NMR spectroscopy.
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