Abstract
The reaction between some 2-substituted thiophen derivatives and methacrylic acid in PPA has been studied. Isomeric cyclopenta[b]thiophen ketones were formed in several cases, depending on the substituents. Features of their 13C and 1H NMR spectra are discussed and evidence is presented for ringclosure of 3(2-thienyl) propionic acids without rearrangement, in contrast to statements in the literature.
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