J. Chem. Soc., Perkin Trans. 1, 1990, 2909 - 2918
Preparation and Diels–Alder reactivity of thieno[2,3-c]-and thieno[3,2-c]-pyran-3-ones. Stable 2,3-dimethylenethiophene derivatives; synthesis of benzothiophenes
P. Mark Jackson, Christopher J. Moody and Pritom Shah
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http://dx.doi.org/10.1039/P19900002909