Thermolysis of thiophenedicarboxylic acid anhydrides as a route to five-membered hetarynes
Manfred G. Reinecke, James G. Newsom, and Lao-Jer Chen
J. Am. Chem. Soc.; 1981; 103(10) pp 2760 - 2769;
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http://dx.doi.org/10.1021/ja00400a046