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Abstract 2,5‐Dimethylene‐2,5‐dihydrofuran (3), generated flash pyrolitically, underwent di‐ and trimerization reactions to give cyclic dimer and trimer. Compound 3 was trapped with methanol, ethanol, bromine, acetic acid, thiophenol and oxygen. Results from trapping experiments suggest that the diradical form of 3 is involved.
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Chen et al. (1992) studied this question.
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