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(Chemical Equation Presented) Free radical cyclization of 4 and 7 gave the expected cyclization-reduction products (5 and 8) along with considerable amounts of products derived from a cyclization-atom transfer-secondary cyclization process (6 and 9). Two approaches to avoiding these unexpected products were explored. Use of a cyclopropylcarbinyl fragmentation avoided the secondary cyclization reaction (25 or 43 ? 26 or 44), whereas use of an allene as a radical acceptor avoided the atom-transfer reaction altogether (49 ? 52). 2009 American Chemical Society.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N2875 – PubChem