2-Benzylcyclopent-2-enones, obtained by rearrangement of the corresponding benzylidenecyclopentanones, are brominated by N-bromosuccinimide at the 4-position; the products upon treatment with silver chrysanthemate give new analogues of the natural pyrethrins.
M. Elliott, N. F. Janes and M. C. Payne, J. Chem. Soc. C, 1971, 2548 DOI: 10.1039/J39710002548
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