On irradiation, the ω-phenylalkyl β-oxoesters 1 undergo photocyclization via remote hydrogen abstraction through a cyclic transition state of at least nine atoms.
T. Hasegawa, Y. Horikoshi, S. Iwata and M. Yoshioka, J. Chem. Soc., Chem. Commun., 1991, 1617 DOI: 10.1039/C39910001617
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