Irradiation of divinyloxy compounds {CH2![[double bond, length half m-dash]](https://www.rsc.org/images/entities/char_e006.gif)
CHOCH2[CH2OCH2]NCH2OCHCH2; n= 1–4} in the presence of 1,4-dicyanonaphthalene in benzene gave cis- and trans-cyclobutanocrown ethers in good yields.
K. Mizuno, T. Hashizume and Y. Otsuji, J. Chem. Soc., Chem. Commun., 1983, 977 DOI: 10.1039/C39830000977
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