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http://dx.doi.org/10.1002/jhet.5570210214DOI: 10.1002/jhet.5570210214
Application of the okahara cyclization to the preparation of crown ethers with aromatic units
Authors: B. Czech, A. Czech, R. A. Bartsch
Journal of Heterocyclic Chemistry 1984 V. 21, Issue 2, pages 341–343,