The hexaoxa[5.5.5](1,3,5)cyclophane (12) has been synthesised from phloroglucinol and 1,4-dibromobutane by using a stepwise approach. All attempts to effect catalytic hydrogenation of both aromatic rings in the hexaoxa-[6.6.6](1,3,5)cyclophane (12) to give the desired [4]cryptand (14) have proved unsuccessful.
W. D. Curtis, J. F. Stoddart and G. H. Jones, J. Chem. Soc., Perkin Trans. 1, 1977, 785 DOI: 10.1039/P19770000785
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