Cone and 1,3‐alternate conformers of 1,3‐bis(ethoxycarbonylmethoxy)‐2,4‐dihydroxycalix[4]arene and 1,2,3,4‐tetrakis(ethoxycarbonylmethoxy)calix[4]arene |
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Authors: | Botjan Genorio Joe Kobe Gerald Giester Ivan Leban |
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Abstract: | The two title ethoxycarbonylmethoxy derivatives of calix4]arene, namely diethyl 2,4‐dihydroxycalix4]arene‐1,3‐diyldi(oxyacetate), C36H36O8, (I), and tetraethyl calix4]arene‐1,2,3,4‐tetrayltetra(oxyacetate), C44H48O12, (II), form two different conformations, viz. a cone in (I), where intramolecular hydrogen bonds are formed through OH groups in a partially substituted calix4]arene, and a 1,3‐alternate form of a completely substituted calix4]arene in (II). A unique three‐dimensional array of molecules exists in (II), with the channels extended along the entire crystal. |
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