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The crystal structures of four derivatives of the p-tert-butyldihomooxacalix [4] arenes are reported. These four compounds are obtained by substitution of the four phenolic hydrogens by CH3 or CH2CH3 or CH2 [sbnd] CH = CH2 or groups. The four calixarenes exhibit a 1,2 alternate conformation; the geometry of the dimethyleneoxa group is studied for the different compounds.
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