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The crystal structures of 2,2-dimethyl-5-nitroso-1,3-dioxan-5-yl benzoate, C13H15NO5, (I), 2,2-dimethyl-5-nitroso-1,3-dioxan-5-yl 4-chlorobenzoate, C13H14ClNO5, (II), and 5-nitroso-1,3-dioxan-5-yl 4-chlorobenzoate, C11H11NO5, (III), have been determined in order to gain insight into the conformational preference of α-benzoyloxynitroso. Unfavourable 1,3-diaxial interactions force (I) and (II) to crystallize in the 2,5 twist-boat conformation, whereas compound (III), lacking this destabilizing interaction, crystallizes in the chair conformation.