Synthesis and structure of hexa(diethoxyphosphoryloxy)calix[6]areneстатья
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Аннотация:Hexapodand 1, which contains six phosphoryl groups at the lower rim of the macrocycle, was synthesized by the reaction of calix[6]arene with diethylchlorophosphate and sodium hydride. The structure is confirmed by X-ray studies: C66H90O24P6, Pbca, a = 14.867 (4), b = 18.577 (4), c = 26.510(6), D-c = 1.265g/cm(3), Z = 4, and R = 0.063 for the 4600 observed reflections. The molecule 1 exists in a centrosymmetrical flattened 1,2,3-alternate conformation, in which diametrically opposed benzene rings are parallel. Four phosphoryl groups are oriented away from the cycle, two other groups are self-included in the macrocycle cavity.