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Position of importance: The relative apicophilicity of two substituents linked by a carbon atom to a pentacoordinate phosphorus center such as that in compounds 1 was determined based on the equilibrium ratio of pseudorotamers (1 A and 1 B) in solution. A distinct solvent effect on the relative apicophilicity and a novel phenomenon in which two different pseudorotamers cocrystallized in the same single crystal were observed.
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Matsukawa et al. (2002) studied this question.
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