The bonds are of equal length between the four P atoms, two with the coordination number 4 and two with the coordination number 2, that form the central four-membered ring of the dispirocyclic tetraphosphete 1. This ring exhibits a large rhombic distoration that is manifested by an unusually acute λ5P-λ3P-λ5P angle.
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Frank et al. (1996) studied this question.
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