A compound containing two phosphorus atoms bonded to each other.
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(η5-Cp)(CO)Fe(Ph2PCH2CH2PPh2)(tetrafluoroborate)
5,11,17,23-tetra-tert-butyl-25,27-diethoxycarbonylmethoxy-26,28-bis(diphenylphosphinomethoxy)calix<4>arene
