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Trivalent PhosphorusPhosphorusKinetics and MechanismNuclear MagneticOrganophosphorus CompoundsPhosphorus AcidOrganosilicon CompoundsElectrochemical ReductionPhosphorus TrichlorideResonance MethodResonance SpectraAcid DerivativesSpatial StructureMETHYLMolecular PolarizabilityPhosphorus PentachlorideTrialkyl PhosphitesPhosphonic AcidAromaticin Water