Abstract
Water-soluble diphosphine tetraphosphonates [(RO)2OPCH2CH2]2P–X–P[CH2CH2PO(OR)2]2(X = C6H4 or C2H4, R = Et or Me) were synthesized in near-quantitative yields by a base-catalysed Michael addition of appropriate P–H bonded compounds to vinylphosphonates in the presence of potassium tert-butoxide. The reactions of these compounds with [ReO2I(PPh3)2] in biphasic media (aqueous–organic) produced water-soluble dioxorhenium complexes of the type [ReO2{[(RO)2OPCH2CH2]2P–X–P(CH2CH2PO(OR)2}2]+ in near-quantitative yields. The water-soluble phosphines and their rhenium complexes were characterized by IR, 1H and 31P NMR and high-resolution fast atom bombardment mass spectral analysis.
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