| http://www.w3.org/ns/prov#value | - Representative phosphorus-containing compounds which may be used include derivatives of groups represented by PX3, RPX2, R2 PX, R3 P, X3 PO, (XO)3 PO, (XO)3 P, R3 P=O, R3 P=S, RPO2, RPS2, RP(O)(OX)2, RP(S)(SX)2, R2 P(O)OX, R2 P(S)SX, RP(OX)2, RP(SX)2, ROP(OX)2, RSP(SX)2, (RS)2 PSP(SR)2, and (RO)2 POP(OR)2, where R is an alkyl or aryl, such as phenyl radical, and X is hydrogen, R, or halide.
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