| 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 a phenyl radical and X is hydrogen, R, or halide.
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