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Abstract

A method of preparing a compound (I) of general formula (R.sub.3 --C).sub.2 P--L.sup.1 --X--L.sup.2 --P--(C--R.sub.3).sub.2, in which R is independently a pendant, optionally substituted, organic group through which the group is linked to tertiary carbon atoms C; L.sup.1 and L.sup.2 are independently, a linking group selected from an optionally substituted lower alkylene chain connecting the respective phosphorous atom to the group X, and X is a bridging group comprising an optionally substituted aryl moiety to which the phosphorous atoms are linked on available adjacent carbon atoms; comprising: (i) reacting together a compound (II) of formula A--L.sup.1 --X--L.sup.2 --A, in which A is a halogen atom, with a metal M in a suitable solvent or form an intermediate compound (III) of formula: A--M--L.sup.1 --X--L.sup.2 --M--A; (ii) reacting said intermediate compound (III) with a compound (IV) of formula: (R.sub.3 --C).sub.2 P--A.sup.1, wherein A.sup.1 is a halogen atom which may be the same as or different from A, to form said compound (I).

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