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Abstract

A method of manufacturing a compound 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 each R is independently a pendant, optionally substituted, organic group through which the group is linked to tertiary carbon atom C; L.sup.1, L.sup.2 are independently a linking group selected from an optionally substituted lower alkylene chain connecting the respective phosphorus atom to the group X and X is a bridging group comprising an optionally substituted aryl moiety to which the phosphorus atoms are linked on available adjacent carbon atoms, comprises: i) reacting together a compound of formula H--L.sup.1 --X--L.sup.2 --H with an organometallic compound to form an intermediate compound of formula M--L.sup.1 --X--L.sup.2 --M, where M is an alkali metal atom; ii) reacting said intermediate compound with a compound of formula (R.sub.3 --C).sub.2 P--A, where A is a halogen atom, to form said compound of general formula (R.sub.3 --C).sub.2 P--L.sub.1 --X--L.sup.2 --P--(C--R.sub.3).sub.2, M is preferably lithium, potassium or sodium and the intermediate compound may be isolated or not. The reaction (i) may advantageously be carried out in the presence of a complexing agent such as tetramethyethylenediamine.

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