| http://www.w3.org/ns/prov#value | - A method of preparing (4R,4'R)-2,2'-bis(o-diarylphosphinophenyl)-4,4'5,5'-tetrahydro-4,4'-bi(1,3 -oxazole) represented by the formula (Ib) as defined in claim 2, which method comprises reacting(R)-bis-o-dihalophenyl)-tetrahydro-bi(1,3-oxazole) of the formula (III) ##STR7## wherein X is fluorine, chlorine, bromine or iodine; and alkali metal diarylphosphide (MPR.sub.2), wherein M is an alkali metal
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