DETAILED DESCRIPTION OF THE INVENTION The organophosphates and organophosphoramides contemplated for use in the present invention are those which are capable of causing the metal halide to go into solution.
Typical organophosphates would include those of the formula (RO).
sub.
3 PO wherein each R can be the same of different hydrocarbyl radical containing 1 to 10 carbon atoms.
Typical representative examples of such compounds include tri-n-butyl phosphate, triethyl phosphate, triphenyl phosphate, and the like and mixtures.
The currently preferred phosphates are those wherein each R is an alkyl radical containing 1 to 6 carbon atoms.
Typical organophosphoramide would include those of the formula (R.
sub.
2 N).
sub.
3 PO.
Representative examples of such compounds include hexamethylphosphoramide, hexaethylphosphoramide, and the like and mixtures.
The metal halides include the chlorides, bromides, and iodides of the specified metals.
They are preferably used in a substantially anhydrous form.
Representative examples of such metal halides include magnesium dichloride, magnesium diiodide, magnesium dibromide, manganese dichloride, lanthanum trichloride, cerium trichloride, praseodymium trichloride, samarium trichloride, erbium trichloride, gadolinium trichloride, neodymium trichloride, dysprosium trichloride and the like.
The liquid employed for forming the solution should be dry, i.
e.
substantially free of water.
Typically the liquid is an organic liquid which is liquid at normal room temperatures, viz.
50.
degree.
F.
to 90.
degree.
F.
Typical liquids include, for example, normally liquid hydrocarbons having 3 to 12 carbon atoms per molecule, such as n-pentane, n-heptane, methylcyclohexane, toluene, xylenes, and the like.
The currently preferred liquids are aliphatic hydrocarbons containing 4 to 8 carbon atoms per molecule.
The amount of organophosphate or organophosphoramide needed to cause the dissolution of the metal halide can vary depending upon the metal halide selected and the desired level of dissolution of the metal halide
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Molecular Biology 
