chlorophosphate compound r 2 o 2 pocl and in the compound of formula iv is a c 1 6 alkyl group preferably methyl or ethyl step d is conducted in a polar organic solvent suitable polar organic solvents include for example diethyl ether dipropyl ether diisopropyl ether dibutyl ether methyl tert butyl ether mtbe dipentyl ether diisopentyl ether ethylene glycol dimethyl ether diethylene glycol dimethyl ether dioxane tetrahydrofuran n n dimethylformamide n n dimethyl acetamide dmso or n methyl 2 pyrollidone step d is conducted at a temperature of about u2212 90 u00b0 c to about 0 u00b0 c preferably about u2212 50 u00b0 c to about u2212 5 u00b0 c more preferably about u2212 30 c to about u2212 10 u00b0 c in one embodiment step d is conducted at a temperature of about u2212 20 u00b0 c the term u201c about u201d in this context means a temperature between 10 above and 10 below the recited value inclusive for example u201c about u2212 20 u00b0 c u201d means a temperature falling in the range u2212 18 u00b0 0 c to u2212 22 u00b0 c step e of the inventive process is an iodination that comprises reacting a compound of the formula iv produced in step d with trimethylsilyl iodide tmsi or with sodium iodide nal and trimethylsilyl chloride tmscl in an aprotic organic solvent to form a compound of the formula 1 the synthesis of the compound of formula 1 from the vinyl phosphate compound of formula iv is related to a known procedure for the preparation of vinyl iodides from ketone derived enol phosphates lee k wiemer d.