Full experimental details are given for the application of the di (1, 2-dimethylethenylene) pyrophosphate method of phosphodiester synthesis to the conversion of deoxyribonucleosides into deoxyribodinucleotides in the dG, dA, dC and dT families. N-(1, 2- dimethylethenylenedioxyphosphoryl) imidazole is superior to the corresponding pyrophosphate as a reagent for the conversion of deoxyribodinucleotides into ...