Synthesis of dicobalt hexacarbonyl 5-p-tolylethynyl-2 '-deoxyuridine

Reactions of 5-p-tolylethynyl-2'-deoxyuridine and 3',5'-di-O-acetyl-5-p-tolylethynyl-2'-deoxyuridine with Co-2(CO)(8) in THF gave 5-p-tolC(2)[Co-2(CO)(6)]-2'-deoxyuridine and 3',5'-di-O-acetyl-5-p-tolC(2)[Co-2(CO)(6)]-2'-deoxyuridine (92 and 66%).