Rhenium tricarbonyl complexes of 1-benzyl-4-(5-bipyridyl)-1H-1,2,3-triazoles

Copper(I) catalyzed [3+2] cycloaddition reactions between 5-ethynylbipyridine and benzyl, p-methylbenzyl, or m-bromobenzyl azides yields the corresponding 1-benzyl-4-(5-bipyridyl)-1H-1,2,3-triazoles 1–3. Reaction between 1–3 and [NEt4]2[Re(CO)3Br3] yields the [1-benzyl-4-(5-bipyridyl)-1H-1,2,3-triazole]Re(CO)3Br complexes 4–6. The Re(CO)3Br complexes of 5- and 6-ethynylbipyridine complexes (7–8) are prepared in a similar fashion. Cycloaddition reactions between 7 and benzyl azide yields mixtures of 4 and unreacted starting material.