Reactions of molybdenum(II) azides Mo(η3-C3H5)(CO)2(L2)(N3) (L2 = en, dppe) toward dipolarophiles

The [3 + 2] cycloaddition products Mo(η3-C3H5)(CO)2(en)(N4CR) (R = C(CN)C(CN)2, C6H4NO2, CHCH2), Mo(η3-C3H5)(CO)2(dppe){N4C(C(CN)C(CN)2), and Mo(η3-C3H5)(CO)2(L2){N3C2(CO2C2H5)2} (L2 = en, dppe), and the isothiocyanato compounds Mo(η3-C3H5)(CO)2(L2)(NCS) were prepared and structurally characterized. These compounds are fluxional in solution and the heterocycle ring is N(2) bound to the metal.