Rotation about the N2–N3 bond in 3,3-dimethyl-1-(isoxazol-3-yl)triazenes
Abstract
The rotational barrier around the N2–N3 bond of a series of 3,3-dimethyl-1-(isoxazol-3-yl)triazenes was evaluated by means of NMR line shape analysis. The results obtained were compared to 15N chemical shift measurements and semi-empirical quantum mechanical calculations. An increase of N2–N3 bond order, possibly due to an electron withdrawing effect of the isoxazole ring, was noted in our compounds.