119Sn, 15N, 13C, and 1H NMR Study of the Intramolecular Sn-N Donor-Acceptor Interaction in [2-(Dimethylaminomethyl)phenyl]stannanes

Abstract

¹¹⁹Sn, ¹⁵N, ¹³C, and ¹H NMR spectra were studied for [2-(dimethylaminomethyl)phenyl]stannanes, R¹R²R³R⁴Sn or R¹R²R₂⁴Sn, where R¹, R², and R³ are 1-butyl, Cl or Br, the same or different, and R⁴ is 2-(dimethylaminomethyl)phenyl. The occurrence of intramolecular interaction between the nitrogen and tin atoms was demonstrated based on changes in the characteristic values of the NMR parameters of these nuclides (δ(¹⁵N), δ(¹¹⁹Sn), J(¹¹⁹Sn,¹⁵N), and their interrelations, as well as on the relatively high values of the coupling constants ³J(¹¹⁹Sn,¹³C(CH₂)).