NMR spectroscopic studies on the complex of acrylonitrile with AlEt₃ or AlEtCl₂ in toluene

Mechanism of alternating copolymerization of acrylic monomers with donor monomers in the presence of lewis acid

“…13C-NMR spectra can reveal the p-electron density of the carbons in the acrylic monomer more definitely. The formations of the 1 :I ethyl aluminum chloride-acrylonitrile complexes cause downfield shifts of the lines for /?-carbon (9.7-10.5 ppm) and cyano-carbon (0.5-0.4 ppm), and upfield shift of a-carbon (5.1-6.1 ppm) (Furukawa et al, 1974;Koma et al, 1974). The shift of each carbon of the ethylaluminum dichloride-methacrylonitrile complex shows a similar tendency to that of the ethylaluminum dichloride-acrylonitrile complex as mentioned above, except a-methyl carbon shifts upfield by 2.0 ppm (Furukawa et al, 1974).…”

“…-Tl] and [AlEts(AN) -. Tl], are also determined in toluene at 28" C by using the proton chemical shift: KI = 0.04 and 0.1 l./mole, respectively (Koma et al, 1974).…”

NMR studies on the reaction between methacrylonitrile and trimethylaluminum

“…Previously, we also reported the NMR investigation of the complex of acrylonitrile with triethylaluminum. 6 During the course of the subsequent investigation on complex formation between nitriles and alkylaluminum compounds, it was found that methacrylonitrile (MAN) reacts with trimethylaluminum (AlMe3) to give dimethyl(a-methyl isopropylidene amino)aluminum via a stoichiometric complex between them. In the reaction of MAN with AlMe3, Kuran et al 7 have previously reported on the formation of dimethyl(a-methyl isopropylidene amino)aluminium.…”