Abstract (eng)
The aim of the work was to gain insight into the mechanism of the reaction of the (intramolecular) hydroamination as well as the (intramolecular) hydroamina-tion/carbocyclization, utilizing the kinetic isotope effect.
The reaction of secondary amines as well as the corresponding N-deuterated sec-ondary amines (N-methylpent-4-en-1-amine (3), N-benzylpent-4-en-1-amine (4), N-allylpent-4-en-1-amine (5), as well as N,2,2-trimethylpent-4-en-1-amine (6)) were studied using Cp*2SmCH(TMS)2 (1) and BINO-TPS-Y(BDMA) (2) as catalyst.
The reactions were performed on an NMR-scale and monitored by NMR-spectroscopy using ferrocene as internal standard. From these measurements the reaction rates and the kinetic isotope effects were calculated.
Furthermore, a comparison of the two catalysts was performed and the activation parameters were obtained for N-methylpent-4-en-1-amine (3) as well as for N-allylpent-4-en-1-amine (5).
A suggestion for the reaction mechanism is given, using this data and prior studies of the hydroamination as well as the hydroamination/carbocyclization.