om300649q_si_001.pdf (950.42 kB)
Comparison of Decamethyldizincocene [(η5‑Cp*)2Zn2] versus Decamethylzincocene [Cp*2Zn] and Diethylzinc Et2Zn As Precatalysts for the Intermolecular Hydroamination Reaction
journal contribution
posted on 2012-10-22, 00:00 authored by Anja Lühl, Larissa Hartenstein, Siegfried Blechert, Peter W. RoeskyA comparison of the Zn–Zn bonded species [(η5-Cp*)2Zn2] versus the related organometallic
zinc compound [Cp*2Zn] and ZnEt2 for the intermolecular
hydroamination reaction in the presence of equimolar amounts of [PhNMe2H][B(C6F5)4] is reported.
All compounds show high reaction rates under mild conditions and a
good functional group tolerance for the addition of aniline derivatives
to primary alkynes. Within this series the metallocene [Cp*2Zn] is the most active one, whereas the zinc–zinc bonded species
[(η5-Cp*)2Zn2] shows the best
selectivity. Most remarkable is the unexpected excellent catalytic
performance of the zinc–zinc bonded species [(η5-Cp*)2Zn2].