amines, esters, halides, and alkenes. Terminal alkynes gave a mixture of alkanes and
alkenes. Finally, after extraction, the catalyst layer could be reused without loss of
reactivity for up to seven cycles.
In Situ Preparation of the Fe(0) NP Catalyst A 10 mL flask was charged
with FeCl 3 (0.20 mmol, 33.1 mg) and THF (3.6 mL) in a glovebox. Under
vigorous stirring, EtMgCl in THF (2 M, 0.80 mmol, 0.40 mL) was added dropwise.
The resulting dark mixture was stirred at rt. for 30 min before use.
Hydrogenation of Alkynes with [Fe(0)]/IL-1/MeCN A 4 mL vial with screw
cap and PTFE septum was charged with [BMIM][NTf 2 ] (IL-1) (150 μL) and
0.50 mL of the freshly prepared catalyst solution in a glove box and the mixture
was stirred for 2 min before THF was evaporated under reduced pressure (oil pump).
The vial was transferred back into the glove box, charged with an alkyne
(0.50 mmol), dry acetonitrile (0.50 mmol), and dry n-heptane (0.50 mL), and
Magnetite (Fe 3 O 4 )
Maghemite (γ γ-Fe 2 O 3 )
Fig. 47 Crystal structure of magnetite (Fe 3 O 4 ) and maghemite (γ-Fe 2 O 3 ) – reproduction
from ref. [115]
Earth-Abundant and Precious Metal Nanoparticle Catalysis
117