480
S. Swami and R. Shrivastava
Si
HO
OH
HO
O
HO
N
O
O
R
H 2 N
R= H(Gly-chol
R= - (CH 2 ) 4 -NH 2 (Lys-Chol)
Scheme 5 Silanization of iron oxide magnetic nanoparticles
O
OH
N
HO
O
O
OH
R
H 2 N
O
O
NC
R
H
NC
R
O
HO
N
HO
O
O
OH
R
NH 3
O
O
NC
R
H
O
O
HO
N
HO
O
O
OH
R
NH 3
O
O
H
O
R
CN
H
OH
R
CN
H 2 O
Scheme 6 Proposed ion-pair mechanism for the Knovengel condensation reaction using Lys-CholMNPs and Gly-Chol-MNPs catalyst
carbonyl group of the benzaldehyde to yield an enol species, which finally offered
the desired product via capturing the proton of the catalyst (del Hierro et al. 2018).
Similarly, a silver supported γ-Fe 2 O 3 @HAp-Ag magnetic nanoparticle catalyst
was prepared for coumarin synthesis. These MNps used as magnetically recyclable
S. Swami and R. Shrivastava
Si
HO
OH
HO
O
HO
N
O
O
R
H 2 N
R= H(Gly-chol
R= - (CH 2 ) 4 -NH 2 (Lys-Chol)
Scheme 5 Silanization of iron oxide magnetic nanoparticles
O
OH
N
HO
O
O
OH
R
H 2 N
O
O
NC
R
H
NC
R
O
HO
N
HO
O
O
OH
R
NH 3
O
O
NC
R
H
O
O
HO
N
HO
O
O
OH
R
NH 3
O
O
H
O
R
CN
H
OH
R
CN
H 2 O
Scheme 6 Proposed ion-pair mechanism for the Knovengel condensation reaction using Lys-CholMNPs and Gly-Chol-MNPs catalyst
carbonyl group of the benzaldehyde to yield an enol species, which finally offered
the desired product via capturing the proton of the catalyst (del Hierro et al. 2018).
Similarly, a silver supported γ-Fe 2 O 3 @HAp-Ag magnetic nanoparticle catalyst
was prepared for coumarin synthesis. These MNps used as magnetically recyclable