486
S. Swami and R. Shrivastava
CoFe 2
O 4
OH
OH
OH
OH
OH
APTES
DCM, Reflux
24h
Dried at 100oC
CoFe 2
O 4
O
O
O
Si
NH 2
O
CHO
CoFe 2
O 4
O
O
O
Si
N
O
CoFe 2
O 4
O
O
O
Si
N
O
Cu
OAc
AcO
Cu(OAc) 2
Acetone, rt,
24hrs
Amine functionalized
cobalt ferrite
APTES = Amino propyl triethoxy silane
Scheme 15 Synthesis of CoFe 2 O 4 @SiO 2 -NH 2 -Furfural-Cu(OAc) 2
O
H
CH
NH2
NH4OAc
-H2O
NH2
H2N
HC
O
O
N
N
N
N
H
-2H2O
= CuFe2O4 MNPs
+
+
-H
+
Scheme 16 Plausible mechanism for the formation of substituted propynyl-1H-imidazoles
OH
OH
OH
(EtO) 3 SiCH 2 CH 2 CH 2 NH 2
O
O
O
Si
NH 2
O
O
O
Si
N
H
O
O
O
O
Si
N
H
O
N
CH 2 CH 2 NCH 2 CH 3
CH 2 CH 2 NCH 2 CH 3
CH 2 CH 3
CH 2 CH 3
EtOH/H2O
CH 2 CHCOCl
NH(CH 2 CH 2 N(Et) 2 ) 2
O
O
O
Si
N
H
O
N
CH 2 CH 2 NCH 2 CH 3
CH 2 CH 2 NCH 2 CH 3
CH 2 CH 3
CH 2 CH 3
Cu
Cl
Cl
CuCl 2
= Fe 3 O 4
Scheme 17 Synthesis of CuCl 2 /Fe 3 O 4 -TEDETA