An asymmetric Salamo-based Zn complex supported on Fe₃O₄ MNPs: a novel heterogeneous nanocatalyst for the silyl protection and deprotection of alcohols under mild conditions

Abstract

The synthesis and characterization of a novel nanomagnetic Zn complex are shown. The obtained Zn complex applied in the silyl protection and deprotection of alcohols under green conditions.

Nanomagnetic macrocyclic Schiff-base–Mn(ii) complex: an efficient heterogeneous catalyst for click approach synthesis of novel β-substitued-1,2,3-triazoles

“…1 represents the comparative FTIR spectra of (a) Fe 3 O 4 , (b) Fe 3 O 4 @CPTMS, (c) Fe 3 O 4 @PTMS-2,6-diacetylpyridine and (d) [Fe 3 O 4 @PAM-Schiff base-Mn][ClO 4 ]. The Fe 3 O 4 and Fe 3 O 4@CPTMS FT-IR results are exactly consistent with the previous reports 86,87. In the case of Fe 3 O 4 @PTMS-2,6-diacetylpyridine, the absorption band of (-NH) appeared as a singlet peak at 3694 cm À1 from the 2,6-diacetylpyridine moiety and C-Cl peak disappeared.…”

“…The Fe 3 O 4 and Fe 3 O 4 @CPTMS FT-IR results are exactly consistent with the previous reports. 86,87 In the case of Fe 3 O 4 @PTMS–2,6-diacetylpyridine, the absorption band of (–NH) appeared as a singlet peak at 3694 cm −1 from the 2,6-diacetylpyridine moiety and C–Cl peak disappeared. Moreover, the absorption band at 1726 cm −1 is related to the acetyl CO groups, and absorption bands at 1550–1650 cm −1 are related to the aromatic CC bonds.…”

A novel Hercynite‐supported tetradentate Schiff base complex of manganese catalyzed one‐pot annulation reactions

“…Notably, the high shifts on the CN peak in the [Hercynite@SiO 2 –Schiff base–Mn(II)] (Figure 1f) to lower wavenumbers—in comparison to Hercynite@SiO 2 –Schiff base—are due to π backbonding effect that indicates the proper complexation of Mn(II) with the azomethine nitrogen atoms of the Schiff base ligand, confirming the successful formation of [Schiff base–Mn(II)] catalytic complex over Hercynite@SiO 2 nanomagnetic core–shell support. [ 66 ]…”

“…Notably, the high shifts on the C N peak in the [Hercynite@SiO 2 -Schiff base-Mn(II)] (Figure 1f) to lower wavenumbers-in comparison to Hercynite@SiO 2 -Schiff base-are due to π backbonding effect that indicates the proper complexation of Mn(II) with the azomethine nitrogen atoms of the Schiff base ligand, confirming the successful formation of [Schiff base-Mn(II)] catalytic complex over Hercynite@-SiO 2 nanomagnetic core-shell support. [66] The obtained powder X-ray diffraction (P-XRD) patterns of Hercynite, Hercynite@SiO 2 , and [Hercynite@-SiO 2 -Schiff base-Mn(II)] are shown in Figure 2. All of the P-XRD patterns are in accord with the PXRD pattern of the spinel-type FeAl 2 O 4 MNPs.…”

Fe3O4 supported [Cu(ii)(met)(pro-H)2] complex as a novel nanomagnetic catalytic system for room temperature C–O coupling reactions

“…1, the Fe 3 O 4 , Fe 3 O 4 @CPTMS and Fe 3 O 4 @Met FT-IR spectra perfectly match with the earlier reports on the ngerprint of these samples. 41,42 The peaks appearing at 580 cm −1 and 630 cm −1 are attributed to characteristic stretching vibration mode of metal-oxygen (Fe-O) bonds. 43 Moreover, the faint peak at 810 cm −1 and the sharp and broad absorption peaks at around 960 cm −1 to −1200 cm −1 are attributed to symmetric and asymmetric Si-O-Si bond stretches, respectively.…”