Ordered Mesoporous and Microporous Molecular Sieves Functionalized with Transition Metal Complexes as Catalysts for Selective Organic Transformations

Abstract

instance, by Venuto, Ho ¨lderich, and Jacobs for zeolite reactions, 7 or by Brunel, Corma, and Ying for the mesoporous molecular sieves; 8 however, comparison with the state-of-the-art at the end of 2001 shows that the field has rapidly expanded over the past few years.

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

“…15,[28][29][30] Mesoporous transition metal oxides with d-shell electrons confined to nanosized walls, redox active internal surfaces, and connected pore networks demonstrate extremely fascinating prospects for use in catalysis, energy conversion and storage, as well as gas sensing, adsorption, and separation. [31][32][33] The use of soft templates (e.g., chelating agents and surfactants) and hard templates (e.g., mesoporous materials and carbon nanotubes) has led to some wonderful contributions. [34][35][36] Compared with soft templates, hard templates have some advantages for the preparation of ordered mesoporous arrays.…”

Covalent immobilization of the Jacobsen catalyst on mesoporous phenolic polymer: A highly enantioselective and stable asymmetric epoxidation catalyst

“…These strategies have proven to be efficient, yet for covalent immobilization the original structure of the manganese complex is modified or multiple synthetic steps and structural changes to the parent catalyst structure and support are required. Intensive research on the heterogenization of salen-type and other metal complexes has been performed by De Vos et al, being particularly successful in the field of zeolite encapsulation and silica grafting [20][21][22] . Various metallosalen complexes and analogues have been anchored successfully on hybrid porous materials such as ordered mesoporous organosilicas (PMOs) and metal organic frameworks (MOFs) [23] .…”

Covalent Heterogenization of a Discrete Mn(II) Bis-Phen Complex by a Metal-Template/Metal-Exchange Method: An Epoxidation Catalyst with Enhanced Reactivity

“…7 For these reasons, much attention has focused on the development of heterogeneous catalysts for epoxidation reactions. [7][8][9][10][11][12] The first covalently attached epoxidation catalysts involved titanium embedded in silica supports 13 and many variations on this theme of Lewis acid transition metals (Ti IV , W VI , Mo VI , V V , Cr VI , Zr IV ) incorporated into silica supports have followed over the past 40 years. E-mail: stack@stanford.edu.…”

“…[8][9][10][11][25][26][27] Few of these materials, however, maintain high reactivity with terminal olefins and are even less effective with more electron-deficient olefins such as α,β-unsaturated ketones and esters. The few heterogenized transition metal catalysts that epoxidize electron-deficient olefins, such as a covalently tethered Ru-porphyrin system, 24 have limitations including multiple reaction byproducts and a narrow substrate scope.…”