943-93-1Relevant articles and documents
Modification of MnFe2O4 surface by Mo (VI) pyridylimine complex as an efficient nanocatalyst for (ep)oxidation of alkenes and sulfides
Bouzari, Narges,Bezaatpour, Abolfazl,Babaei, Behnam,Amiri, Mandana,Boukherroub, Rabah,Szunerits, Sabine
, (2021/03/04)
In this current paper, we report a new type of heterogeneous molybdenum (+6) complex, prepared by covalent grafting of cis-dioxo?molybdenum (VI) pyridylimine complex on the surface of MnFe2O4 nanoparticles (NP) and characterized using various physicochemical techniques. The recyclable prepared nanocatalyst was tested for sulfoxidation of sulfides and epoxidation of alkenes under solvent-free condition. The catalyst exhibited high turnover frequency for the oxidization of cyclooctene and cyclohexene (10,850 h?1) and thioanisole and dimethyl sulfide (41,250 h?1). The synthesized catalyst was found highly efficient, retrievable and eco-friendly catalyst for the (ep)oxidation of alkenes and sulfides in excellent yields in a short time. Furthermore, the synthesized nanocatalyst can be reused for four runs without apparent loss of its catalytic activity in the oxidation reaction.
Mo catalyst and application thereof in preparation of 9,10-epoxy-1, 5-cyclododecene
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Paragraph 0079-0103, (2020/10/05)
The invention discloses a Mo catalyst and application thereof in preparation of 9,10-epoxy-1, 5-cyclododecene. The preparation method comprises the following steps: mixing the Mo catalyst and a tert-butyl hydroperoxide/tert-butyl alcohol system, and carrying out preheating to a reaction temperature; separately introducing the preheated mixture of the Mo catalyst and the tert-butyl hydroperoxide/tert-butyl alcohol system and a cocatalyst into a reactive distillation tower, and carrying out a contact reaction on the introduced substances and 1,5,9-cyclododecene in the reactive distillation tower; and discharging the product 9,10-epoxy-1, 5-cyclododecene from the bottom of the reactive distillation tower, and extracting a byproduct tert-butyl alcohol from the top of the reactive distillationtower. The preparation method provided by the invention overcomes the defects of poor solubility, easy precipitation and poor stability of traditional Mo catalysts; and meanwhile, reaction selectivityis improved, and a post-treatment process is simplified.
Making Fe(BPBP)-catalyzed C-H and CC oxidations more affordable
Yazerski, Vital A.,Spannring, Peter,Gatineau, David,Woerde, Charlotte H.M.,Wieclawska, Sara M.,Lutz, Martin,Kleijn, Henk,Klein Gebbink, Robertus J.M.
supporting information, p. 2062 - 2070 (2014/03/21)
The limited availability of catalytic reaction components may represent a major hurdle for the practical application of many catalytic procedures in organic synthesis. In this work, we demonstrate that the mixture of isomeric iron complexes [Fe(OTf)2(mix-BPBP)] (mix-1), composed of Λ-α-[Fe(OTf)2(S,S-BPBP)] (S,S-1), Δ-α- [Fe(OTf)2(R,R-BPBP)] (R,R-1) and Δ/Λ-β-[Fe(OTf) 2(R,S-BPBP)] (R,S-1), is a practical catalyst for the preparative oxidation of various aliphatic compounds including model hydrocarbons and optically pure natural products using hydrogen peroxide as an oxidant. Among the species present in mix-1, S,S-1 and R,R-1 are catalytically active, act independently and represent ca. 75% of mix-1. The remaining 25% of mix-1 is represented by mesomeric R,S-1 which nominally plays a spectator role in both C-H and C=C bond oxidation reactions. Overall, this mixture of iron complexes displays the same catalytic profile as its enantiopure components that have been previously used separately in sp3 C-H oxidations. In contrast to them, mix-1 is readily available on a multi-gram scale via two high yielding steps from crude dl/meso-2,2′-bipyrrolidine. Next to its use in C-H oxidation, mix-1 is active in chemospecific epoxidation reactions, which has allowed us to develop a practical catalytic protocol for the synthesis of epoxides.
