5467-42-5Relevant articles and documents
Unusual nonoctahedral geometry with molybdenum oxoimido complexes containing η2-pyrazolate ligands
Arumuganathan,Volpe, Manuel,Harum, Bastian,Wurm, Dietmar,Belaj, Ferdinand,Moesch-Zanetti, Nadia C.
, p. 150 - 156 (2012)
The preparation and oxygen-atom-transfer (OAT) reactivity of oxoimido complexes [MoO(N-t-Bu)(t-Bu2-4-Rpz)2] [where R = H (1), Br (2), and Me (3); t-Bu2pz = 3,5-di-tert-butylpyrazolate] are reported. The reaction of the potassium salt of the respective pyrazolate ligands and the molybdenum oxoimido precursor, [MoO(N-t-Bu)Cl2(dme)] (dme = dimethoxyethane), in toluene afforded complexes 1-3 in good yields. The complexes were fully characterized by 1H and 13C NMR and IR spectroscopy, mass spectrometry, elemental analysis, and single-crystal X-ray crystallography. The solid-state structures reveal that, in each case, the molybdenum center is coordinated by one oxo, one N-t-Bu group, and two sterically demanding pyrazolate ligands via their two adjacent nitrogen atoms in an η2 fashion. Coordination around the metal center is severely distorted from octahedral and might be seen as closely approaching a distorted trigonal-prismatic geometry, which is relevant to the active site of dimethyl sulfoxide reductase in its oxidized form. The potential utility of all of the complexes 1-3 for OAT reactivity toward PMe3 at room temperature is examined, and plausible mechanistic pathways are explored by density functional theory calculations. Furthermore, the complexes reported here open a new and convenient entry into mixed oxoimidomolybdenum complexes.
Copper-catalyzed methylation of 1,3-diketones with tert-butyl peroxybenzoate
Zhou, Zhi-Hao,Li, Cheng-Kun,Zhou, Shao-Fang,Shoberu, Adedamola,Zou, Jian-Ping
, p. 2740 - 2746 (2017/04/18)
Copper-catalyzed radical methylation of 1,3-diketones with tert-butyl peroxybenzoate in air is described, providing a general pathway to α-methyl 1,3-diketones in moderate to good yields. This protocol has been scaled up to 50?g, and one of the synthesized products can be used in the synthesis of medicine, Rosuvastatin.
Method for preparing 2-methyl-1,3-dicarbonyl derivative
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Paragraph 0038, (2016/10/08)
The invention discloses a method for preparing a 2-methyl-1,3-dicarbonyl derivative. A 1,3-dicarbonyl derivative serves as an initiator, raw materials are easy to obtain, and a great variety of raw materials are available. The product obtained through the method has high type diversity and can be used directly or used for other further reactions. Besides, only organic peroxides and a catalytic amount of inorganic copper salt are used, so that cost is low. According to the method, a reaction is conducted in air, reaction conditions are mild, pollution is small, reaction time is short, the yield of the target product is high, reaction operation and aftertreatment are easy, and the method is suitable for industrial production.
Components and catalysts for the polymerization of olefins
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, (2008/06/13)
Disclosed is a catalyst for the polymerization of olefins, comprising the product of the reaction between an Al-alkyl compound and a solid catalyst component containing a magnesium halide in active form, a titanium compound and an electron-donor selected from the 1,3-diketones of formula: wherein the radicals R are the same or different, the radicals RIare the same or different, and R and RIare C1-C20 alkyl, C3-C20 cycloalkyl, C6-C12 aryl, C7-C20 arylalkyl or alkylaryl radicals or hydrogen, with the proviso that at least one of the R radicals is not hydrogen and can be bonded with the other R radical to form a cyclic structure, and at least one of the RIradicals, which are not bonded to one another to form a cyclic structure, is a branched alkyl, cycloalkyl or aryl radical, or is bonded to one or both R radicals to form a cyclic structure.
