- VOC fluorescent sensing material based on cuprous complexes
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The invention discloses a VOC fluorescent sensing material based on cuprous complexes, a preparation method of the VOC fluorescent sensing material and VOC fluorescent sensing application. A luminouscomplex is prepared by complexing univalent copper salts and ligands; the molecular structure is Cu(Xantphos)I; in the formula, the Xantphos is an electrically neutral diphosphine ligand of 4,5-bis(diphenylphospheno)-9,9-dimethylxanthene; I is a halogen iodide ligand. The complex has the advantages of easy purification of small molecules, and also has high thermal stability. The material is obtained by direct mixing and reaction on the CuI and the ligand acetonitrile solution and dichloromethane solution. The complex has the advantages that the process is simple and convenient; the equipment is simple; the raw materials can be easily obtained; the cost is low, and the like. The material can be used as the VOC fluorescent sensing material, and has the good selective fluorescent response tomethylamine steam.
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Paragraph 0025
(2019/07/01)
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- Efficient Copper-Catalyzed Multicomponent Synthesis of N-Acyl Amidines via Acyl Nitrenes
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Direct synthetic routes to amidines are desired, as they are widely present in many biologically active compounds and organometallic complexes. N-Acyl amidines in particular can be used as a starting material for the synthesis of heterocycles and have several other applications. Here, we describe a fast and practical copper-catalyzed three-component reaction of aryl acetylenes, amines, and easily accessible 1,4,2-dioxazol-5-ones to N-acyl amidines, generating CO2 as the only byproduct. Transformation of the dioxazolones on the Cu catalyst generates acyl nitrenes that rapidly insert into the copper acetylide Cu-C bond rather than undergoing an undesired Curtius rearrangement. For nonaromatic dioxazolones, [Cu(OAc)(Xantphos)] is a superior catalyst for this transformation, leading to full substrate conversion within 10 min. For the direct synthesis of N-benzoyl amidine derivatives from aromatic dioxazolones, [Cu(OAc)(Xantphos)] proved to be inactive, but moderate to good yields were obtained when using simple copper(I) iodide (CuI) as the catalyst. Mechanistic studies revealed the aerobic instability of one of the intermediates at low catalyst loadings, but the reaction could still be performed in air for most substrates when using catalyst loadings of 5 mol %. The herein reported procedure not only provides a new, practical, and direct route to N-acyl amidines but also represents a new type of C-N bond formation.
- Van Vliet, Kaj M.,Polak, Lara H.,Siegler, Maxime A.,Van Der Vlugt, Jarl Ivar,Guerra, Célia Fonseca,De Bruin, Bas
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supporting information
p. 15240 - 15249
(2019/10/19)
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- A highly efficient palladium/copper cocatalytic system for direct arylation of heteroarenes: An unexpected effect of Cu(xantphos)I
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"Chemical equation presented" Heteroarenes are important structural moieties in many chemical industry fields. A highly efficient Pd/Cu-catalyzed C-H arylation method for a range of heterocycles has been discovered. It was found that the key to the success of this transformation is a combination of a palladium catalyst and a well-defined copper cocatalyst. The efficiency and low loadings of catalyst (0.25 mol %) and cocatalyst (1 mol %) together with the mild reaction conditions demonstrate this method to be practically useful and mechanistically interesting.
- Huang, Jinkun,Chan, Johann,Chen, Ying,Borths, Christopher J.,Baucom, Kyle D.,Larsen, Robert D.,Faul, Margaret M.
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p. 3674 - 3675
(2010/05/15)
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