- DISCOTIC MESOPHASES OF DIRHODIUM TETRACARBOXYLATES
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The synthesis of dirhodium tetraoctaonate and dirhodium tetradodecanoate is described.Both complexes exhibit a thermotropic discotic mesophase that was characterized by optical microscopy, differential scanning calorimetry, and X-ray diffraction.A two-dimensional hexagonal columnar lattice was observed in which each column is made of stacked metal-metal bonded dirhodium units with a period of ca. 4.6 Angstroem.
- Giround-Godquin, Anne-Marie,Marchon, Jean-Claude,Guillon, Daniel,Skoulios, Antoine
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- Scalable Synthesis of Esp and Rhodium(II) Carboxylates from Acetylacetone and RhCl3· xH2O
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Rhodium(II) carboxylates are privileged catalysts for the most challenging carbene-, nitrene-, and oxo-transfer reactions. In this work, we address the strategic challenges of current organic and inorganic synthesis methods to access these rhodium(II) complexes through an oxidative rearrangement strategy and a reductive ligation reaction. These studies illustrate the multiple benefits of oxidative rearrangement in the process-scale synthesis of congested carboxylates over nitrile anion alkylation reactions, and the impressive effect of inorganic additives in the reductive ligation of rhodium(III) salts.
- Martínez-Castro, Elisa,Mendoza, Abraham,Suárez-Pantiga, Samuel
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supporting information
p. 1207 - 1212
(2020/07/15)
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- Synthesis method capable of realizing mass production of rhodium octanoate dimer
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The invention discloses a synthesis method capable of realizing mass production of rhodium octanoate dimer. The synthesis method is characterized by comprising the following steps: adding an alkalinesolution into certain amount of octanoic acid to adjust the pH value to 4.0-6.5; adding an aqueous solution of rhodium chloride; heating to certain temperature and cooling naturally; after the temperature is reduced to certain temperature, adding the alkaline solution to adjust the pH value to 9-13; stirring, filtering and washing with hot water for three times; after the product is cooled, washing twice with cold ethanol water, and drying to obtain grass-green rhodium octanoate dimer. The synthesis method of rhodium octanoate dimer disclosed by the invention has the advantages of high stability, high yield (larger than 97%), high product purity (larger than 99%) and obvious economic and environment-friendly benefits.
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Paragraph 0013-0016
(2019/01/16)
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- Method for preparing dual-core rhodium (II) carboxylate
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The invention relates to a method for preparing dual-core rhodium (II) carboxylate. The method comprises two steps of (1), adding rhodium (II) acetate into a sodium carbonate aqueous solution, agitating for reacting and obtaining sodium dirhodium tetracarbonate from a bluish-violet product; (2), adding the sodium dirhodium tetracarbonate into a proper amount of water, agitating, adding a proper amount of carboxylic acid, agitating for reacting, and afterwards, processing products according to the different solubility of products by adopting different methods. The method has the following advantages that 1), a reaction medium in the method is water, and toxic and harmful solvents which are necessarily used in a direct substitution reaction do not need to be used; 2), as the method firstly replaces an acetate radical, which is more difficult to replace, with sodium carbonate which is quite low in price, the generated sodium dirhodium tetracarbonate is also quite easily replaced with other carboxylic acid; 3), the purity of the prepared dual-core rhodium carboxylate is higher than that in the direct substitution method, and 4), the reaction time in the method is obviously shortened, the reaction temperature is lower, and therefore, the method helps to reduce energy and manpower cost, and is suitable for industrialized production.
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Paragraph 0022; 0023
(2018/07/06)
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