19759-75-2Relevant academic research and scientific papers
Preparation method of antioxidant 412S pentaerythritol tetra(3-lauryl thiopropionate)
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Paragraph 0029-0031; 0039-0041; 0049-0051, (2021/02/10)
The invention provides a preparation method of an antioxidant 412S pentaerythritol tetra(3-lauryl thiopropionate), which comprises the following steps: reacting n-dodecyl mercaptan (NDM) with methyl acrylate (MA) to prepare n-dodecyl thiopropionate, and carrying out transesterification with pentaerythritol to obtain the antioxidant 412S. In the two steps of reactions, a three-coordination boride cationic chloroaluminate ionic liquid is used as a catalyst, the preparation method is suitable for large-scale production of an oxidizing agent 412S, cost saving is realized through effective recoveryand circulation of a solvent, and the whole reaction process is green and environment-friendly through centralized treatment of waste gas and the like.
Carboxamide and amine compounds as well as preparation method and applications thereof
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Paragraph 0094; 0095; 0096; 0997, (2016/10/08)
The invention discloses carboxamide and amine compounds as well as a preparation method and applications thereof as stable and efficient antioxidation sterilizers, belonging to the technical field of invention and preparation of novel antioxidation sterilizer compounds. All the compounds disclosed by the invention are stable antioxidation sterilizers which have different stable structures formed by connecting carboxamide and amine bonds, and meanwhile, products having different lengths of aliphatic chains are produced by adjusting an n value, such that the products can be completely matched with a specific high polymer material in performance, the problems that a micromolecular stabilizer is volatilized fast, easily drawn from high polymer materials and the like are solved, the service life of the material is greatly prolonged, and the carboxamide and amine compounds have relatively strong and durable high polymer material protection performance. Compared with the prior art, the stable high polymer antioxidants disclosed by the invention have relatively high capabilities of resisting hydrolysis, acidolysis, alkaline hydrolysis, degradation in a chemical pollution environment, and these performances provides a new better antioxidant selection range for the development of modern new materials. Furthermore, this kind of carboxamide and amine compounds also have the characteristics of difficulty in volatilization, good matching performance with high polymer materials, good high polymer protection capability, good environmental performance, attractive appearance and durability, low cost and the like.
Direct Michael addition to electron-deficient alkenes using diorganyl dichalcogenides (Te/S) and NaBH4/PEG-400
Perin, Gelson,Borges, Elton L.,Peglow, Thiago J.,Lenard?o, Eder J.
supporting information, p. 5652 - 5655 (2014/12/11)
Nucleophilic species of tellurium and sulfur were generated in situ from the reaction of the respective diorganyl dichalcogenides with NaBH4in PEG-400 as solvent and selectively added to electron-deficient alkenes. Chalcogenolate anions were directly added at mild conditions by this simple procedure and in all cases furnished the respective Michael adducts in short reaction times and good yields.
Borax as an efficient metal-free catalyst for hetero-Michael reactions in an aqueous medium
Hussain, Sahid,Bharadwaj, Saitanya K.,Chaudhuri, Mihir K.,Kalita, Harjyoti
, p. 374 - 378 (2007/10/03)
Borax, a naturally occurring material, very efficiently catalyzed the conjugate addition of thiols, dithiols and amines to α,β-unsaturated ketones, nitriles, amides, aldehydes and esters in an aqueous medium to afford the corresponding Michael adducts in good yields at room temperature. Recycling of the catalyst and scaling up of the reactions are important attributes of this catalysis. The reactions of thiols and dithiols were relatively more facile than those of the corresponding amines. Wiley-VCH Verlag GmbH & Co. KGaA, 2007.
Thioesters and antioxidant compositions containing the same
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, (2008/06/13)
The present invention relates to thioesters having the structural formula: STR1 wherein Rx is selected from the group of formulae consisting of: STR2 R1, R2 and R3 are independently selected from the group of radicals consisting of hydrogen or methyl; R4 and R5 are independently selected from the group of radicals consisting of hydrogen, alkyls having 1 to 18 carbon atoms, aryls having 6 to 10 carbon atoms, aralkyls having 7 to 9 carbon atoms, and radicals of the formula: STR3 and R6 is selected from the group of radials consisting of alkyls having 1 to 24 carbon atoms, aryls having 6 to 12 carbon atoms and aralkyls having 7 to 12 carbon atoms. These thioesters are particularly useful as a synergist for conventional phenolic and amine antioxidants.
