2566-97-4Relevant articles and documents
Branched alkyl sulfonate anionic surfactant and preparation process thereof
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Paragraph 0090-0091, (2021/02/10)
The invention discloses a branched alkyl sulfonate anionic surfactant and a preparation process thereof, and belongs to the field of fine chemical surfactants. The method comprises the steps of (1) conducting a esterification carboxyl-terminated reaction, specifically, catalyzing oleic acid or linoleic acid and fatty alcohol to be subjected to esterification reaction by adopting organic acid as acatalyst to prepare an alkyl oleate or alkyl linoleate compound; and (2) conducting a double bond addition sulfonation reaction, specifically, in the presence of the catalyst, carrying out sulfonationreaction with the alkyl oleate compound or the alkyl linoleate compound obtained in the step (1) by taking low-carbon alcohol and deionized water as solvents and sodium hydrogen sulfite as a sulfonation reagent to prepare the branched alkyl sulfonate anionic surfactant. The synthesized branched alkyl sulfonate anionic surfactant product can effectively reduce the surface tension of an aqueous solution, and is good in solubility, large in initial foaming amount, high in defoaming speed and excellent in surfactant performance. The method has the advantages of simple process operation, few sidereactions, energy saving and environmental protection.
The Reaction of Thiyl Radical with Methyl Linoleate: Completing the Picture
Chatgilialoglu, Chryssostomos,Ferreri, Carla,Guerra, Maurizio,Samadi, Abdelouahid,Bowry, Vincent W.
supporting information, p. 4704 - 4714 (2017/04/11)
Cis lipids can be converted by thiols and free radicals into trans lipids, which are therefore a valuable tell-tale for free radical activity in the cell’s lipidome. Our previous studies have shown that polyunsaturated lipids are isomerized by alkanethiyl radicals (S?) in a cycle propagated by reversible double-bond addition and terminated by radical H-abstraction from the lipid. A critical flaw in this picture has long been that the reported lipid abstraction rate from radiolysis studies is faster than addition-isomerization, implying that the “cycle” must be terminating faster than it is propagating! Herein, we resolved this longstanding puzzle by combining a detailed product analysis, with reinvestigation of the time-resolved kinetics, DFT calculations of the indicated pathways, and reformulation of the radical-stasis equations. We have determined thiol-coupled products in dilute solutions arise mainly from addition to the inside position of the bisallylic group, followed by rapid intramolecular H? transfer, yielding allylic radicals (LZZ + S? ? SL? → SL′?) that are slowly reduced by thiol (SL′? + SH → SL′H + S?). The first-order grow-in rate of the L-H? signal (kexp280nm) may therefore be dominated by the addition-H-translocation rather than slower direct H?-abstraction. Steady-state kinetic analysis of the new mechanism is consistent with products and the rates and trends for polyunsaturated fatty acids (PUFAs), monounsaturated fatty acids (MUFAs), and mixtures, with and without physiological [O2]. Implications of this new paradigm for the thiol-ene reactivity fall in an interdisciplinary research area spanning from synthetic applications to metabolomics.
ADDUCTS OF LEVULINIC DERIVATIVES WITH EPOXIDIZED FATTY ACID ESTERS AND USES THEREOF
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Page/Page column 19-20, (2010/11/27)
The present disclosure relates to methods of preparation of compounds resulting from the reaction of levulinic esters and epoxidized unsaturated fatty acid esters. The compounds are useful as renewable biomass-based plasticizers for a variety of polymers. Mono-, di- and tri-ketal adducts formed in a reaction between alkyl esters of levulinate and epoxidized unsaturated fatty acid esters derived from vegetable oils are also disclosed.
