Convenient thionation of triglycerides with lawessons reagent |
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Authors: | Val rie Eychenne Zphirin Mouloungui |
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Affiliation: | (1) Laboratoire de Chimie Agro-Industrielle UA INRA 31A1010, Ecole Nationale Supérieure des Ingénieurs en Arts Chimiques, 118 route de Narbonne, 31077 Toulouse Cedex 4, France |
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Abstract: | Thionation using the Lawesson’s reagent (LR) led to quantitative and selective replacement of carbonyl groups (C=O) with thionocarbonyl
groups (C=S). Mixtures of thionotriglycerides were obtained by reaction of 2,4-bis (p-methoxyphenyl)-1,3-dithia-2,4-diphosphetane-2,4-disulfide in suspension with triglycerides (TG). With a molar ratio (LR)/(TG)=3∶2,
there was complete exchange of C=O with C=S in the carboxylic groups of the TG. The yield is over 90%. The two P=S ligands
in the LR confer a double reactivity, producing a high power of thionation. Fourier transform infrared spectroscopy was employed
for quantitative and qualitative characterization of the thionated TG and for monitoring the progress of partial or total
thionation as conditioned by the molar ratios of the starting compounds. Thus, with molar ration LR/TG of 0.108, 0.36, and
0.72, we obtained around 6, 20, and 40% of C=O conversion, respectively. |
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Keywords: | Infrared spectroscopy Lawesson’ s reagent thionation thionoesters thionotriglycerides triglycerides |
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