Reaktion #805743

Reaktionsgleichung

1,3-DLa

1,3-Dilaurin

→

lauric acid vinyl ester

Lösungsmittel

glycerol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstige1,3 DLa was easily purified
2. 2
   Sonstigerecovered by crystallization in dry methanol at room temperature (RT)
3. 3
   Sonstigeat −20° C.
4. 4
   workup.ADDITIONwas added
5. 5
   workup.DISSOLUTIONto dissolve the FFA
6. 6
   Sonstigereaction rate with high yield of 1,3-DLa (65%)

Vorschrift

1,3 DLa was easily purified and recovered by crystallization in dry methanol at room temperature (RT) or in hexane at −20° C. (purity >98%). When lauric acid (La) was used as an acyl-donor, solvent was added to dissolve the FFA. Though the method as described in J. Am. Oil Chem. Soc., 1992, 69:955-960, allowed faster reaction rate with high yield of 1,3-DLa (65%), the highest yield (78%) of 1,3-DLa obtained from esterification between glycerol and lauric acid vinyl ester (LaVE) at 0° C. in a solvent-free condition catalyzed by CAL-B after 24 h, as illustrated in FIG. 14. FIG. 14 summarizes data of various synthesis of 1,3-dilaurin. Method1=esterification of glycerol and lauric acid in n-hexane at 0° C. catalyzed by CAL-B; Method2=esterification of glycerol and lauric acid vinyl ester in a solvent-free condition at 0° C. catalyzed by CAL-B; Method3 (Schneider's method)=esterification of glycerol (immobilized on silica gel) and lauric acid vinyl ester in MTBE at room temperature catalyzed by Lipozyme RM IM™ (Eurzyme, Dublin, Ireland). (DG=1,3-dilaurin, MG=1-monolaurin). LaVE, as acyl donor, allowed higher yield and faster reaction with less amount of MG than La.

Quelle