“…[94,95] If glycerol is immobilized on silica gel, the esterification runs surprisingly smoothly in aprotic solvents such as nhexane or tert-butylmethyl ether in the presence of different lipases and acyl donors (free fatty acids, fatty acid methyl esters, vinyl esters, triglycerides, and so forth). [100] If the 1(3)-sn-monoglycerides 68 are prepared by this method, they must be selectively separated from the reaction mixture, since they are very readily esterified by the lipases to 1,3-sn-diglycerides. [96,99] Because of their ready accessibility, up to the kilogram scale, and their high purity and stability, these 1,3-sn-diglycerides represent interesting building blocks for further surfactant compounds (for exam-Scheme 27.…”