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20.5.1.7.13.2.4 Variation 4: By Bases

DOI: 10.1055/sos-SD-020-00774

Zhang, M.; Hanson, P. R.Science of Synthesis, (200720931.

Like acid catalysts, bases have also been utilized as transesterification catalysts. Metal (Li, Na, K, Zn, etc.) salts make up the main type of base catalyst used for this purpose. Sodium hydride mediates the reaction between 5-ethoxypentan-1-ol and alkyl 5-halopentanoates 249 to furnish transesterification products 250 (Scheme 86).[‌361‌] Palm oil polyol esters are prepared by sodium methoxide catalyzed transesterification of fractionated palm oil methyl esters with trimethylolpropane; conversion into palm trimethylolpropane triesters is nearly complete (98% w/w).[‌362‌]

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