0 Hits

  • Previous / Next

You are using Science Of Synthesis as a Guest.
Please login or sign up for a free trial to access the full content. 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]

Meeeee 88 Meeee-Meee-Meeeeeeee Meeeeeeeeeeeeeeeeeee[‌888‌‌888‌]

Mee eeee-eeeee eeeee eeeeee e eeeeee eeeee eeeee eeeeeeeeee eeeeee eee eeeeeeeeee eeeee eee ee eee eeeeeeee eeeeeeeeee ee eeeeeeeeeeee eeeeee eee eee eeeee eeeeeee eeeee eeee eeeeee eeeeeeeeee. Meeeeeeee eeeeee eeeeee 888 eeeeeee eeeeeeeee eeeeeeeeeeeeeeeeeee ee eeeeeee eeeeeeeeeee eeee eeeeeeeee eeee-eeeeeeee ee eeeeeee eeeee ee eeee ee eeeeeeeee eeeeee (Meeeee 88).[‌888‌] M eeeeeeeeee eeeeeeeee eeeeeeeeeeee eeeeee ee eeeee eeeeee ee eeeeeee ee eeeeeeeee eeeeeeeee eeeeeeeee eeeeeeeeeeeeeeeeeee.[‌888‌] Me eeeeeeeee eee eeeeeeeeeee ee eee eeeeeeee ee eeee eeeeee, ee ee eeeeeeee ee eeeeeeeeeee eeeeee e eeeeeee eeeeeee ee eee eeeeeeee ee eeeeeeeee eee eeeeeeee eeeeeeee eee ee eeeeee e eeeeeeeee eeeeeee ee eee eeeeeeee ee eeeeeeee eeeeeeee. Meee eeeeeeeeeee eee eeee ee eeeeeeee eee eee eeee eeeeeee eeeeeeee ee eee eeeeee eeeeeeeee ee eee β-eeeeeeeee ee eee eeeeeeee eeeeee (Meeeee 88).

Meee eee eeeeeeeeee ee eeeeeeee eee eeeeeeee, eeeeeeeeeeeeeeeeeee eee eeee ee eeeeeeeee ee eeeeeeee eeeee eeeeee, eeee ee 8-(eeeeeeeeeeeee)eeeeeeee (Meeeee 88). Meeeee eee eeeeeeeee ee eeeeee, eeeeeeeeee eeeeeeeee eeeeeeeeeeeee eeee eeeee- eee eee-eeee eeeeeeeee, Meeeeee eee ee-eeeeeee eeeee eeee eee eeeeee eeeeeeeee ()-eeeeeee ee eeeeee eeeeeeee ee β-eee eeeee 888 eeeeeee eeeeeeeeeeeeeeeeeee eeeeeeeee ee 8-(eeeeeeeeeeeee)eeeeeeee (Meeeee 88).[‌888‌] β-Mee eeeeee 888 eee ee eeeeeeeeeeeeeee eeee eeeeeee eeeeeeee (eeeeeeee, eeeeeeee eeeeeeee, eee eeeeeeee eeee eeee- ee eeee-eeeeeeeee eeeeeeeeeeee) eeeee eeeeeeeee eeee (eeeeeeeeeeee)eeeeeeeeee eeeeee eee ee e eeeeeeee ee eeeeeeeee eeeeee (Meeeee 88).[‌888‌] Meee eeeeeeee eee ee eeeeeeeeeee eeeeeeee eeee eeee eeee eeeee eeeeeee eee eeeeeeeeeeee eeeee eeeeeeeee.

Meeeee 88 Meeee-Meeeeeeee Meeeeeeeeeeeeeeeeeee[‌888‌,‌888‌]

Meeeeeeeeeee Meeeeeeee

8-Meeeeeeeeeee 8-Meeeeeeeeeeeee 888; Meeeeee Meeeeeeee:[‌888‌]

Meeeee-eeeeee MeM (8.88e, 8.8eeee) eee eeeeeeeee ee eeeee MMM (88eM) eee eeeee ee MM(MM8)8MMe (8.8e, 8eeee) ee MMM (8eM). Mee eeeeeee eee eeeeeee eee 8e ee ee, 888 (8eeee) ee MMM (8eM) eee eeeee, eee eee eeeeeeeee eeeeeee eee eeeeeeee eee 88e. Mee eeeeeee eee eeeeeee eeeee eeeeeee eeeeeeee, eee eee eeeeeee eee eeeeeeeee ee MeMMe (888eM), eeeeee eeee M8M (8×88eM) eee eeeee (88eM), eee eeeee (Me8MM8). Mee eeeee eeeeeee eee eeeeeeeeeeeeeee (eeeeee eee, MeMMe/eeeeee 8:8) eee eeeeeeeee (Meeeeeeee).