反应详情

Crude pine oil (138.8 g; dehydrated by vacuum stripping and containing terpineol: 94.0%; fenchol: 0.29%; borneol: 3.66%) is heated with ME-810 (12.4 g; mixture of methyl fatty acid esters, available from Peter Cremer NA, LP) and methanesulfonic acid (1.0 g) at 100° C., 30-60 mm Hg for 10 h. GC of the reaction mixture shows: terpineol: 19.9%; borneol: 1.85%; terpene alcohol fatty esters: 2%. Limonene and terpinolene, formed by acid-catalyzed dehydration of terpineol, account for 65% of the reaction mixture. Distillation of the reaction mixture gives 108 g of material containing 1.85% of borneol and 18.5% of terpineol. This example shows that methanesulfonic acid is an unacceptable catalyst for the transesterification.