Improvement of Physicochemical Characteristics of Monoepoxide Linoleic Acid Ring Opening for Biolubricant Base Oil

Table 6

The main signals present in ¹³C NMR functional groups of MEOA and HYOOA.

δ (ppm) of MEOA^a	δ (ppm) of HYOOA^b	Assignment
22.69–34.15	25.76–34.38	Aliphatic carbons
54.59–57.29	—	() Epoxide groups
—	64.41	–OH alcohol
124.02–132.89	127.90–130.57	–CH=CH– olefinic carbons
—	174.01	C=O ester
179.32	178.11	C=O carboxylic acid

Notes: monoepoxide linoleic acid (a); 9,12-Hydroxy-10,13-oleioxy-12,9-octadecanoic acid (b).