Diesters Biolubricant Base Oil: Synthesis, Optimization, Characterization, and Physicochemical Characteristics

Table 6

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

δ (ppm) of HYOOA^a	δ (ppm) of OLHYOOD^b	Assignment
25.76–34.38	25.75–34.37	Aliphatic Carbons
64.41	64.37	–OH Alcohol
127.90–130.57	129.61–130.46	–CH=CH– Olefinic carbons
174.01	173.93	C=O Ester
178.11	—	C=O Carboxylic acid

Notes: 9,12-hydroxy-10,13-oleioxy-12,9-octadecanoic acid (a); 9(12)-hydroxy-10(13)-oleioxy-12(9)-octadecanoate (b).