Abstract
Thermal properties of linear citronellyl diesters were studied by TG/DSC/FTIR/QMS-coupled method in inert and oxidative atmospheres. The diesters decompose in one main step in inert atmosphere. As main pyrolysis products, the formation of mainly monoterpene hydrocarbons, acid anhydrides, monoacids, cyclic ketones, aldehyde fragments, carbon dioxide, and water was observed. It was indicated on the ester and O-citronellyl bonds cleavage, partial decarboxylation, and elimination of water from formed dicarboxylic acids during their pyrolysis. The decomposition in air runs in two steps. The first step was connected with the creation of monoterpene hydrocarbons, monoacids, cyclic ketones, aldehydes, carbon dioxide, carbon monoxide, and water. In the second step of decomposition, mainly carbon dioxide and water were produced. It was testified to ester and O-citronellyl bonds cleavage, partial oxygenation, and decarboxylation process of the primary formed decomposition products.
Highlights
Citronellol (3,7-dimethyl-6-octen-1-ol) is a natural, acyclic, primary terpene alcohol with one carbon–carbon double bond in the structure
The conversion of terpene alcohol was higher than 98 %, the conversion of carboxylic groups was higher than 97 %, respectively (Table 1)
Thermal stability of citronellyl diesters was higher in inert than in oxidative atmosphere
Summary
Citronellol (3,7-dimethyl-6-octen-1-ol) is a natural, acyclic, primary terpene alcohol with one carbon–carbon double bond in the structure. Citronellol is a colorless liquid with an agreeable, sweet roselike odor. It is found in Esters of short chain fatty acids and primary, terpene alcohols e.g., geraniol, nerol, and citronellol are commonly known and applied in the industry as a flavor and fragrance compounds. The most popular diesters are the esterification products of succinic anhydride and geraniol or nerol [9, 10]. Those esters are obtained by traditional methods like esterification process without or with the use of strong acid catalyst or amine catalyzed [11, 12]
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