Synthesis of (E)-13-n-hexyloxacyclicotridec-10-en-2-ona (macrolactone) by transesterification of castor oil using heterogeneous catalysts based on zinc oxide
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This work reports the results obtained from the transesterification of castor oil with methanol under soft conditions(low temperature and atmospheric pressure), employing basic solids as Ba/ZnO, Mg/ZnO, and K/ZnO. It was foundthat the different systems exhibit high catalytic activity for the transformation of castor oil, but the Ba/ZnO systemshowed a highest tendency toward cyclation of ricinoleic acid to form a product known as macrolactone, namelly (E)-13-n-hexyloxacyclictridec-10-en-2-ona. The catalytic systems were analyzed through FT-IR, TEM, SEM, X-raydiffraction, temperature programmed reduction, analysis of surface area and the esters obtained from the reactionwere analyzed by gas chromatography coupled to mass spectroscopy (GC-MS).
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