Pear Ester

Other comments :

In comparision to a pear note as Hexyl acetate, Pear Ester brings a juicy and natural fruit facet.

Stability :

Esters tend to form their corresponding acid in stability.

Uses in perfumery :

Pear Ester is used in apple and pear reconstitutions, in association with violet notes (Alpha-Ionone, Beta-Ionone), with exotic fruits notes. It can also bring the fruity aspect of a rose accord.

Year of discovery :

Data not available.

Isomerism :

Pear Ester is a purely isomeric component. It is the major component formed during its synthesis, also including ethyl trans-2-trans-4-decadienoate, its diastereoisomer. It is separated from this component by fractionnal distillation. Pear Ester also is a constitutionnal isomer of numerous other esters as Linalyl acetate, Geranyl acetate and Allyl Cyclohexyl Propionate.

Synthesis precursor :

Pear Ester is not used for the synthesis of another compound used in perfumery.

Natural availability :

Pear Ester is so-called because it is found in the odorous principle of pears, and particularly in Williams pears. It is also found in apple, grapes, durian and other fruits. It does not exist on a natural state for perfumery.

Synthesis route :

Pear Ester is prepared in three steps. Starting from cis-1-heptenyl, the first step is a conversion of this molecule into 1-heptenyl lithium, in the presence of a lithium and copper iodide complex. Reacting the intermediary product with Ethyl Propiolate leads to a mixture of Pear Ester (95% of the mixture) and trans-2-trans-4-decadienoate (5% of the mixture). The last step is a fractionnal distillation to purify Pear Ester. Pear Ester is also prepared on a biotechnological way. The latter is not detailled here.