Geranyl acetate coriander

In Coriandre (Couturier 1973) the top note is of coriander, ylang, styrallyl acetate, and undecylenic aldehyde, with geranium as part of the rose note. The type of rose base, which probably makes up some 10% of the formula, is a classic combination of phenylethyl alcohol, citronellol, geraniol, geranyl acetate, honey notes such as ethyl phenylacetate and phenylethyl phenylacetate, phenylacetaldehyde, rosatol, camomile, and violet leaf. Apart from hydroxycitronellal, Lyral, and phenylacetaldehyde glyceroacetal add to the muguet character. 

Polshkov (2001) studied the effect of storage time and condition on the composition of coriander oil after 1, 2, 4, 6, 9 and 12 months by GC-MS analysis. In the fresh specimen, the monoterpene hydrocarbons, y-terpinene and a-pinene, were detected in considerable amounts and camphor, linalyl acetate and geranyl acetate in smaller amounts. Aldehydes (neral, 2-decenal and undecenal) were also found. During 1 year of storage in the dark, the composition of the oil changed... 

Composition ISO lists 65-78% linalool, a-pinene (3-7%), y-terpinene (2-7%), camphor (4-6%), limonene (2-5%), geranyl acetate (1-3.5%), geraniol (0.5-3%), a-terpi-neol (0.5-1.5%) and myrcene (0.5-1.5%) [75] as the main components of coriander fruit oil. Further constituents can be linalyl acetate, bomeol, citronellol, nerol, ter-pinene-4-ol, additionally monoterpene hydrocarbons and aliphatic aldehydes [76, 77], The latter are the main components of the weed (cilantro) oil and their amount is higher in unripe coriander fruits. E-2-tridecanal is held responsible for the bug-like odour of these unripe fruits ( bug dill ) [78], Lamparsky and Klimes have performed an exhaustive analysis which also led to the detection of interesting heterocyclic trace constituents [79],... 

Allylic hydrolysis of geranyl pyrophosphate produces linalool (92). Like geraniol, linalool occurs widely in nature. The richest source is ho leaf, the oil of which can contain well over 90% linalool. Other rich sources include linaloe, rosewood, coriander, freesia, and honeysuckle. Its acetate is also frequently encountered and is a signi cant contributor to the odors of lavender and citrus leaf oils. 

Terpenoid esters occur in various fruits and many spices. Examples are the fairly widespread geranyl (8-80) and neryl acetates (8-81), which are components of citrus oils and odours of some spices (such as coriander). 

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