Menthol, molecular model

Many pairs of enantiomers are reported to exemplify the enantioselectivity of the sense of smell. (5)-(+)-Linalool from the oil of Coriander has a flowery smell with a touch of citrus this contrasts with the (if)-(-)-enantiomer from the oils of Rose, Neroli and Lavender, with a woody lavender odor (lif,3i ,4S)-(-)-Menthol (shown as molecular model in Fig. 14) smells and tastes sweet and minty, cooling and refreshing, and therefore is widely used in perfumery and confectionery. In contrast, the (15,35,4i )-(-l-)-enantiomer radiates a more herby, weaker minty and less refreshing odor... 

From these results, and from the reported extrapolated values of 276 °C (syndiotactic) and 126 °C (isotactic) for the glass transition temperatures of PNVC it has been concluded that rotational eclipsing in isotactic NVC sequences is very much more favourable than in corresponding syndiotactic sequences. This contusion is strongly supported by examination of space filling molecular models. Such considerations must be borne in mind when considering the optical and chiroptical properties of carbazole containing polymers and it has to be expected that copolymers of NVC will have fluorescence emission properties that can be related to both main chain tacticity and distribution of monomeric units. Free radically polymerized mixtures of NVC and acrylic derivatives of (—)-menthol have fluorescence spectra... 

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