Firmenich Sa

Jean-Paul Leresche

Yves Mentha

Hubert Mimoun

Koenraad Vanhessche

Robert Clark McIver

Bessaa Neffah

Alexander Zaslona

Koenraad P Vanhessche

The present invention relates to the field of perfumery. More particularly, it concerns a process for the preparation of 2-methyl-4-phenyl-2-butanol, or even 4-cyclohexyl-2-methyl-2-butanol from 4,4-dimethyl-2,6-diphenyl-1,3-dioxane.

Process for producing 4-cyclohexyl-2-methyl-2-butanol

The invention relates to a continuous process for the preparation of a flavor or fragrance delivery system, wherein the presence of two heat exchangers operating respectively an evaporation and cooling step, allow to optimize the quality and yield of the final product.

Continuous process for the incorporation of a flavor or fragrance ingredient or composition into a carbohydrate matrix

Oxygen-containing aliphatic compounds and their use as intermediates for

1,1,2,3,4,4,6-Heptamethyl-1,2,3,4-tetrahydronaphthalene, a novel naphthalenic compound, is useful as an intermediate for the preparation of 5,6,7,8-tetrahydro-3,5,5,6,7,8,8-heptamethyl-2-naphthalenecarbaldehyde. It is prepared by a process consisting of the addition of an olefin of formula ##STR1## wherein R.sup.1 and R.sup.2 represent different substituents and each defines a hydrogen atom or a methyl radical, with p-cymene. 4,4-Dimethyl-2-pentene [compound (III): R.sup.1 =CH.sub.3 ; R.sup.2 =H] is obtained by the co-metathesis reaction of an olefin of formula ##STR2## wherein R.sup.1 and R.sup.2 represent identical substituents designating each a hydrogen atom or a methyl radical, with an olefin of formula ##STR3## wherein R.sup.3 and R.sup.4 identical or different, designate each a hydrogen atom or a methyl radical in the presence of an appropriate catalyst consisting of Re.sub.2 O.sub.7 on an inert solid carrier, or of WCl.sub.6 /(C.sub.2 H.sub.5))/Bu.sub.4 Sn.

Naphthalenic compound and process for its preparation

Process for the preparation of 4,4-dimethyl-2-pentene

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Preverenges, Switzerland

Jean-Paul Leresche