- Process for making intermediates for fragrance components from α-campholenic aldehyde
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A two-step aldol condensation process is disclosed. α-Campholenic aldehyde (ACA) and methyl ethyl ketone (MEK) react in the presence of a base under conditions effective to produce a mixture comprising a high yield of ketol condensation products. Dehydration of the ketols in the presence of an organic sulfonic acid provides unsaturated ketones that are valuable intermediates for fragrance components for synthetic sandalwood products. Compared with the usual one-step, base-catalyzed approach, the two-step process increases the yield of all condensation products and maximizes production of the most valuable ketone isomers.
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Page/Page column 6-7
(2008/06/13)
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- Precursors for fragrant ketones and fragrant aldehydes
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The present invention refers to fragrance precursors of formula I for a fragrant ketone of formula II and one or more fragrant aldehydes or ketones of formula III and IV, These fragrance precursors are useful in perfumery, especially in the fine and functional perfumery.
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- Ketone precursors for organoleptic compounds
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The invention discloses ketones of formula I: wherein, Y is an optionally substituted alkyl, cycloalkyl, or cycloalkylalkyl, wherein each alkyl group is straight or branched and each alkyl and cycloalkyl group is saturated or unsaturated; R1is hydrogen or a C1-6alkyl group that is substituted, saturated or unsaturated, straight or branched; A is a chromophoric substituted aromatic ring or ring system; n is an integer; and with the proviso that formula I is not 2-ethoxy-1-phenyl-ethanone. These compositions are useful for the delivery of organoleptic compounds, especially of flavors, fragrances, masking agents and antimicrobial compounds.
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- Hydroxylic campholenic aldehyde derivatives, their utilization as perfume ingredients and perfuming compositions containing same
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Novel compounds of formula STR1 wherein: a. R1 =CH3 ; n=m=1; R2 =CH3 ; R3 =R4 =H, b. R1 =CH2 ; n=0; m=1; R2 =CH3 ;R3 =R4 =H, C. R1 =CH--CH3 ; n=0; m=1; R2 =CH3 ; R3 =R4 =H, d. R1 =H; n=m=0; R2 =R4 =CH3 ; R3 =C2 H5, e. R1 =H; n=m=0; R2 =R3 =R4 =CH3, f. R1 =H; n=m=0; R2 =CH3 ; R3 =C2 H5 ; R4 =H, g. R1 =H; n=m=0; R2 =R3 =CH3 ; R4 =H, h. R1 =H; n=m=1; R2 =CH3 ; R3 =C2 H5 ; R4 =H i. R1 =H; n=m=1; R2 =R3 =CH3 ; R4 =H and wherein one of the dotted lines stands for a single carbon-carbon bond and the other one for a double bond, or each of them designates a single bond, possess odorous properties of sandalwood type and consequently can find a utility for the preparation of perfumes and perfumed products.
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