- PROCESS OF PRODUCTION OF 1-(5,5-DIMETHYLCYCLOHEX-1-EN-1-YL)ETHANONE AND 1-(5,5-DIMETHYLCYCLOHEX-6-EN-1-YL)ETHANONE
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The present invention relates to an improved method for producing of 1-(5,5- dimethylcyclohex-1-en-1-yl)ethanone and 1-(5,5-dimethylcyclohex-6-en-1- yl)ethanone.
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Page/Page column 15
(2015/12/08)
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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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- CYCLIZATION OF ACYCLIC ISOPRENOIDS. IV. RING CLOSURE WITH FORMATION OF A C2-OXYGEN BOND
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Experimentally substantiated schemes are proposed for the first time for the cyclization of a series of the most important representatives of acyclic isoprenoids (citral, diisopentenylacetone, dehydrolinalool), and the intermediate carbocations were detected by NMR.In all cases the proton adds at the 2,3-double bond, and cyclization takes place by reaction of the C2 cationic center with the oxygen of the carbonyl or hydroxyl group.The cyclization of the structural analog of citral (citronellal) takes place in a different way.In this case the 2,3-double bond acts as internal nucleophile.The great synthetic possibilities of the cyclization of acyclic isoprenoids in superacids in comparison with the conditions of acid catalysis are demonstrated.
- Gavrilyuk, O. A.,Korchagina, D. V.,Osadchii, S. A.,Barkhash, V. A.
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p. 871 - 885
(2007/10/02)
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- Friedel-Crafts Reactions of Some Vinyisilanes
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Substituted cyclohexenylsilanes (2), (5), (9), and (13) undergo Friedel-Crafts reactions to give substitution products, site-selectively at the carbon atom carrying the trimethylsilyl group. β-Trimethylsilylstyrene (17) similary gives more substitution in Friedel-Crafts reactions with benzoyl chloride and with phenylacetyl chloride than styrene itself.The syntheses of the silanes are reported, and some limitations of the idea identified.
- Fleming, Ian,Pearce, Andrew
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p. 2485 - 2489
(2007/10/02)
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