Abstract:
The present invention relates to a process for the preparation of β-ionones and/or α-ionones of the formulae (II) and (III) by acid catalyzed ring-closing of ψ-ionones of the formula (I) wherein R 1 to R 7 are independently selected from hydrogen and C 1 -C 4 -alkyl, R 8 is selected from hydrogen and C 1 -C 4 -alkyl and the hydroxyl group, R 9 and R 10 are independently selected from hydrogen and C 1 -C 4 -alkyl or R 9 and R 10 form together the oxygen of a carbonyl group, whereby if R 9 and R 10 form together the oxygen of a carbonyl group no α-isomer is formed comprising: a) reacting a ψ-ionone according to formula (I) in presence of a concentrated Brønsted-acid having a pKs
Abstract:
The present invention relates to a process for the carbon-carbon double bond isomerisation of a 2-alkyl-cyclohex-3-enyl alkyl or alkenyl ketone into a mixture comprising the corresponding 2-alkyl-cyclohex-2-enyl ketones and the corresponding 2-alkylene-cyclohexyl ketones, using as catalyst a ruthenium complex obtainable by the reaction of an appropriate ruthenium organometallic precursor and an acid.
Abstract:
Kontinuierliches Verfahren zur Herstellung von Pseudojononen der allgemeinen Formeln (I) bzw. (I′) sowie ihrer Isomeren siehe Papierexemplarbzw.siehe Papierexemplar wobei R1 siehe Papierexemplarbedeutet, R2, R3 Wasserstoff, CH3 oder C2H5 bedeuten, R4, R5 Wasserstoff oder CH3 bedeuten, durch Umsetzen eines Aldehyds der Formel (II),siehe Papierexemplarmit einem Überschuss eines Ketons der allgemeinen Formel (III)siehe Papierexemplar wobei R1, R2 und R3 die oben angegebenen Bedeutungen besitzen, in Gegenwart von Wasser und Alkalihydroxid bei erhöhter Temperatur in homogener Lösung, dadurch gekennzeichnet, dass a) die Durchmischung der homogenen Lösung von Aldehyd, Keton und wässriger Alkalilauge bei einer Temperatur von 10 bis 120°C stattfindet, dannb) das nicht im Reaktionsgemisch gelöste Wasser und Alkalihydroxid abgetrennt werden,c) anschließend das homogene Reaktionsgemisch unter Vermeidung von Rückvermischung bei einer Temperatur, die 10 bis 120°C oberhalb des Siedepunktes der am niedrigsten siedenden Komponente und einem Dampfdruck p von 106 bis 107 Pa durch einen Reaktor geleitet wird, der eine Verweilzeit von 2 bis 300 Minuten ermöglicht, d) das Reaktionsgemisch unter Entspannung abgekühlt wird,e) Keton mit Dampf im Gegenstrom aus dem Reaktionsgemisch entfernt wird undf) das Rohprodukt getrocknet und über eine Rektifikationskolonne von überschüssigem Aldehyd und Nebenkomponenten befreit wird
Abstract:
The invention relates to a process for the preparation, in a single step, of enones by an aldol condensation of a ketone, such as a gem-dimethyl cyclohexylethanone or gem-dimethyl cyclohexenylethanone derivative, with an aldehyde in the presence of a novel catalytic system and without the pre-formation of an enolate. Said catalytic system consists of a metal complex, such as a [(Cl) n (alkoxy) 4-n Ti] or [(Cl) n (alkoxy) 4-n Zr] complex (n being an integer from 1 to 3), and a co-ingredient, such as a carboxylic acid anhydride or an anhydrous salt.
Abstract:
A process for the preparation of irones by a chemical oxidation of irone precursors, comprising treating an iris rhizome substrate selected from the group consisting of iris rhizomes, parts of such rhizomes, iris extracts, iris extraction wastes, any plant tissues containing precursors of irones and mixtures thereof, is described.
Abstract:
A novel perfume composition containing an effective amount of ( 9E)-cis-gamma-irone (formula (B)), which has not been heretofore applied in the field of perfumery, in perfumes or flavored articles, a method for imparting, changing or enhancing aromatic properties by compounding ( 9E)-cis-gamma-irone with perfumes or articles being flavored, and a novel process for preparing ( 9E)-cis-gamma-irone.
Abstract:
The present invention relates to a process for preparing 1-(2,6,6-trimethylcyclohex-2- en-1-yl)but-2-en-1-one, which comprises a) providing 6,10-dimethylundeca-1,5,9-trien-4-ol, b) oxidizing 6,10-dimethylundeca-1,5,9-trien-4-ol provided in step a) with an oxidizing agent in the presence of at least one organic nitroxyl radical, at least one nitrate compound and an inorganic solid to yield 6,10-dimethylundeca-1,5,9- trien-4-one, c) reacting the 6,10-dimethylundeca-1,5,9-trien-4-one obtained in step b) with an acid to yield 1-(2,6,6-trimethylcyclohex-2-en-1-yl)but-2-en-1-one.
Abstract:
The present invention relates to process for the maintaining of a ratio stereoisomers of carotenoid compounds by using at least one alkali and/or earth alkali metal salt of an organic acid, to specific formulations and to the use of such specific formulations.
Abstract:
The present invention concerns a compound of formula (I), in the form of any one of its stereoisomers or a mixture thereof, and wherein the dotted line represents a carbon-carbon single or double bond; as well as its use as perfuming ingredient.
Abstract:
The present disclosure describes processes for the epimerization of a cyclohexene comprising the steps of providing to a reactor a first isomer of a 1-(2-alkyl-3-cyclohexen-1-yl)-alkanone compound according to Formula I I wherein R1 ad R2 are each independently C1-C4 alkyl, and R3, R4, R5, R6, R7, and R8 are each independently selected from the group consisting of H and C1-C4 alkyl; and epimerizing the first isomer of the 1-(2-alkyl-3-cyclohexen-1-yl)-alkanone with a metal alkoxide base to form a second isomer of the 1-(2-alkyl-3-cyclohexen-1-yl)-alkanone.