摘要:
A method for preparing 3-oxo-2-pentyl-1-cyclopentaneacetic acid or methyl 3-oxo-2-pentyl-1-cyclopentaneacetate, essentially in the form of the (+)-(1R)-cis isomer thereof. The method includes the steps of (a) catalytically hydrogenating a compound of the formula (I), ##STR1## wherein M is a hydrogen atom, an alkali metal or alkaline earth metal atom, or a group NR.sub.4, where R is a hydrogen or a lower alkyl radical, in a suitable solvent and in the presence of a catalyst consisting of an Ru(II) complex comprising chiral ligands that contain a 2,2'-bis(diphenylphosphino)-1,1'-dinaphthyl (BINAP) radical or a 1,2-bis(2,5-dialkylphospholano)benzyl (DuPHOS) radical, wherein the alkyl is a C.sub.2 or C.sub.3 radical, to give a compound of formula (II), ##STR2## wherein M has the meaning given above, essentially in the form of the (+)-(1R)-cis isomer thereof; (b) if required, acidifying, in a per se known manner, the compound of formula (II), wherein M is an alkali metal or alkaline earth metal atom, or a group N.sub.4, where R is hydrogen or a lower alkyl radical, to give (+)-(1R)-cis-3-oxo-2-pentyl-1-cyclopentaneacetic acid; and (c) if required, esterifying the resulting (+)-(1R)-cis-3-oxo-2-pentyl-1-cyclopentaneacetic acid under suitable conditions to form methyl (+)-(1R)-cis-3-oxo-2-pentyl-1-cyclopentaneacetate.
摘要:
Process for the preparation of .gamma.,.delta.-unsaturated carboxylate esters which comprises reacting an .alpha.,.beta.-unsaturated alcohol with a trialkyl orthopropionate in the presence of an organic acid having pk.sub.a of about 7 to 9.Among the thus obtained .gamma.,.delta.-unsaturated carboxylate esters, 2,5,9-trimethyl-deca-3,4,8-triene-carboxylates and 2-methyl-3-[2-methyl-5-isopropenyl-cyclopent-1-en-1-yl]-propionates are particularly useful as intermediates for the preparation of perfuming ingredients.
摘要:
The catalysts of formula (II): [Ru(L)m(L′)wXY], wherein X and Y represent simultaneously or independently a hydrogen or halogen atom, a hydroxy group, or an alkoxy, carboxyl or other anionic radical, m is 1 or 2, w is 1 when m is 1 and w is 0 when m is 2, L is a phosphino-amine or phosphino-imine bidentate ligand and L′ a diphosphine, are useful for the hydrogenation of substrates having a carbon-hetero atom double bond.
摘要:
The catalysts of formula (II): [Ru(L)m(L′)wXY], wherein X and Y represent simultaneously or independently a hydrogen or halogen atom, a hydroxy group, or an alkoxy, carboxyl or other anionic radical, m is 1 or 2, w is 1 when m is 1 and w is 0 when m is 2, L is a phosphino-amine or phosphino-imine bidentate ligand and L′ a diphosphine, are useful for the hydrogenation of substrates having a carbon-hetero atom double bond.
摘要:
The present invention discloses a process for the preparation of a compound according to formula wherein R1 is a C3-C7 alkyl group and R2 is a C1 to C4, linear or branched, alkyl radical, more preferably a methyl group, characterized in that the process includes the isomerisation of an epoxide of formula wherein R1 and R2 have the meaning given in formula (I), in the presence of an acidic isomerisation agent, a thermal treatment or a combination thereof. The process according to the invention allows the preparation of the cyclopentenyl compounds of formula (I) on an industrial scale. The compounds are important starting products for the production of appreciated perfuming ingredients in particular methyl dihydrojasmonates.
摘要:
Catalysts of formula [Ru(L)m(L′)wXY] (II) wherein X and Y represent simultaneously or independently a hydrogen or halogen atom, a hydroxy group, or an alkoxy, carboxyl or other anionic radical, m is 1 or 2, w is 1 when m is 1 and w is 0 when m is 2, L is a phosphino-amine or phosphino-imine bidentate ligand and L′ a diphosphine, are useful for the hydrogenation of substrates having a carbon-hetero atom double bond.
摘要:
Catalysts of formula [Ru(L)m(L′)wXY] (II) wherein X and Y represent simultaneously or independently a hydrogen or halogen atom, a hydroxy group, or an alkoxy, carboxyl or other anionic radical, m is 1 or 2, w is 1 when m is 1 and w is 0 when m is 2, L is a phosphino-amine or phosphino-imine bidentate ligand and L′ a diphosphine, are useful for the hydrogenation of substrates having a carbon-hetero atom double bond.
摘要:
Cyclopentenones of formula ##STR1## wherein each of symbols R.sup.1 and R.sup.2, when taken separately, represents an alkyl radical of C.sub.1 to C.sub.6, or a hydrogen atom, or, when taken together, they represent a polymethylene, or one of them designates a hydrogen atom and the other an alkyl radical of C.sub.1 to C.sub.6, are prepared starting from compounds having formula ##STR2## wherein R stands for a C.sub.1 to C.sub.6 alkyl radical or a phenyl group, via a catalytic reaction promoted by a metallo-organic compound of formulaMeX.sub.2 (R.sup.3 CN).sub.2 (III)wherein Me represents palladium or platinum, R.sup.3 represents a C.sub.1 to C.sub.3 alkyl radical or a phenyl group and X defines a halogen atom.
摘要:
Process for the preparation of unsaturated cycloaliphatic ketones useful as perfuming and odour-modifying agents in the manufacture of perfumes and perfumed products, and as flavouring and taste-modifying agents in the aromatization of foodstuffs in general and imitation flavours for foodstuffs, beverages, animal feeds, pharmaceutical preparations and tobacco products.Compositions of matter relating to some of said unsaturated cycloaliphatic ketones which are new, and perfume- and flavouring compositions containing same.
摘要:
The invention relates to a method of use of certain derivatives of formula (I) in the form of any one of its stereoisomers or a mixture thereof, and wherein R1 represents a hydrogen atom, a C1-4 alkyl or alkenyl group, or a (CHR)2OH group, each R being a hydrogen atom or a methyl group; R2 represents a hydrogen atom or a methyl, ethyl or n-propyl group; and R3 represents a hydrogen atom or a methyl group, as perfuming ingredients. The present invention concerns also certain compounds and compositions or articles containing such compounds.