Abstract: Compounds of the formula 1 wherein, R is hydrogen, alkyl or substituted alkyl, aryl or substituted aryl, are useful intermediates in the synthesis of fragrance ingredients such as Ambrox 2

Abstract: A process of converting a carbon-carbon multiple bond to a cyclopropane ring, comprising the addition of a N-alkyl-N-nitroso compound to a mixture of alkene precursor, aqueous base and Pd(II)-catalyst, with the N-alkyl-N-nitroso compound obtained directly from an alkyl amine derivative, NaNO2 and an acid via phase separation of the N-alkyl-N-nitroso compound from the aqueous phase.

Abstract: Compounds of the formula 1 wherein, R is hydrogen, alkyl or substituted alkyl, aryl or substituted aryl, are useful intermediates in the synthesis of fragrance ingredients such as Ambrox 2

Abstract: A process for the hydrogenation of a substrate comprising a carbon heteroatom double bond in the presence of a transition metal complex comprising a tridentate or bisdentate-ligand containing a nitrogen, sulphur and phosphorus atom, of which at least the N- and P- and optionally also the S-atom coordinates with the transition metal.

Abstract: Compounds of the formula 1 wherein, R is hydrogen, alkyl or substituted alkyl, aryl or substituted aryl, are useful intermediates in the synthesis of fragrance ingredients such as Ambrox 2

Abstract: Compounds of the formula 1 wherein, R is hydrogen, alkyl or substituted alkyl, aryl or substituted aryl, are useful intermediates in the synthesis of fragrance ingredients such as Ambrox 2

Abstract: Compounds of the formula 1 wherein, R is hydrogen, alkyl or substituted alkyl, aryl or substituted aryl, are useful intermediates in the synthesis of fragrance ingredients such as Ambrox 2

Abstract: Compounds of the formula 1 wherein, R is hydrogen, alkyl or substituted alkyl, aryl or substituted aryl are useful intermediates in the synthesis of fragrance ingredients such as Ambrox 2.

Abstract: Compounds of the formula 1 wherein, R is hydrogen, alkyl or substituted alkyl, aryl or substituted aryl are useful intermediates in the synthesis of fragrance ingredients such as Ambrox 2.

Abstract: A process for the preparation of ?,?-unsaturated-?, ?-disubstituted esters 1 with high E/Z- and ?,?/?,?-ratios, Formula (1) by reacting at a temperature of between about 130 and 170 degrees centigrade the conjugated malonate Formula (3) with, a group I, II or III metal halide or an organic cation/halide anion pair, an inorganic proton source and a polar solvent.

Abstract: A method for the preparation of cyclopropyl carbinols by cyclopropanation of unsaturated alcoholates, utilizing a reagent system selected from (A) magnesium metal and dibromomethane, and (B) dibromomethane and a tertiary Grignard reagent, the reaction being carried out in the presence of an ether solvent. The process is useful, for example, for the preparation of ingredients for the flavor and fragrance industry.

Abstract: A process for the preparation of ?,?-unsaturated-?,?-disubstituted esters 1 with high E/Z- and ?,?/?,?-ratios, Formula (1) by reacting at a temperature of between about 130 and 170 degrees centigrade the conjugated malonate Formula (3) with, a group I, II or III metal halide or an organic cation/halide anion pair, an inorganic proton source and a polar solvent.

Abstract: A method for the preparation of cyclopropyl carbinols by cyclopropanation of unsaturated alcoholates, utilising a reagent system selected from (A) magnesium metal and dibromomethane, and (B) dibromomethane and a tertiary Grignard reagent, the reaction being carried out in the presence of an ether solvent. The process is useful, for example, for the preparation of ingredients for the flavour and fragrance industry.

Abstract: A process for the cyclopropanation of a substituted alkene, comprising the reaction of the alkene with a carbenoide, generated from dibromomethane and a tri-(C2-C8)-alkyl aluminium compound, in the presence of a catalytic amount of a metal compound selected from the group consisting of Lewis acids, metallocenes and metal carbonyl complexes. The process advantageously uses transition metal compounds as catalysts and the dibromomethane can be recovered. The process is especially useful for the preparation of ingredients for the flavour and fragrance industry.

Abstract: A process of preparation of cis-2-acetyl-1,2,3,4,5,6,7,8-octahydro-1,2,8,8-tetramethylnaphthalene (“?-Georgywood”) from cis-1-[1,2-dimethyl-4(4-methyl-pent-3-enyl)-cyclohex-3-enyl]-ethanone (“?-Georgywood”), comprising the reaction of ?-Georgywood with more than one molar equivalent of a Lewis acid. The method allows the preparation of isomeric mixtures that contain a much higher proportion of the olfactorily-desirable ?-Georgywood than was previously possible.

Abstract: A process for the cyclopropanation of a substituted alkene, comprising the reaction of the alkene with a carbenoide, generated from dibromomethane and a tri-(C2-C8)-alkyl aluminium compound, in the presence of a catalytic amount of a metal compound selected from the group consisting of Lewis acids, metallocenes and metal carbonyl complexes. The process advantageously uses transition metal compounds as catalysts and the dibromomethane can be recovered. The process is especially useful for the preparation of ingredients for the flavour and fragrance industry.

Abstract: Inhibitors of axillary malodour having the formula wherein R has the same meaning as given in the specification.

Abstract: A process of preparation of cis-2-acetyl-1,2,3,4,5,6,7,8-octahydro-1,2,8,8-tetramethylnaphthalene (“?-Georgywood”) from cis-1-[1,2-dimethyl-4(4-methyl-pent-3-enyl)-cyclohex-3-enyl]-ethanone (“?-Georgywood”), comprising the reaction of ?-Georgywood with more than one molar equivalent of a Lewis acid. The method allows the preparation of isomeric mixtures that contain a much higher proportion of the olfactorily-desirable ?-Georgywood than was previously possible.

Abstract: The compound 5-(2,2-dimethyl-cyclopropyl)-3-methyl-pent-2-enenitrile and its use in fragrance or flavour applications.

Abstract: A process of preparing methylaluminium dichloride by (i) reacting by heating a material of the formula R3Al2X3, where R is C1-C4 alkyl and X is selected from bromine and iodine with an aluminium-containing material selected from metallic aluminium and a mixture of metallic aluminium and aluminium trichloride in an atmosphere of methyl chloride, with the proviso that when R is methyl and X is iodine, the aluminium-containing material is a mixture of aluminium and aluminium trichloride; and (ii) when the aluminium-containing material is metallic aluminium, adding aluminium trichloride to this reaction mixture and heating, to give a crude reaction product; and (iii) if desired, obtaining methylaluminium dichloride from this crude reaction product. The crude reaction product may be used directly in organic syntheses, such as the cyclisation of ?-Georgywood to give ?-Georgywood.