摘要:
A process for the preparation of β,γ-unsaturated-γ, γ-disubstituted esters 1 with high E/Z- and β,γ/α,β-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.
摘要:
A process for the preparation of β,γ-unsaturated-γ,γ-disubstituted esters 1 with high E/Z- and β,γ/α,β-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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
A process for preparing a compound of formula I wherein R1 and R2 are independently selected from the group consisting of hydrogen, lower alkyl and halogen
摘要:
A process of preparation of cis-2-acetyl-1,2,3,4,5,6,7,8-octahydro-1,2,8,8-tetramethylnaphthalene (“β-Georgywood”) from cis-1-[1,2-dimethyl-4(4-methyl-pent-3-enyl)-cyclohex-3-enyl]-ethanone (“Ψ-Georgywood”), comprising the reaction of Ψ-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 β-Georgywood than was previously possible.