Abstract:
The present application describes a porous polymethylsilsesquioxane (PMS) having a specific surface area between approximately 50 m2/g and 500 m2/g, a pore volume between approximately 0.1 cm3/g and 0.8 cm3/g, a monolayer volume between approximately 10 cm3/g and 60 cm3/g, a pore radius smaller than 1 nm for 90% of the pores and insolubility in water and organic solvents. The PMS according to the invention is prepared by precipitation of a polymethylsiliconate of the general formula in which n is a whole number between approximately 20 and 100 and M is an alkaline metal or alkaline-earth metal or NH4+.
Abstract:
The compounds according to the general formula in which formula the dotted lines indicate a single or a double bond, n and m are 0 or 1, R1 is hydrogen or an acyl group —C(O)R3, R3 being a linear or branched alkyl or alkylene group from C1 to C8, the oxygen atom being bound to the adjacent &agr;-carbon atom by a double bond in the case where n is 0 and by a single bond in the case where n is 1, R2 is hydrogen or a linear or branched alkyl, alkenyl or alkoxy group from C1 to C8, or R2 is an alkenoxy group which is linked to the group R1 to form a 1,3-dioxolane cycle having 5 to 7 ring members, are useful perfuming ingredients. The most preferred compounds according to the invention are those which have a damascone- or damascenone-like structure, with the methyl substituent being in 4-position of the ring instead of the 2-position, as is the case in damascones and damascenones.
Abstract:
Perfuming ingredients which include at least one macrolide of formula ##STR1## having a double bond in one of the positions indicated by the dotted lines and wherein the symbol R represents a hydrogen atom or a methyl radical, are described. They are useful for the preparation of perfumes and perfumed consumer products to which they impart musky odors with original nuances.
Abstract:
Olefins are oxidized to unsaturated esters by means of molecular oxygen in the presence of a carboxylic acid and an organometallic palladium complex containing two identical or different hydroxamate anions or one hydroxamate anion and a carboxylate anion, said complex acting as catalyst.
Abstract:
Carbonyl compounds are manufactured by oxidizing alcohols or polyalcohols with molecular oxygen in the presence of a catalyst which comprises ruthenium salts or complexes associated with copper or iron salts or complexes.
Abstract:
Process for manufacturing solid catalysts, useful for oxidizing olefins containing from 2 to 16 carbon atoms per molecule to the corresponding carbonyl derivatives, comprising the step of impregnating a carrier with a substantially non-aqueous solution, containing at least two components [A] and [B] of the general formulas:[A]=M.sub.1 X.sub.n L.sub.m[B]=M.sub.2 Z.sub.p L'.sub.qwherein M.sub.1 is rhodium or palladium, X and Z are each an anionic group, n and p are integers selected from 1, 2 and 3, m being an integer selected from 1, 2, 3 and 6 or being O, M.sub.2 is a metal selected from iron, copper, manganese and cobalt, q is an integer selected from 1 to 6 or is equal to O and L and L' are each a coordinate selected from water or an organic compound, said impregnation being conducted in the presence of at least one halogen, a halohydric acid or an organic or inorganic halide.
Abstract:
Catalytic oxidation of hydrogen sulfide to sulfur in homogeneous liquid phase, by means of molecular oxygen, in an organic solvent whose water content is lower than 60% by volume, said liquid phase comprising a solvent selected from amides, phosphoramides, sulfoxides, nitriles and ethers, said oxidation being conducted in the presence of at least one catalyst selected from the two following categories:A. a chelate of a transition metal selected from the group of metals consisting of iron, manganese, copper and cobalt, the chelate being selected from the group consisting of dialkyldithiocarbamates, alkylxanthates, dithiolates, 8-hydroxyquinolinates and salicylaldimines,B. a salt of said transition metal of the formula MX.sub.m in which M is the transition metal, X is an anion selected from the group consisting of Cl.sup.-, Br.sup.-, ClO.sub.4.sup.-, NO.sub.3.sup.- and SCN.sup.- and m is 2 or 3.
Abstract:
The present invention relates to a preparation of β-γ ene carboxylic or ketone derivatives, which may also have particular requirement on the configuration of the carbon-carbon double bond. The method requires a thermal treatment of α-β unsaturated malonate or acetylacetonate derivatives in the presents of at least one carboxylic acid and at least one alkaline, alkaline-earth or lanthanide halide or carboxylates.
Abstract:
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.
Abstract:
The present invention discloses perfuming ingredients, which are unsaturated esters of sorbol, as well as the use of such compounds in the perfumery industry and in compositions or articles containing such compounds.