摘要:
The present invention relates to a process for purifying a crude composition including a monoterpene compound selected from the group consisting of monocyclic monoterpene alcohols, monocyclic monoterpene ketones, bicyclic epoxy monoterpenes and mixtures of two or more of the aforementioned compounds, such as preferably a monocyclic monoterpene alcohol, wherein the process comprises the step of performing a layer crystallization with a melt of the crude composition, and wherein the melt of the crude composition, which is subjected to the layer crystallization, includes oxygen-containing solvent in a concentration of 20 ppm to 2 % by weight, wherein the oxygen-containing solvent is selected from the group consisting of water, C 1 - 6 -alcohols, C 1-6 -carboxylic acids, C 1-6 -ketones, C 1-6 -aldehydes, C 1-12 -ethers, C 1-12 -esters and mixtures of two or more of the aforementioned solvents.
摘要:
Compositions that include compounds capable of producing a cooling sensory effect such as certain hydroxy-ketones and hydroxy-aldehyde compounds, their cyclic semi-ketals and semiacetals, and other derivatives thereof. The compounds impart a refreshing and cooling sensation of long duration and high potency, and thus are useful in a variety of formulations, including consumer products such as mouth formulations, food and beverage products, tobacco and smoking articles, fragrances, toiletries, oinments, and the like.
摘要:
The present invention relates to a cycloalkanone composition which contains cycloalkanone (1) in an amount of 70 wt% or more based on the composition, wherein the content of a dimer of a cycloalkanone represented by formula (2) is 0.055 or less in terms of weight ratio to the cycloalkanone (1), a process for producing the same, a process for producing a composition containing alkyl acetate (5) by using the cycloalkanone composition, and an alkyl acetate composition obtained by the process
wherein n is an integer of 1 or 2, R 1 and R 2 each represent H, a C1 to C8 alkyl group etc., and R 3 represents a C1 to C3 alkyl group.
摘要:
Compounds of formulae (I) or (II): wherein R is a substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl, aralkyl aralkenyl, or aralkynyl group, that optionally includes at least one heteroatom in its carbon skeleton, and R1 and R2 are H, or an -OR3 group in which R3 is a substituted or unsubstituted alkyl, alkenyl, alkynyl, aryl, aralkyl aralkenyl, or aralkynyl group containing 4-12 carbon atoms, that optionally includes at least one heteroatom in its carbon skeleton, and R1 and R2 cannot both be H, and their use in therapeutic methods.
摘要:
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-nTi] or [(Cl)n(alkoxy)4-nZr] complex (n being an integer from 1 to 3), and a co-ingredient, such as a carboxylic acid anhydride or an anhydrous salt.