摘要:
Providing a catalytic process for preparing 1,4-diketone compounds from furanic compounds and their precursors in a liquid medium, using an acid catalytic system and optionally in the presence of hydrogen and a hydrogenation catalyst, wherein the acidic catalytic system comprises a solid acid catalyst or a mixture of water and CO2.
摘要:
The invention relates to novel therapeutic compounds, more in particular to biologically active analogs and uses thereof as medicament, for instance for the treatment of atrial fibrillation. Provided is a compound of the general formula (formula I) wherein R1 is H or a saturated or unsaturated aliphatic moiety comprising 1 to 8 C-atoms; and X is selected from the group consisting of moieties X1, X2, X3, X4, X5 and X6. Exemplary uses include the prevention or therapeutic treatment of a HSF1-mediated disease.
摘要:
Benzylidene substituted 2,4-pentanedione compounds without having phenolic hydroxyl group(s) are found to provide photostability to otherwise photosensitive compounds and compositions.
摘要:
The invention relates to a method for the production of trioxime derivatives of formula (I): where R?1 and R2¿ = independently, cyano, alkyl, haloalkyl or cycloalkyl and R?3 and R4¿ = independently, alkyl, haloalkyl, cycloalkyl, alkylcarbonyl or arylalkyl. Said method comprises the following reaction steps, without isolation of the intermediate products: A) nitrosation of 1,3 diketones of formula (II), to give monooximes of formula (III): B) oximation of (III) with hydroxylamine derivatives of formula (IV): H¿2N-OR?3', where R3' = H or R3 to give bisoximes of formula (V): C) alkylation of (V) with alkylating agents, or acylation of (V) with acylating agents to give compounds of formula (VI) and D) finally, oximation of (VI) with hydroxylamine to give compounds of formula (I).
摘要:
The condensation reaction of a ketone with either an ester or a carbonate to form, respectively, a 1,3-diketone or a β-ketoester often affords poor results under the standard condensation reaction conditions. High yields and high purities of the desired product can be obtained by performing the reaction using an alkoxide base in DMSO as the sole solvent.
摘要:
A process for recovery of copper from an aqueous ammoniacal solution containing copper values comprising:
(A) contacting a copper pregnant aqueous ammoniacal solution containing copper values with a water insoluble beta-diketone copper extractant dissolved in a water-immiscible organic solvent to extract copper values from said aqueous ammoniacal solution into said organic solution thereby forming a copper pregnant organic phase and a copper depleted aqueous phase; (B) separating said aqueous phase and said organic phase; (C) contacting the copper pregnant organic phase with an aqueous acidic stripping solution; (D) separating said aqueous acidic stripping solution now containing the copper values from the organic phase; and (E) recovering the copper from said aqueous acidic stripping solution; characterized in that the beta-diketone extractant being a highly sterically hindered beta-diketone selected from beta-diketones of formula II: where R is phenyl or alkyl substituted phenyl, R' is alkyl having from above 1 to 8 carbon atoms, and R", R"' and R"" are the same or different and are chosen from the group consisting of H, alkyl having from 1 to 8 carbon atoms, and aralkyl having from 7 to 14 carbon atoms, with the proviso that (a) less than two of R", R"' and R"" are H and (b) the total number of carbons in all R groups is at least 13.
摘要:
Procédé de préparation de composés α,β-dicarbonylés acycliques de formule (I) dans laquelle R 2 = alkyl, phényl ou benzyl pouvant être diversement substitué sur le cycle, ou ester carboxylique et R 3 = alkyl, ou alkoxy ou ester carboxylique dans lequel on fait réagir dans un solvant de type nitrile un composé de formule (II) dans laquelle R 1 = alkyl, ou α-cétocarboxylate d'alkyle ou ester carboxylique et R 2 et R 3 ont les mêmes significations que précédemment, avec de l'oxygène moléculaire en présence de nitrate de cuivre II ou de chlorure ferrique comme catalyseur et application à l'obtention de l'α-cétobutyrate d'éthyle, du phénylpyruvate d'éthyle, du pyruvate d'éthyle, du phénylglyoxylate d'éthyle, de la butane-2,3-dione ou du mésoxalate de diéthyle.