摘要:
A process for preparing cycloalkanone which comprises the steps of (A) contacting cycloalkane with molecular oxygen in the presence of an oxidation catalyst having an imide moiety represented by formula (I) wherein X represents an oxygen atom or a hydroxyl group (oxidation apparatus 2), (B) separating the catalyst, a by-produced acid component and derivatives thereof from the resulting reaction mixture (filter 3, extraction column 4, hydrolyzing apparatus 7 and sponification apparatus 8), and (C) separating cycloalkane, cycloalkanol and cycloalkanone from the reaction mixture (distillation columns 5, 6, 9 and 10). Also disclosed is a process comprising separating a first component containing cycloalkane (low boiling point component) and a second component containing cycloalkanone and cycloalkanol (high boiling point component) from the reaction mixture and then separating cycloalkanone and cycloalkanol from the high boiling point component. Such processes can be used for preparing cycloalkanone with high efficiency.
摘要:
Activation oxydante de liaisons carbone-hydrogène dont l'atome de carbone est à l'état d'hybridation de type sp³ dans un hydrocarbure par action de H₂O₂ sur l'hydrocarbure dans le milieu résultant, à l'état de microémulsion, du mélange de deux microémulsions eau dans hydrocarbure, l'une contenant du peroxyde d'hydrogène, l'autre un sel ou un dérivé oxygéné colloïdal d'un métal de degré d'oxydation multiple et capable de conduire à des oxydes hydratés.
摘要翻译:的碳 - 氢键氧化活化,其中碳原子是在SP <3>型杂交状态在烃,通过H 2 O 2对在混合物中的微滴乳状液状态得到的烃的动作,从混合两种水 在烃微乳液,一种含过氧化氢,其它的盐或多个氧化态和能够产生水合氧化物组成的金属的胶体氧化衍生物。
摘要:
Es war Aufgabe der Erfindung, ausgehend von Epoxiden, ein gegenüber dem Stand der Technik wenig aufwendiges, nur kurze Reaktionszeiten benötigendes und in bezug auf Peroxidbildung risikoloses Verfahren zu finden. Gemäß dem Stand der Technik wird insbesondere mit Diethylether als Lösungsmittel und Magnesiumverbindungen als Katalysator gearbeitet. Die Lösung des Problems bestand in dem Einsatz polarer Lösungsmittel, wie z. B. N,N′-disubstituierten cyclischen Harnstoffen, in Gegenwart von Alkali- oder Erdalkalihalogeniden. Die cyclischen Ketone insbesondere mit 15 bis 17 Kohlenstoffatomen werden als Riechstoffe eingesetzt.
摘要:
A method for purifying a macrocyclic ketone is disclosed which comprises light-irradiating a macrocyclic ketone containing a macrocyclic diketone as an impurity. Preferably, the macrocyclic ketone as light-irradiated is treated with an active charcoal so as to elevate the purity of the resulting macrocyclic ketone. For light-irradiation, the macrocyclic ketone may be in the form of an alcohol solution.
摘要:
Die Erfindung betrifft ein Verfahren zur photokatalytischen akzeptorfreien Dehydrierung von Alkanen und Alkoholen, bei dem ein Alkan oder ein Alkohol in Gegenwart einer Rhodiumkomplexverbindung, die organische Phosphor(III)-Verbindungen als Liganden enthält, als Katalysator, sowie in Gegenwart von mindestens einer Lewis Base, bestrahlt wird.
摘要:
Ketones of the formula II where A is optionally alkyl-substituted C 2 -C 12 -alkanediyl, R 1 and R 2 are each, independently of one another, C 1 -C 6 -alkyl, or R 1 and R 2 together form optionally alkyl-substituted C 3 -C 10 -alkanediyl, and R 3 is hydrogen or C 1 -C 6 -alkyl, are prepared by reacting a cyclic olefin of the formula I with dinitrogen monoxide to form the ketone of the formula II. The ketone of the formula II can be further hydrogenated to form the saturated ketone of the formula III. Macrocyclic ketones of the formula III, e.g. muscone, are sought after as fragrances.
摘要:
By intramolecular condensation reaction of 2,15-hexadecanedione in a gaseous phase with a compound of a Group II element of the Periodic Table as a catalyst, 3-methyl-cyclopentadecenones is generated. Magnesium oxide, calcium oxide, or zinc oxide is desirable as the catalyst for the intramolecular condensation reaction. (R)- and (S)-muscone is generated by subjecting 3-methyl-cyclopentadecenones obtained as above to hydrogenation by using a catalyst. Palladium catalyst is desirable as the hydrogenation catalyst. Optically active muscone is generated by separating 3-methyl-cyclopentadecenones into respective components thereof by means of precision distillation and subsequently subjecting the separated 3-methyl-cyclopentadecenones to asymmetric hydrogenation by using an optically active ruthenium complex catalyst. The production methods described above enable easy and economical production of 3-methyl-cyclopentadecenones, (R)-and (S)-muscone, and optically active muscone.